| complete coding genome sequence for mogiana tick virus, a jingmenvirus isolated from ticks in brazil. | mogiana tick virus (mgtv) is a segmented jingmenvirus isolated in 2011 from cattle ticks in brazil. here, we present a complete coding genome sequence for mgtv isolate mgtv/v4/11, including all four segments. mgtv is evolutionarily related to the jingmen tick virus isolates sy84 and rc27. | 2017 | 28473376 |
| a study of ticks and tick-borne livestock pathogens in pakistan. | as obligate blood-feeding arthropods, ticks transmit pathogens to humans and domestic animals more often than other arthropod vectors. livestock farming plays a vital role in the rural economy of pakistan, and tick infestation causes serious problems with it. however, research on tick species diversity and tick-borne pathogens has rarely been conducted in pakistan. in this study, a systematic investigation of the tick species infesting livestock in different ecological regions of pakistan was co ... | 2017 | 28650978 |
| rickettsia amblyommatis infecting ticks and exposure of domestic dogs to rickettsia spp. in an amazon-cerrado transition region of northeastern brazil. | this study was performed in maranhão state, a transition area two brazilian biomes, amazon and cerrado. during 2011-2013, 1,560 domestic dogs were sampled for collection of serum blood samples and ticks in eight counties (3 within the amazon and 5 within the cerrado). a total of 959 ticks were collected on 150 dogs (9.6%). rhipicephalus sanguineus sensu lato (s.l.) was the most abundant tick (68% of all collected specimens), followed by amblyomma cajennense sensu lato (s.l.) (12.9%), amblyomma p ... | 2017 | 28594882 |
| rhipicephalus microplus and dermacentor nitens (acari: ixodidae) coparasitize white-tailed deer on st. john, u.s. virgin islands. | ticks parasitizing introduced white-tailed deer, odocoileus virginianus (zimmermann), on st. john, u.s. virgin islands, were recorded during and after drought conditions. tick infestation prevalences were 22% at the start of the drought (july 2015), 66% at the height of the drought (march 2016), and 35% after the drought had ended (july 2016; n = 67 deer). samples of ticks from 22 tranquilized deer in july 2016 revealed the presence of two species, the southern cattle tick, rhipicephalus (boophi ... | 2017 | 28591859 |
| the transcription factor relish controls anaplasma marginale infection in the bovine tick rhipicephalus microplus. | rhipicephalus microplus is an important biological vector of anaplasma marginale, the etiological agent of bovine anaplasmosis. the knowledge of tick immune responses to control bacterial infections remains limited. in this study, we demonstrate that transcription factor relish from the imd signaling pathway has an important role in the control of a. marginale infection in ticks. we found that rna-mediated silencing of relish caused a significant increase in the number of a. marginale in the mid ... | 2017 | 28408334 |
| molecular detection of pathogens in ticks infesting cattle in nampula province, mozambique. | ticks are ectoparasites that can act as vectors of a large number of pathogens in wild and domestic animals, pets, and occasionally humans. the global threat of emerging or re-emerging tick-borne diseases supports the need for research focused in the zoonotic transmission, especially in countries like mozambique where rural populations are in close contact with domestic animals. the present study aims to: (1) identify tick species infesting cattle from monapo and nacala porto, districts of nampu ... | 2017 | 28856544 |
| geno- and phenotypic characteristics of a transfected babesia bovis 6-cys-e knockout clonal line. | babesia bovis is an intra-erythrocytic tick-transmitted apicomplexan protozoan parasite. it has a complex lifestyle including asexual replication in the mammalian host and sexual replication occurring in the midgut of host tick vector, typically, rhipicephalus microplus. previous evidence showed that certain b. bovis genes, including members of 6-cys gene family, are differentially expressed during tick and mammalian stages of the parasite's life cycle. moreover, the 6-cys e gene is differential ... | 2017 | 28464956 |
| molecular and pharmacological characterization of the chelicerata pyrokinin receptor from the southern cattle tick, rhipicephalus (boophilus) microplus. | we identified the first pyrokinin receptor (rhimi-pkr) in chelicerata and analyzed structure-activity relationships of cognate ligand neuropeptides and their analogs. based on comparative and phylogenetic analyses, this receptor, which we cloned from larvae of the cattle tick rhipicephalus microplus (acari: ixodidae), is the ortholog of the insect pyrokinin (pk)/pheromone biosynthesis activating neuropeptide (pban)/diapause hormone (dh) neuropeptide family receptor. rhimi-pkr functional analyses ... | 2015 | 25747529 |
| molecular and maldi-tof identification of ticks and tick-associated bacteria in mali. | ticks are considered the second vector of human and animal diseases after mosquitoes. therefore, identification of ticks and associated pathogens is an important step in the management of these vectors. in recent years, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (maldi-tof ms) has been reported as a promising method for the identification of arthropods including ticks. the objective of this study was to improve the conditions for the preparation of tick samples ... | 2017 | 28742123 |
| draft genome sequence of enterococcus casseliflavus pavet15 obtained from the oviduct infection of the cattle tick (rhipicephalus microplus) in jiutepec, morelos, mexico. | enterococcus spp. are gram-positive lactic acid-producing bacteria found in the intestinal tracts of animals, like mammals, birds, and arthropods. enterococcus spp. may cause oportunistic infections in vertebrate and invertebrate hosts. we report here the draft genome sequence of enterococcus casseliflavus pavet15 containing 3,722,480 bp, with 80 contigs, an n50 of 179,476 bp, and 41.93% g+c content. | 2017 | 28428300 |
| spotted fever: epidemiology and vector-rickettsia-host relationship in rio de janeiro state. | the eco-epidemiological scenario of spotted fever (sf), a tick-borne disease that affects humans and other animals in several countries around the world, was analyzed in rio de janeiro (rj) state, brazil. during the last 34 years, 990 sf cases were reported in rj (the brazilian state with the highest population density), including 116 cases confirmed by serology (rifi) or pcr, among 42.39% of the municipalities with reported cases of sf. the epidemiologic dynamics of sf in rj state are very hete ... | 2017 | 28424664 |
| activity of carboxylesterases, glutathione-s-transferase and monooxygenase on rhipicephalus microplus exposed to fluazuron. | the objective of this study was to assess the effect of the exposure to fluazuron on the activity of common pesticide detoxification enzyme groups in the cattle tick (rhipicephalus microplus). engorged females of a susceptible strain (poa) and a resistant strain (jaguar) were exposed in vitro to fluazuron and their eggs and larvae were used to compare the activities of the general esterases, mixed-function oxidases (mfo) and glutathione-s-transferase (gst). the results showed significant elevati ... | 2017 | 28435029 |
| first report of fluazuron resistance in rhipicephalus microplus: a field tick population resistant to six classes of acaricides. | the control of the cattle tick rhipicephalus microplus is based mainly on the use of chemical acaricides, which has contributed to the emerging problem of selection of resistant tick populations. currently, there are six main classes of acaricides commercially available in brazil to control cattle ticks, with fluazuron, a tick growth regulator with acaricidal properties, being the only active ingredient with no previous reports of resistance. ticks (designated the jaguar strain) were collected i ... | 2014 | 24560364 |
| interaction of plant essential oil terpenoids with the southern cattle tick tyramine receptor: a potential biopesticide target. | an outbreak of the southern cattle tick, rhipicephalus (boophilus) microplus, (canestrini), in the united states would have devastating consequences on the cattle industry. tick populations have developed resistance to current acaricides, highlighting the need to identify new biochemical targets along with new chemistry. furthermore, acaricide resistance could further hamper control of tick populations during an outbreak. botanically-based compounds may provide a safe alternative for efficacious ... | 0 | 27986436 |
| acaricidal efficacies of lippia gracilis essential oil and its phytochemicals against organophosphate-resistant and susceptible strains of rhipicephalus (boophilus) microplus. | plant-derived natural products can serve as an alternative to synthetic compounds for control of ticks of veterinary and medical importance. lippia gracilis is an aromatic plant that produces essential oil with high content of carvacrol and thymol monoterpenes. these monoterpenes have high acaricidal activity against rhipicephalus (boophilus) microplus. however, there are no studies that show efficacy differences of essential oils between susceptible and organophosphate resistant strains of r. ( ... | 0 | 27692332 |
| assessment of the repellent effect of lippia alba essential oil and major monoterpenes on the cattle tick rhipicephalus microplus. | the control of rhipicephalus microplus (ixodida: ixodidae) is achieved using synthetic acaricides. however, resistant tick populations are widespread around the world. plant essential oils can act as repellents, keeping ticks away from hosts and decreasing the selection pressure on synthetic acaricides. the aim of this study was to evaluate the in vitro repellent effect of lippia alba essential oil on r. microplus larvae. leaves from two l. alba genotypes maintained under the same agronomic and ... | 0 | 26471008 |
| nomuraea rileyi as biological control agents of rhipicephalus microplus tick. | nomuraea rileyi, a fungus pathogenic to insects, has been widely used for biological control of agricultural pests in brazil. this study investigates the effects of n. rileyi, isolates nr 138, nr 151, and nr 177, to eggs, larvae, and engorged females of rhipicephalus microplus tick. specimens were immersed in 1 ml of conidial suspension for 3 min, whereas the control group was immersed in 0.01% tween 80 water solution. the isolate nr 138 controlled 67.37% of ticks when the highest conidial conce ... | 2012 | 22782472 |
| rickettsia spp. among wild mammals and their respective ectoparasites in pantanal wetland, brazil. | the genus rickettsia comprises obligatory intracellular bacteria, well known to cause zoonotic diseases around the world. the present work aimed to investigate the occurrence of rickettsia spp. in wild animals, domestic dogs and their respective ectoparasites in southern pantanal region, central-western brazil, by molecular and serological techniques. between august 2013 and march 2015, serum, whole blood and/or spleen samples were collected from 31 coatis, 78 crab-eating foxes, seven ocelots, 4 ... | 2018 | 29111373 |
| molecular detection and identification of rickettsia species in ticks (acari: ixodidae) collected from belize, central america. | little is known about tick-borne rickettsial pathogens in belize, central america. we tested ixodid ticks for the presence of rickettsia species in three of the six northern and western belizean districts. ticks were collected from domestic animals and tick drags over vegetation in 23 different villages in november 2014, february 2015, and may 2015. a total of 2,506 collected ticks were identified to the following species: dermacentor nitens neumann (46.69%), rhipicephalus sanguineus (latreille) ... | 2017 | 28981693 |
| evaluation of phytotherapy alternatives for controlling rhipicephalus (boophilus) microplus in vitro. | the objective of this study was to identify the main chemical components of the essential oil of cuminum cyminum l. (cumin) and of the fixed oils of bertholletia excelsa (brazil nut) and of helianthus annuus (sunflower seed). as well as testing the three oils and three different commercial synthetic acaricides against engorged females of rhipicephalus (boophilus) microplus in order to explore their acaricidal efficacy. six different concentrations of the oils (200, 100, 50, 25, 12.5 and 6.25 mg/ ... | 2017 | 28977244 |
| inhibition of the recombinant cattle tick rhipicephalus (boophilus) annulatus glutathione s-transferase. | rhipicephalus (boophilus) annulatus is a bloodsucking ectoparasite that causes severe production losses in the cattle industry. this study aims to evaluate the in vitro effects of tannic acid, hematin (gst inhibitors) and different plant extracts (rich in tannic acid) on the activity of the recombinant glutathione s-transferase enzyme of the egyptian cattle tick r. annulatus (rragst), in order to confirm their ability to inhibit the parasitic essential detoxification enzyme glutathione s-transfe ... | 2014 | 24953796 |
| experimental infection of rickettsia parkeri in the rhipicephalus microplus tick. | this study aimed to evaluate, by means of artificial feeding, the interaction between a pathogenic rickettsia and the hard tick r. microplus. we used partially engorged females fed on calves free of rickettsia spp. group 1 (g1), containing 20 ticks, was fed bovine blood only. group 2 (g2), containing 20 ticks, was fed blood containing uninfected vero cells, and group 3 (g3), containing 40 ticks, was fed blood containing vero cells infected with rickettsia parkeri. biological parameters of the no ... | 2018 | 29102467 |
| tick-host range adaptation: changes in protein profiles in unfed adult ixodes scapularis and amblyomma americanum saliva stimulated to feed on different hosts. | understanding the molecular basis of how ticks adapt to feed on different animal hosts is central to understanding tick and tick-borne disease (tbd) epidemiology. there is evidence that ticks differentially express specific sets of genes when stimulated to start feeding. this study was initiated to investigate if ticks such as ixodes scapularis and amblyomma americanum that are adapted to feed on multiple hosts utilized the same sets of proteins to prepare for feeding. we exposed i. scapularis a ... | 2017 | 29312895 |
| relative transcription of autophagy-related genes in amblyomma sculptum and rhipicephalus microplus ticks. | ticks endure stressful off-host periods and perform as vectors of a diversity of infectious agents, thus engaging pathways that expectedly demand for autophagy. little is known of ticks' autophagy, a conserved eukaryotic machinery assisting in homeostasis processes that also participates in tissue-dependent metabolic functions. here, the autophagy-related atg4 (autophagin-1), atg6 (beclin-1) and atg8 (lc3) mrnas from the human diseases vector amblyomma sculptum and the cattle-tick rhipicephalus ... | 2017 | 29181673 |
| contributions to the knowledge of hard ticks (acari: ixodidae) in colombia. | the known tick fauna of colombia includes 58 species (15 argasidae and 43 ixodidae). to add to the knowledge of the biology of ticks in colombia, hard ticks (ixodidae) were collected from domestic animals or vegetation during 2014-2016 in 10 of colombia's departments. ticks were identified to species through morphological examinations. taxonomic identification was confirmed for some specimens by molecular methods, including phylogenetic analyses inferred from three tick genes (cytochrome c oxida ... | 2018 | 29055642 |
| immunological control of ticks and tick-borne diseases that impact cattle health and production. | the cattle industry is one of the most important agroeconomic activities in mexico. the national herd is estimated to include approximately 33.5. million head of cattle. ticks and tick-borne diseases are principal factors with a negative impact on cattle health and production. the most economically important tick species parasitizing cattle in mexico are rhipicephalus microplus, r. annulatus, and amblyomma mixtum. parasitism by ticks affects cattle health and production directly. morbidity and m ... | 2018 | 29293449 |
| prevalence, intensity and population dynamics of hard ticks (acari: ixodidae) on sheep in the humid tropics of mexico. | hard ticks are a perennial problem in livestock systems throughout mexico. no data are currently available on tick prevalence, infestation intensity and population dynamics for sheep in the humid tropics of mexico. blackbelly sheep (n = 30) in tabasco state, mexico, were examined every 3 weeks for 1 year, and all ixodidae ticks were counted and removed for analysis. tick species were identified, infestation prevalence and intensity calculated per animal, and infestation per body zone determined. ... | 2017 | 29255964 |
| mycoplasma ovis infection in goat farms from northeastern brazil. | although mycoplasma ovis (formerly eperythrozoon ovis) has been described in small ruminants worldwide, data on m. ovis in goats remain scarce. accordingly, the aims of the present study were to i) determine the prevalence of hemoplasmas in goats, ii) identify the tick species parasitizing the animals, and iii) determine factors associated with infection in five dairy and three beef goat farms from the paraíba state, northeastern brazil. blood samples were obtained from 402 goats. samples were s ... | 2017 | 29127988 |
| a molecular survey of tick-borne pathogens from ticks collected in central queensland, australia. | central queensland (cq) is a large and isolated, low population density, remote tropical region of australia with a varied environment. the region has a diverse fauna and several species of ticks that feed upon that fauna. this study examined 518 individual ticks: 177 rhipicephalus sanguineus (brown dog tick), 123 haemaphysalis bancrofti (wallaby tick), 102 rhipicephalus australis (australian cattle tick), 47 amblyomma triguttatum (ornate kangaroo tick), 57 ixodes holocyclus (paralysis tick), 9 ... | 2018 | 29336689 |
| presence of borrelia spp. dna in ticks, but absence of borrelia spp. and of leptospira spp. dna in blood of fever patients in madagascar. | the occurrence of tick-borne relapsing fever and leptospirosis in humans in madagascar remains unclear despite the presence of their potential vectors and reservoir hosts. we screened 255 amblyomma variegatum ticks and 148 rhipicephalus microplus ticks from zebu cattle in madagascar for borrelia-specific dna. borrelia spp. dna was detected in 21 amblyomma variegatum ticks and 2 rhipicephalus microplus ticks. one borrelia found in one rhipicephalus microplus showed close relationship to borrelia ... | 2018 | 28986249 |
| review of cattle ticks (acari, ixodida) in ivory coast and geographic distribution of rhipicephalus (boophilus) microplus, an emerging tick in west africa. | the exotic tick rhipicephalus (boophilus) microplus was discovered in ivory coast in 2007 and then gradually in other countries in west africa. it is known to induce significant losses in farming and to replace other species of the same genus. in order to contribute to improve health and productivity of cattle in ivory coast regarding the emergence of this dreaded tick, a study was conducted to determine the current geographic distribution of the tick r. (b.) microplus and review cattle ticks in ... | 2017 | 28497303 |
| acaricidal, pediculicidal and larvicidal activity of synthesized zno nanoparticles using momordica charantia leaf extract against blood feeding parasites. | the aim of the present study was to evaluate the acaricidal, pediculicidal and larvicidal effect of synthesized zinc oxide nanoparticles (zno nps) using momordica charantia leaf extract against the larvae of rhipicephalus (boophilus) microplus, adult of pediculus humanus capitis, and the larvae of anopheles stephensi, culex quinquefasciatus. the zno nps were characterized by using uv, xrd, ftir and sem-edx. the sem image confirms that the synthesized nanoparticles were spherical in shape with a ... | 2017 | 28760358 |
| parasiticide resistance in flies, lice and ticks in new zealand and australia: mechanisms, prevalence and prevention. | this review outlines the history of parasiticide resistance in the principal ectoparasites of sheep and cattle in new zealand and australia, blowflies, buffalo fly (haematobia irritans exigua), sheep biting louse (bovicola ovis) and cattle ticks, and discusses recent changes in their response to insecticides and acaricides. mechanisms of resistance and evaluation methods are described, with ways in which insecticide resistance can be avoided or ameliorated also discussed. resistance in sheep blo ... | 2015 | 25185062 |
| the effectiveness of a fixed-dose combination pour-on formulation of 1.25% fipronil and 2.5% fluazuron against economically important ectoparasites and associated pharmacokinetics in cattle. | the present work consisted of eight studies to evaluate the ectoparasiticidal spectrum and determine the pharmacokinetic parameters of a pour-on combination of fipronil 1.25mg/kg+fluazuron 2.5mg/kg for cattle against rhipicephalus microplus, haematobia irritans and the larvae of dermatobia hominis and cochliomyia hominivorax. the analysis fipronil and fluazuron were performed by liquid chromatography using a mass detector for the detection and quantification of analytes (lc-ms/ms). additionally, ... | 2017 | 28527785 |
| reassessment of the potential economic impact of cattle parasites in brazil. | the profitability of livestock activities can be diminished significantly by the effects of parasites. economic losses caused by cattle parasites in brazil were estimated on an annual basis, considering the total number of animals at risk and the potential detrimental effects of parasitism on cattle productivity. estimates in u.s. dollars (usd) were based on reported yield losses among untreated animals and reflected some of the effects of parasitic diseases. relevant parasites that affect cattl ... | 2014 | 25054492 |
| does rhipicephalus microplus tick infestation increase the risk for myiasis caused by cochliomyia hominivorax in cattle? | the larval phase of cochliomyia hominivorax (screwworm) is an obligate parasite of vertebrate animals, particularly mammals, and widespread in south america, where it remains one of the most important parasitic diseases of domestic animals. the skin of cattle highly infested by ticks, with cutaneous lesions, exudation of tissue fluid and blood scent seems to produce the ideal environment for fly attraction. however, an association between these parasites was never investigated. the aim of this w ... | 2014 | 24176137 |
| differential haematobia irritans infestation levels in beef cattle raised in silvopastoral and conventional pasture systems. | the use of silvopastoral systems (sps) can be a good alternative to reduce the environmental impacts of livestock breeding in brazil. one of the reasons for its scarce adoption is the lack of information on health and productivity of cattle raised under these conditions. the experiment reported here was designed to compare the infestation by external parasites - the cattle tick (rhipicephalus microplus), horn fly (haematobia irritans), and larvae of the botfly (dermatobia hominis) - in beef catt ... | 2017 | 28969788 |
| molecular identification of tick-borne pathogens infecting cattle in mymensingh district of bangladesh reveals emerging species of anaplasma and babesia. | tick-borne diseases are considered a major hindrance to the health and productive performance of cattle in bangladesh. to elucidate the epidemiology of tick-borne pathogens (tbps) in local cattle, a cross-sectional study was performed in the 12 subdistricts (upazilas) of mymensingh district in bangladesh. blood samples and ticks were collected from 384 clinically healthy cattle kept by 135 farmers from 96 randomly selected villages. dna extracted from the blood samples was subsequently screened ... | 2017 | 29119682 |
| extensive diversity of rickettsiales bacteria in ticks from wuhan, china. | rickettsiales bacteria are important agents of (re)emerging infectious diseases, with ticks playing a key role in their evolution and transmission. we collected 1079 hard ticks belonging to five species (ixodes sinensis, rhipicephalus microplus, haemaphysalis flava, haemaphysalis hystricis and haemaphysalis longicornis) from cattle and goats in wuhan city, hubei province, china. the dominant tick species was h. longicornis (578, 53.57%), followed by r. microplus (354, 32.81%), h. hystricis (62, ... | 2017 | 28411028 |
| effect of recombinant glutathione s-transferase as vaccine antigen against rhipicephalus appendiculatus and rhipicephalus sanguineus infestation. | the ticks rhipicephalus appendiculatus and rhipicephalus sanguineus are the main vectors of theileria parva and babesia spp. in cattle and dogs, respectively. due to their impact in veterinary care and industry, improved methods against r. appendiculatus and r. sanguineus parasitism are under development, including vaccines. we have previously demonstrated the induction of a cross-protective humoral response against rhipicephalus microplus following vaccination with recombinant glutathione s-tra ... | 2017 | 29056423 |
| molecular characterization and expression analysis of three novel autophagy-related genes from the cattle tick rhipicephalus (boophilus) microplus (acari: ixodidae). | the cattle tick rhipicephalus (boophilus) microplus is a hematophagous ectoparasite of major importance for the livestock industry. it shows a remarkable ability to survive over long periods without feeding. however, the mechanisms used to endure long-term starvation are poorly understood. it is believed that autophagy, a process of intracellular protein degradation, may play a significant role to confront adverse environmental conditions. to advance our understanding of autophagy in r. microplu ... | 2016 | 27609093 |
| multi-antigenic vaccine against the cattle tick rhipicephalus (boophilus) microplus: a field evaluation. | the tick rhipicephalus (boophilus) microplus is a blood-sucking ectoparasite of cattle that severely impairs livestock production. studies on tick immunological control address mostly single-antigen vaccines. however, from the commercial standpoint, so far no single-antigen vaccine has afforded appropriate protection against all r. microplus populations. in this context, multi-antigen cocktails have emerged as a way to enhance vaccine efficacy. in this work, a multi-antigenic vaccine against r. ... | 2012 | 22981764 |
| acetylcholinesterases of blood-feeding flies and ticks. | acetylcholinesterase (ache) is the biochemical target of organophosphate (op) and carbamate pesticides for invertebrates, vertebrate nerve agents, and ache inhibitors used to reduce effects of alzheimer's disease. organophosphate pesticides (ops) are widely used to control blood-feeding arthropods, including biting flies and ticks. however, resistance to ops in pests affecting animal and human health has compromised control efficacy. op resistance often results from mutations producing an op-ins ... | 2013 | 23036311 |
| functional characterization of candidate antigens of hyalomma anatolicum and evaluation of its cross-protective efficacy against rhipicephalus microplus. | hyalomma anatolicum and rhipicephalus microplus seriously affect dairy animals and immunization of host is considered as a sustainable option for the management of the tick species. identification and validation of protective molecules are the major challenges in developing a cross-protective vaccine. the subolesin (sub), calreticulin (crt) and cathepsin l-like cysteine proteinase (cathl) genes of h. anatolicum were cloned, sequenced and analysed for sequence homology. both ha-sub and ha-crt gen ... | 2017 | 28911904 |
| comparative study of esterases in deltamethrin and diazinon resistant rhipicephalus microplus and hyalomma anatolicum ticks collected from the trans-gangetic plains of india. | a comparative analysis of esterases in susceptible and resistant ticks revealed six types of esterases (est-1b, est-2b, est-3b, est-4b, est-5b and est-6b) in rhipicephalus microplus and four types (est-1h, est-2h, est-3h, est-4h) in hyalomma anatolicum using α-naphthyl acetate substrate. inhibition studies with eserine sulfate, p-chloromercuribenzoate, copper sulphate and phenylmethylsulfonyl fluoride revealed a marked variation in band intensity between susceptible and resistant ticks, with the ... | 2017 | 28894981 |
| distribution of ticks infesting ruminants and risk factors associated with high tick prevalence in livestock farms in the semi-arid and arid agro-ecological zones of pakistan. | tick infestation is the major problem for animal health that causes substantial economic losses, particularly in tropical and subtropical countries. to better understand the spatial distribution of tick species and risk factors associated with tick prevalence in livestock in pakistan, ticks were counted and collected from 471 animals, including 179 cattle, 194 buffaloes, 80 goats and 18 sheep, on 108 livestock farms in nine districts, covering both semi-arid and arid agro-ecological zones. | 2017 | 28420420 |
| acaricide resistance in rhipicephalus (boophilus) microplus and hyalomma anatolicum collected from haryana and rajasthan states of india. | acaricide resistance status of rhipicephalus (boophilus) microplus and hyalomma anatolicum ticks against deltamethrin and diazinon was assessed in hisar (haryana) and its adjoining district churu (rajasthan) using adult immersion test (ait) and larval packet test (lpt). the mortality slope, lc50, lc95, 95 % confidence limit and resistance factor of field ticks were determined. results showed that r. (b.) microplus ticks collected from tohana (hisar) were found resistant to both the acaricides wh ... | 2016 | 27100113 |
| esterase and glutathione s-transferase levels associated with synthetic pyrethroid resistance in hyalomma anatolicum and rhipicephalus microplus ticks from punjab, india. | larval packet test was used for assessment of resistance status against cypermethrin and deltamethrin in hyalomma anatolicum and rhipicephalus microplus from various districts of punjab (india). among the various field isolates of h. anatolicum susceptible status was recorded against cypermethrin in all isolates, whereas against deltamethrin resistance status (level i-iii) was recorded. in r. microplus lower resistance levels (i-ii) were recorded against cypermethrin in comparison to deltamethri ... | 2015 | 25652614 |
| a comparative study on cypermethrin resistance in rhipicephalus (boophilus) microplus and hyalomma anatolicum from punjab (india). | a study to evaluate cypermethrin resistance in rhipicephalus (boophilus) microplus and hyalomma anatolicum collected from muktsar and mansa districts of punjab state, india, was conducted by using adult immersion test (ait). the regression graphs of probit mortality of ticks plotted against log values of concentrations of cypermethrin was utilized for the determination of slope of mortality, lethal concentration for 50% (lc50), and the resistance factor (rf). on the basis of the data generated o ... | 2014 | 24252261 |
| comparative efficacy of rhaa86 and rbm86 against hyalomma anatolicum anatolicum and rhipicephalus (boophilus) microplus. | hyalomma anatolicum anatolicum and rhipicephalus (boophilus) microplus are the most economically important tick species in india and other tropical and subtropical regions of the world and transmit pathogens causing animal and human diseases. we demonstrated that vaccination of animal by rhaa86 could be used for the control of both h. a. anatolicum and r. (b.) microplus infestations. by comparing the efficacy of rhaa86 and rbm86, it was observed that vaccine based on rhaa86 will be more effectiv ... | 2012 | 22313386 |
| molecular characterization of bm86 gene orthologs from hyalomma excavatum, hyalomma dromedarii and hyalomma marginatum marginatum and comparison with a vaccine candidate from hyalomma scupense. | the ixodid ticks from the hyalomma genus are important pests of livestock, having major medical and veterinary significance in northern africa. beside their direct pathogenic effects, these species are vectors of important diseases of livestock and in some instances of zoonoses. anti-tick vaccines developed in australia and cuba based on the concealed antigen bm86 have variable efficacy against h. anatolicum and h. dromedarii. this variation in vaccine efficacy could be explained by the variabil ... | 2012 | 22683299 |
| frequency distribution of hard ticks (acari: ixodidae) infesting bubaline population of district toba tek singh, punjab, pakistan. | the current research was conducted to define the epidemiological parameters related to the prevalence and associated risk factors of tick infestation in buffaloes in the toba tek singh district of central punjab, pakistan. the prevalence of ticks on buffaloes was 31.21 % (352/1,128). among the species of ticks, the prevalence of hyalomma marginatum (75.56 %; 266/352) was higher (p < 0.05; odd's ratios (or) = 3.09) than rhipicephalus microplus (24.44 %; 86/352). female buffaloes (69.60 %; 245/352 ... | 2013 | 23086441 |
| a list of the 70 species of australian ticks; diagnostic guides to and species accounts of ixodes holocyclus (paralysis tick), ixodes cornuatus (southern paralysis tick) and rhipicephalus australis (australian cattle tick); and consideration of the place of australia in the evolution of ticks with comments on four controversial ideas. | seventy species of ticks are known from australia: 14 soft ticks (family argasidae) and 56 hard ticks (family ixodidae). sixteen of the 70 ticks in australia may feed on humans and domestic animals (barker and walker 2014). the other 54 species of ticks in australia feed only on wild mammals, reptiles and birds. at least 12 of the species of ticks in australian also occur in papua new guinea. we use an image-matching system much like the image-matching systems of field guides to birds and flower ... | 2014 | 25236960 |
| molecular and structural characterization of novel cystatins from the taiga tick ixodes persulcatus. | cystatins are cysteine peptidase inhibitors that in ticks mediate processes such as blood feeding and digestion. the ixodid tick ixodes persulcatus is endemic to the eurasia, where it is the principal vector of lyme borreliosis. to date, no i. persulcatus cystatin has been characterized. in the present work, we describe three novel cystatins from i. persulcatus, named jpipcys2a, jpipcys2b and jpipcys2c. in addition, the potential of tick cystatins as cross-protective antigens was evaluated by va ... | 2017 | 28174118 |
| reprolysin metalloproteases from ixodes persulcatus, rhipicephalus sanguineus and rhipicephalus microplus ticks. | metalloproteases (mps) have been considered essential for blood feeding and other physiological functions in several hematophagous animals, including ticks. we report the characterization of mp sequences of three important ticks from asia, africa and america: ixodes persulcatus (ip-mps), rhipicephalus sanguineus (rs-mps) and r. microplus (brrm-mps). amino acid sequence identity between r. microplus and r. sanguineus mps ranged from 76 to 100 %, and identities among i. persulcatus, i. ricinus and ... | 2014 | 24687173 |
| control of infestations by ixodes ricinus tick larvae in rabbits vaccinated with aquaporin recombinant antigens. | tick-borne diseases greatly impact human and animal health worldwide, and vaccines are an environmentally friendly alternative to acaricides for their control. recent results have suggested that aquaporin (aqp) water channels have a key function during tick feeding and development, and constitute good candidate antigens for the control of tick infestations. | 2017 | 28161419 |
| gene-enriched draft genome of the cattle tick rhipicephalus microplus: assembly by the hybrid pacific biosciences/illumina approach enabled analysis of the highly repetitive genome. | the genome of the cattle tick rhipicephalus microplus, an ectoparasite with global distribution, is estimated to be 7.1gbp in length and consists of approximately 70% repetitive dna. we report the draft assembly of a tick genome that utilized a hybrid sequencing and assembly approach to capture the repetitive fractions of the genome. our hybrid approach produced an assembly consisting of 2.0gbp represented in 195,170 scaffolds with a n50 of 60,284bp. the rmi v2.0 assembly is 51.46% repetitive wi ... | 2017 | 28577881 |
| tick salivary cholinesterase: a probable immunomodulator of host-parasite interactions. | the southern cattle tick, rhipicephalus (boophilus) microplus (canestrini), is the most economically important cattle ectoparasite in the world. rhipicephalus microplus and rhipicephalus annulatus (say) continue to threaten u.s. cattle producers despite eradication and an importation barrier based on inspection, dipping of imported cattle in organophosphate (op) acaricide, and quarantine of infested premises. op acaricides inhibit acetylcholinesterase (ache), essential to tick central nervous sy ... | 2016 | 26794231 |
| molecular and functional characterization of the first tick cap2b (periviscerokinin) receptor from rhipicephalus (boophilus) microplus (acari: ixodidae). | the cdna of the receptor for cap(2b)/periviscerokinin (pvk) neuropeptides, designated rhimi-cap(2b)-r, was cloned from synganglia of tick rhipicephalus (boophilus) microplus. this receptor is the ortholog of the insect cap(2b)/pvk receptor, as concluded from analyses of the predicted protein sequence, phylogenetics and functional expression. expression analyses of synganglion, salivary gland, malpighian tubule, and ovary revealed rhimi-cap(2b)-r transcripts. the expression in mammalian cells of ... | 2013 | 24055303 |
| estimates of repeatability and correlations of hemoparasites infection levels for cattle reared in endemic areas for rhipicephalus microplus. | rhipicephalus microplus is a vector of cattle tick fever, a disease caused by the protozoans babesia bovisand b. bigemina, and also anaplasmosis, produced by the rickettsiales anaplasma marginale. these tick-borne pathogens cause considerable losses to brazilian livestock breeders and represent an obstacle to the expanded use of taurine breeds due to their higher sensitivity to ticks and hemoparasites compared to zebu breeds. differences in the susceptibility to hemoparasites were also verified ... | 2018 | 29329629 |
| determination and validation of discriminating concentration of ivermectin against rhipicephalus microplus. | rhipicephalus microplus, the major cattle tick species of india is prevalent all over the country and causes huge economic loss directly or indirectly to the dairy industries. chemical acaricides are playing an important role in managing tick infestations on livestock for many years and consequently, resistance to commonly used organophosphate (op) and synthetic pyrethroid (sp) compounds has been reported. subsequently, ivermectin (ivm) has been emerged as an alternative to manage op and sp resi ... | 2018 | 29329620 |
| ehrlichia and anaplasma infections: serological evidence and tick surveillance in peninsular malaysia. | little information is available on human anaplasmosis and ehrlichiosis in southeast asia despite increasing reports of the detection of anaplasma spp. and ehrlichia spp. in the ticks. we report herein the serological findings against the tick-borne pathogens in a group of animal farm workers (n = 87) and indigenous people (n = 102) in peninsular malaysia. igg antibodies against ehrlichia chaffeensis were detected from 29.9% and 34.3% of farm workers and indigenous people, respectively, using com ... | 2017 | 29202206 |
| efficacy of commercial synthetic pyrethroids and organophosphates associations used to control rhipicephalus (boophilus) microplus in southern brazil. | this study evaluated the acaricidal efficiency of synthetic pyrethroids (sp) associated with organophosphates (op) against rhipicephalus (boophilus) microplus populations in the state of rio grande do sul, southern brazil. ticks were collected in 54 cattle farms and tested using in vitro adult immersion test against four commercially available acaricide mixtures of sp and op. only one of four acaricides, comprising a mixture of cypermethrin, chlorpyrifos, and fenthion, had a mean efficiency high ... | 2017 | 29091122 |
| advances in tick vaccinology in brazil: from gene expression to immunoprotection. | rhipicephalus (boophilus) microplus has substantial economic impact on the cattle breeding industry and, chemical control and tick resistance development are the major concern. there is a worldwide search for new options, and control using vaccines has been the main focus nowadays. studies performed in brazil found that bm86-based immunization of bovines reduced the infestation of r. (b.) microplus of vaccinated bovines by 45% to 60%. native boophilusmicroplus tripsin inhibitors (bmtis) with try ... | 2018 | 28930522 |
| characterization of a novel cystatin type 2 from rhipicephalus microplus midgut. | the rhipicephalus (boophilus) microplus is an exclusive bovine ectoparasite responsible for the transmission of pathogens that decrease meat, leather and milk productions. cattle vaccination is an alternative to control tick infestations, but the discovery of potential antigens is still a challenge for researchers. recently, our group performed a midgut transcriptome of engorged r. microplus tick, and out of 800 ests sequences one cystatin-coding sequence was identified and named rmcystatin-4. i ... | 2017 | 28735872 |
| molecular quantitative assay for esterase-mediated organophosphate resistance in rhipicephalus microplus. | the use of pesticides is the main tool to control infestations of the cattle tick rhipicephalus microplus, and organophosphate (op) is one of the most used compounds for this purpose. carboxylesterases (ches) are targets for op pesticides in arthropods, and acetylcholinesterase 2 (ache2) and esterase 1 (est1) are metabolic enzymes involved in the xenobiotic detoxification process. the increase in the synthesis of these enzymes can be detected by the quantitative polymerase chain reaction (qpcr) ... | 2017 | 28566216 |
| mining a differential sialotranscriptome of rhipicephalus microplus guides antigen discovery to formulate a vaccine that reduces tick infestations. | ticks cause massive damage to livestock and vaccines are one sustainable substitute for the acaricides currently heavily used to control infestations. to guide antigen discovery for a vaccine that targets the gamut of parasitic strategies mediated by tick saliva and enables immunological memory, we exploited a transcriptome constructed from salivary glands from all stages of rhipicephalus microplus ticks feeding on genetically tick-resistant and susceptible bovines. | 2017 | 28446245 |
| pyrethroid resistance in iranian field populations of rhipicephalus (boophilus) annulatus. | resistance to acaricides in ticks is becoming increasingly widespread throughout the world; therefore, tick control requires resistance monitoring for each tick species. the aims of this study were to monitor the susceptibility status of the cattle tick, rhipicephalus (boophilus) annulatus (acari: ixodidae), against pyrethroid acaricides from mazandaran province, northern iran, and where resistance was evident, and establish the possible underlying mechanisms. fully engorged adult r. (b.) annula ... | 2017 | 28187834 |
| phylogenetic analysis of mitochondrial genome sequences indicates that the cattle tick, rhipicephalus (boophilus) microplus, contains a cryptic species. | cattle ticks of the subgenus rhipicephalus (boophilus) are major agricultural pests worldwide, causing billions of dollars in losses annually. rhipicephalus (boophilus) annulatus and r. microplus are the most well-known and widespread species, and a third species, r. australis, was recently reinstated for 'r. microplus' from australia and parts of southeast asia. we use mitochondrial genome sequences to address the phylogenetic relationships among the species of the subgenus boophilus. we sequen ... | 2014 | 24685498 |
| geographic distribution of the invasive cattle tick rhipicephalus microplus, a country-wide survey in benin. | the cattle tick rhipicephalus microplus is currently invading the west african region, and little information is available on the spread of this exotic tick in this region. we set out a country-wide field survey to determine its current distribution in benin. ticks were collected on cattle from 106 farms selected by random sampling covering all regions of the country. rhipicephalus annulatus was found on 70 % of all farms, r. decoloratus on 42 %, r. geigyi on 58 %, and r. microplus on 49 %. ther ... | 2012 | 22689006 |
| homology within the x chromosomes of boophilus microplus (canestrini) and b. annulatus (say). | chromosome banding patterns of the x chromosomes of boophilus annulatus (say) and b. microplus (canestrini) indicate considerable homology between the two species. all bands of the small x chromosome of b. microplus are represented in the large x chromosome of b. annulatus with the exception of one medially located dark band. a large region of material proximal to the centromere and a small segment located at the telomere of the large x chromosome of b. annulatus are not represented in the small ... | 2007 | 8228176 |
| survival of larvae of boophilus annulatus, boophilus microplus, and boophilus hybrids (acari: ixodidae) in different temperature and humidity regimes in the laboratory. | the survival period for larvae of boophilus annulatus (say), boophilus microplus (canestrini) and hybridized boophilus ticks was determined by exposure to various combinations of temperature (20, 25, 30 and 35 degrees c) and relative humidity (32, 63, 75, 84 and 97% rh) in the laboratory. results indicated that within a given temperature and rh regime, there was no difference (p greater than 0.05) in larval survival among the three species tested, indicating that these ticks respond similarly ov ... | 1991 | 1788937 |
| expression profile of rhipicephalus microplus vitellogenin receptor during oogenesis. | the vitellogenin receptor (vgr), which belongs to the low-density lipoprotein receptors (ldlr) family, regulates the absorption of yolk protein accumulated in developing oocytes during oogenesis. in the present study, the full sequence of rhipicephalus microplus vgr (rmvgr) and the partial sequence of rhipicephalus appendiculatus vgr (ravgr) orf were determined and cloned. the rmvgr amino acid sequence contains the five highly conserved structural motifs characteristic of ldlr superfamily member ... | 2018 | 29054547 |
| extensive polymorphism of ra86 genes in field populations of rhipicephalus appendiculatus from kenya. | commercial vaccines based on recombinant forms of the bm86 tick gut antigen are used to control the southern cattle tick, rhipicephalus microplus, a 1-host species, in australia and latin america. we describe herein sequence polymorphism in genes encoding ra86 homologues of bm86 in the brown ear tick, rhipicephalus appendiculatus, isolated from four kenyan field populations and one laboratory colony. sequencing of 19 ra86 sequences defined two alleles differentiated by indels, encoding 693 amino ... | 2016 | 27051976 |
| experimental efficacy of a vaccine against rhipicephalus australis. | despite several decades of chemical use the cattle tick, rhipicephalus australis, still represents an important threat for breeders of tick susceptible cattle under tropical conditions. the intense use of acaricides has lead to the development of multi-resistant strains of ticks and alternative means of control need to be developed to maintain control. a vaccine against ticks, based on the boophilus microplus bm86 protein, is one of the promising alternative means of tick control. in this invest ... | 2017 | 29110171 |
| evaluation of three adjuvants with respect to both adverse effects and the efficacy of antibody production to the bm86 protein. | cattle tick infestations remain an important burden for farmers in tropical area like in new caledonia. with the development of acaricide resistance, tick vaccines should be an attractive alternative to control ticks but their efficacy needs to be improved. in this study three adjuvants were studied in an experimental tick vaccine with a bm86 protein to assess their performance in terms of antibody productions and adverse reactions following vaccinations. the water-in-oil adjuvant isa 61 vg led ... | 2017 | 28752480 |
| bioinformatic prediction of g protein-coupled receptor encoding sequences from the transcriptome of the foreleg, including the haller's organ, of the cattle tick, rhipicephalus australis. | the cattle tick of australia, rhipicephalus australis, is a vector for microbial parasites that cause serious bovine diseases. the haller's organ, located in the tick's forelegs, is crucial for host detection and mating. to facilitate the development of new technologies for better control of this agricultural pest, we aimed to sequence and annotate the transcriptome of the r. australis forelegs and associated tissues, including the haller's organ. as g protein-coupled receptors (gpcrs) are an im ... | 2017 | 28231302 |
| repellent effects of melaleuca alternifolia (tea tree) oil against cattle tick larvae (rhipicephalus australis) when formulated as emulsions and in β-cyclodextrin inclusion complexes. | rhipicephalus australis (formerly boophilus microplus) is a one host tick responsible for major economic loss in tropical and subtropical cattle production enterprises. control is largely dependent on the application of acaricides but resistance has developed to most currently registered chemical groups. repellent compounds that prevent initial attachment of tick larvae offer a potential alternative to control with chemical toxicants. the repellent effects of melaleuca alternifolia oil (tto) emu ... | 2016 | 27369582 |
| the mitochondrial genome of a texas outbreak strain of the cattle tick, rhipicephalus (boophilus) microplus, derived from whole genome sequencing pacific biosciences and illumina reads. | the cattle fever tick, rhipicephalus (boophilus) microplus is one of the most significant medical veterinary pests in the world, vectoring several serious livestock diseases negatively impacting agricultural economies of tropical and subtropical countries around the world. in our study, we assembled the complete r. microplus mitochondrial genome from illumina and pac bio sequencing reads obtained from the ongoing r. microplus (deutsch strain from texas, usa) genome sequencing project. we compare ... | 2015 | 26117172 |
| reinstatement of rhipicephalus (boophilus) australis (acari: ixodidae) with redescription of the adult and larval stages. | rhipicephalus australis fuller, the australian cattle tick, is reinstated and the adults and larvae redescribed from material collected in australia. this long ignored boophilid was previously known as r. microplus canestrini for specimens reported in australia and new caledonia. the adults of r. australis are easily recognized by a combination of characters, such as the ventro-medial spurs in the palpal segments of the male, and the abundant, plumose, pale white setae on the dorsum of the femal ... | 2012 | 22897039 |
| rhipicephalus microplus (acarina, ixodidae) in angola: evidence of its establishment and expansion. | livestock constitutes a fundamental asset for the livelihood of rural communities in angola. rhipicephalus microplus (acarina, ixodidae) is considered to be the most important external parasite impacting the cattle industry in the world. the present work used a cross-sectional study on tick species infesting cattle in smallholder and commercial farms, to investigate the presence of r. microplus in angola. this species was found to be recently established in certain areas of cuanza-sul and bengue ... | 2018 | 29380168 |
| range expansion of the economically important asiatic blue tick, <i>rhipicephalus microplus</i>, in south africa. | the asiatic blue tick, rhipicephalus microplus, a known vector of bovine babesiosis and bovine anaplasmosis, is of great concern in the cattle industry. for this reason, detailed knowledge of the distribution of r. microplus is vital. currently, r. microplus is believed to be associated mainly with the northern and eastern savanna and grassland vegetation in south africa. the objective of the study was to record the distribution of r. microplus, and the related endemic rhipicephalus decoloratus, ... | 2017 | 29227140 |
| comparative microarray analyses of adult female midgut tissues from feeding rhipicephalus species. | the cattle tick, rhipicephalus microplus, has a debilitating effect on the livestock industry worldwide, owing to its being a vector of the causative agents of bovine babesiosis and anaplasmosis. in south africa, co-infestation with r. microplus and r. decoloratus, a common vector species on local livestock, occurs widely in the northern and eastern parts of the country. an alternative to chemical control methods is sought in the form of a tick vaccine to control these tick species. however, seq ... | 2015 | 25448423 |
| differentiation of boophilus decoloratus and boophilus microplus. | | 1986 | 3572961 |
| assortative mating between boophilus decoloratus and boophilus microplus (acari: ixodidae). | | 1986 | 3735355 |
| genetic incompatibility between boophilus decoloratus (koch, 1844) and boophilus microplus (canestrini, 1888) and hybrid sterility of australian and south african boophilus microplus (acarina: ixodidae). | virgin females of both boophilus decoloratus and boophilus microplus, when mated with males of the other species, subsequently produced sterile eggs. counts of spermiophore capsules in female seminal receptacles showed that the males of both species will mate with the females of both species and that b. microplus males show a slightly greater, but statistically insignificant, mating capacity than b. decoloratus males. south african b. microplus females, when mated with an australian strain of b. ... | 1978 | 571591 |
| metarhizium anisopliae s.l. modulation of lipid metabolism during tick infection is independent of ampk and erk pathways. | despite the importance of fat body in metabolism of arthropods, studies in ticks are scarce. this study evaluated the lipid composition and activation of extracellular signal-regulated protein kinase (erk) and amp-activated protein kinase (ampk) enzymes in rhipicephalus microplus fat body after infection with different isolates of the fungus metarhizium anisopliae sensu lato (metschnikoff, 1879) sorokin, 1883. the isolates cg 32, gc 112, gc 148, gc 347, and gc 629 were inoculated as viable or no ... | 2018 | 29352348 |
| population structure and genetic diversity of rhipicephalus microplus in zimbabwe. | recently there was an expansion in the geographic range of rhipicephalus microplus in zimbabwe. in order to understand gene flow patterns and population structure in this highly invasive and adaptable cattle tick, a population genetics study was carried out. eighty-seven r. microplus tick samples drawn from 5 distinct populations were genotyped using eight polymorphic microsatellite loci. genetic diversity (he) was high (0.755-0.802) in all the populations, suggesting high levels of gene flow wi ... | 2018 | 29325969 |
| cattle tick rhipicephalus microplus-host interface: a review of resistant and susceptible host responses. | ticks are able to transmit tick-borne infectious agents to vertebrate hosts which cause major constraints to public and livestock health. the costs associated with mortality, relapse, treatments, and decreased production yields are economically significant. ticks adapted to a hematophagous existence after the vertebrate hemostatic system evolved into a multi-layered defense system against foreign invasion (pathogens and ectoparasites), blood loss, and immune responses. subsequently, ticks evolve ... | 2017 | 29322033 |
| local immune response to larvae of rhipicephalus microplus in santa gertrudis cattle immune response against rhipicephalus microplus. | this study investigated the local immune response at larval attachment sites in santa gertrudis cattle with low and high levels of tick resistance. | 2018 | 29314141 |
| prevalence, risk factors, and genetic diversity of veterinary important tick-borne pathogens in cattle from rhipicephalus microplus-invaded and non-invaded areas of benin. | babesiosis, theileriosis, anaplasmosis, and heartwater are tick-borne diseases (tbd) that threaten livestock production in sub-saharan africa including benin. this country has been faced with an invasion of rhipicephalus microplus, a major vector for babesiosis, theileriosis, and anaplasmosis over the last decade. yet, data on tbd and the impact of the invasive ticks are lacking, making risk level evaluation and disease control arduous. in this study, epidemiological features of babesia bovis, b ... | 2017 | 29307783 |
| a soluble inorganic pyrophosphatase from the cattle tick rhipicephalus microplus capable of hydrolysing polyphosphates. | polyphosphates have been found in all cell types examined to date and play diverse roles depending on the cell type. in eukaryotic organisms, polyphosphates have been investigated mainly in mammalian cells, and only a few studies have addressed arthropods. pyrophosphatases have been shown to regulate polyphosphate metabolism. however, these studies were restricted to trypanosomatids. here we focus on the tick rhipicephalus microplus, a haematophagous ectoparasite that is highly harmful to cattle ... | 2017 | 29271528 |
| immune-related redox metabolism of embryonic cells of the tick rhipicephalus microplus (bme26) in response to infection with anaplasma marginale. | it is well known that reactive oxygen species (ros) and reactive nitrogen species (rns) are involved in the control of pathogens and microbiota in insects. however, the knowledge of the role of ros and rns in tick-pathogen and tick-microbiota interactions is limited. here, we evaluated the immune-related redox metabolism of the embryonic cell line bme26 from the cattle tick rhipicephalus microplus in response to anaplasma marginale infection. | 2017 | 29258559 |
| a coxiella mutualist symbiont is essential to the development of rhipicephalus microplus. | the cattle tick rhipicephalus microplus is a hematophagous ectoparasite that causes important economic losses in livestock. different species of ticks harbor a symbiont bacterium of the genus coxiella. it was showed that a coxiella endosymbiont from r. microplus (cerm) is a vertically transmitted mutualist symbiont, comprising 98% of the 16s rrna sequences in both eggs and larvae. sequencing of the bacterial genome revealed genes for biosynthetic pathways for several vitamins and key metabolic c ... | 2017 | 29242567 |
| historical review and insights on the livestock tick-borne disease research of a developing country: the philippine scenario. | tick-borne diseases (tbds) remain to be a global animal health threat. developing countries like the philippines is not exempt to this. despite the potential impact tbds can give to these countries, local government initiatives and researches remain to be limited. in the philippines, most epidemiological studies were confined only to specific areas, and predominantly in the northern area. due to its unique geography and limited studies, the current nationwide status of most tbds could not be cle ... | 2017 | 29197596 |
| detection of leishmania (v) guyanensis in rhipicephalus (boophilus) microplus (acari: ixodidae) collected from pecari tajacu. | previous studies identified the presence of leishmania infantum in rhipicephalus sanguineus and indicated the possibility that it could transmit leishmaniasis to a variety of hosts. | 2017 | 29161493 |
| bovine babesiosis: cattle protected in the field with a frozen vaccine containing babesia bovis and babesia bigemina cultured in vitro with a serum-free medium. | an attenuated live vaccine containing babesia bovis and b. bigemina cultured in vitro with a serum-free medium was assessed for its clinical protection conferred of naïve cattle, under natural tick-challenge in a high endemicity zone to babesia spp. three groups of six animals were treated as follows: group i (gi) received a vaccine derived from parasites cultured with a free-serum medium; group ii (gii) were immunized with the standard vaccine, with parasites cultured in a medium supplemented w ... | 2017 | 29155165 |
| strategies for the control of rhipicephalus microplus ticks in a world of conventional acaricide and macrocyclic lactone resistance. | infestations with the cattle tick, rhipicephalus microplus, constitute the most important ectoparasite problem for cattle production in tropical and subtropical regions worldwide, resulting in major economic losses. the control of r. microplus is mostly based on the use of conventional acaricides and macrocyclic lactones. however, the intensive use of such compounds has resulted in tick populations that exhibit resistance to all major acaricide chemical classes. consequently, there is a need for ... | 2018 | 29152691 |
| seasonal analysis and acaricidal activity of the thymol-type essential oil of ocimum gratissimum and its major constituents against rhipicephalus microplus (acari: ixodidae). | the tick rhipicephalus microplus affects cattle health, with production loss in tropical and subtropical regions. moreover, the use of commercial acaricides has been reduced due to the resistance of this parasite. although alternatives such as plant bioactive molecules have been sought, essential oils present variations in their chemical constituents due to environmental factors, which can interfere with their acaricidal activity. the objective of the present study was to evaluate the seasonal i ... | 2018 | 29152690 |
| characterization of a glycine-rich protein from rhipicephalus microplus: tissue expression, gene silencing and immune recognition. | salivary molecules, as glycine-rich proteins (grps), are essential to tick attachment and feeding on the host and are suggested to be involved in the host's immune system evasion, therefore representing natural candidates in the search for protective vaccine antigens. this work shows the molecular characterization of a grp from rhipicephalus microplus (rmgrp). the cdna and putative amino acid sequences were analysed, as well as the transcription level in tick tissues/developmental stages, showin ... | 2017 | 29144218 |