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cofeeding intra- and interspecific transmission of an emerging insect-borne rickettsial pathogen.cat fleas (ctenocephalides felis) are known as the primary vector and reservoir of rickettsia felis, the causative agent of flea-borne spotted fever; however, field surveys regularly report molecular detection of this infectious agent from other blood-feeding arthropods. the presence of r. felis in additional arthropods may be the result of chance consumption of an infectious bloodmeal, but isolation of viable rickettsiae circulating in the blood of suspected vertebrate reservoirs has not been d ...026414611
update on tick-borne rickettsioses around the world: a geographic approach.tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the spotted fever group of the genus rickettsia. these zoonoses are among the oldest known vector-borne diseases. however, in the past 25 years, the scope and importance of the recognized tick-associated rickettsial pathogens have increased dramatically, making this complex of diseases an ideal paradigm for the understanding of emerging and reemerging infections. several species of tick-borne rickettsiae that wer ...024092850
genome sequence of rickettsia conorii subsp. caspia, the agent of astrakhan fever.rickettsia conorii subsp. caspia is the agent of astrakhan fever, a spotted fever group rickettsiosis endemic to astrakhan, russia. the present study reports the draft genome of rickettsia conorii subsp. caspia strain a-167.022887666
high prevalence of rickettsia spp. infections in small mammals in taiwan.surveillance for rickettsia spp. is urgently needed due to the recent emergence of many novel rickettsioses around the globe, but previous studies in taiwan have been limited to small areas and no investigation of infections in vertebrate hosts has ever been attempted. we surveyed rickettsial infections systematically in small-mammal hosts trapped between 2006 and 2010 throughout taiwan. fragments of ompb and glta genes in the liver, spleen, and kidney of mammals were targeted by nested polymera ...025629776
blood parasites of livestock in certain regions in saudi arabia.blood samples from camels, sheep, goats and cattle from six regions in saudi arabia were examined for blood parasites. asir region camels were disinfected while those of the eastern, jazan, northern frontiers, riyadh and tabouk regions were infected with trypanosoma evansi (5-40%), those of riyadh and the eastern regions were infected with dipetalonema evansi (1-6%) and those of the eastern, jazan and riyadh regions were infected with eperythrozoon species (8-20%). sheep and goats of all tested ...023961044
feeding period required by amblyomma aureolatum ticks for transmission of rickettsia rickettsii to vertebrate hosts.rocky mountain spotted fever is endemic to the são paulo metropolitan area, brazil, where the etiologic agent, rickettsia rickettsii, is transmitted to humans by adult amblyomma aureolatum ticks. we determined the minimal feeding period required by a. aureolatum nymphs and adults to transmit r. rickettsii to guinea pigs. unfed nymphs and unfed adult ticks had to be attached to the host for >10 hours to transmit r. rickettsii. in contrast, fed ticks needed a minimum of 10 minutes of attachment to ...025148391
rickettsia and vector biodiversity of spotted fever focus, atlantic rain forest biome, brazil. 024565262
serological survey of ehrlichia species in dogs, horses and humans: zoonotic scenery in a rural settlement from southern brazil.the aims of this study were to determine the seroprevalence of ehrlichia spp. and risk factors for exposure in a restricted population of dogs, horses, and humans highly exposed to tick bites in a brazilian rural settlement using a commercial elisa rapid test and two indirect immunofluorescent assays (ifa) with e. canis and e. chaffeensis crude antigens. serum samples from 132 dogs, 16 horses and 100 humans were used. fifty-six out of 132 (42.4%) dogs were seropositive for e. canis. dogs > one y ...024037288
ectoparasite infestations and canine infection by rickettsiae and ehrlichiae in a semi-arid region of northeastern brazil.this study investigated the prevalence of rickettsia spp. and ehrlichia canis infection in dogs and their ectoparasites from rural and urban areas of two municipalities, petrolina and juazeiro, within a semiarid region (caatinga biome) of northeastern brazil, by immunofluorescence assay (ifa) and polymerase chain reaction (pcr). overall, 12.1% (61/504) and 23.0% (116/504) of canine plasma samples had antibodies reactive to rickettsia spp. and e. canis. e. canis dna was detected by pcr in 8.3% (4 ...026565771
tick-borne rickettsial pathogens in questing ticks, removed from humans and animals in mexico.tick-borne rickettsial diseases (tbrd) are commonly encountered in medical and veterinary clinical settings. the control of these diseases is difficult, requiring disruption of a complex transmission chain involving a vertebrate host and ticks. the geographical distribution of the diseases is related to distribution of the vector, which is an indicator of risk for the population. a total of 1107 were collected by tick drag from forests, ecotourism parks and hosts at 101 sites in 22 of the 32 sta ...026726019
rickettsia parkeri rickettsiosis, arizona, usa.in the united states, all previously reported cases of rickettsia parkeri rickettsiosis have been linked to transmission by the gulf coast tick (amblyomma maculatum). here we describe 1 confirmed and 1 probable case of r. parkeri rickettsiosis acquired in a mountainous region of southern arizona, well beyond the recognized geographic range of a. maculatum ticks. the likely vector for these 2 infections was identified as the amblyomma triste tick, a neotropical species only recently recognized in ...027089251
distribution of ticks (acari: ixodidae) infesting domestic ruminants in mountainous areas of golestan province, iran.to determine the prevalence of ticks on cattle in the mountainous areas of golestan province and their geographical distribution.025183090
rickettsia typhi in rodents and r. felis in fleas in yucatán as a possible causal agent of undefined febrile cases.rickettsia typhi is the causal agent of murine typhus; a worldwide zoonotic and vector-borne infectious disease, commonly associated with the presence of domestic and wild rodents. human cases of murine typhus in the state of yucatán are frequent. however, there is no evidence of the presence of rickettsia typhi in mammals or vectors in yucatán. the presence of rickettsia in rodents and their ectoparasites was evaluated in a small municipality of yucatán using the conventional polymerase chain r ...025923891
forest refugia in western and central africa as 'museums' of mesozoic biodiversity.the refugial speciation model, or 'species pump', is widely accepted in the context of tropical biogeography and has been advocated as an explanation for present species distributions in tropical western and central africa. in order to test this hypothesis, a phylogeny of the cryptic arachnid order ricinulei, based on four nuclear and mitochondrial dna markers, was inferred. this ancient clade of litter-dwelling arthropods, endemic to the primary forests of western and central africa and the neo ...023193047
frequency and distribution of rickettsiae, borreliae, and ehrlichiae detected in human-parasitizing ticks, texas, usa.to describe the presence and distribution of tickborne bacteria and their vectors in texas, usa, we screened ticks collected from humans during 2008-2014 for rickettsia, borrelia, and ehrlichia spp. thirteen tick species were identified, and 23% of ticks carried bacterial dna from at least 1 of the 3 genera tested.026811941
participation of ticks in the infectious cycle of canine visceral leishmaniasis, in teresina, piauí, brazil.in this study, we detected leishmania spp. infection in r. sanguineus collected from dogs that were naturally infected with l. (l.) infantum. we examined 35 dogs of both sexes and unknown ages. the infected dogs were serologically positive by the immunofluorescence antibody test (ifat), enzyme-linked immunosorbent assay (elisa), and quick test-dpp (dual path platform), as well as parasitological examination of a positive skin biopsy or sternal bone marrow aspiration. ten negative dogs were inclu ...025076429
candidatus rickettsia andeanae, a spotted fever group agent infecting amblyomma parvum ticks in two brazilian biomes.adult ticks of the species amblyomma parvum were collected from the vegetation in the pantanal biome (state of mato grosso do sul) and from horses in the cerrado biome (state of piauí) in brazil. the ticks were individually tested for rickettsial infection via polymerase chain reaction (pcr) targeting three rickettsial genes, glta, ompa and ompb. overall, 63.5% (40/63) and 66.7% (2/3) of a. parvum ticks from pantanal and cerrado, respectively, contained rickettsial dna, which were all confirmed ...024714968
spotted fever group rickettsia in the pampa biome, brazil, 2015-2016. 027767913
clustered cases of rickettsia sibirica mongolitimonae infection, france. 023460995
in vitro effect of the ethanolic extract of tephrosia vogelii on rhipicephalus sanguineus in abomey-calavi.ticks are vectors of several diseases, of which many are zoonosis transmissible to humans. the use of tephrosia leafs' extract as a low cost acaricide is spreading among farmers in central kenya.026101758
high prevalence of rickettsia africae variants in amblyomma variegatum ticks from domestic mammals in rural western kenya: implications for human health.tick-borne spotted fever group (sfg) rickettsioses are emerging human diseases caused by obligate intracellular gram-negative bacteria of the genus rickettsia. despite being important causes of systemic febrile illnesses in travelers returning from sub-saharan africa, little is known about the reservoir hosts of these pathogens. we conducted surveys for rickettsiae in domestic animals and ticks in a rural setting in western kenya. of the 100 serum specimens tested from each species of domestic r ...025325312
single genotype of anaplasma phagocytophilum identified from ticks, camargue, france. 023697386
tick-borne lymphadenopathy-like condition in an african woman in kenya.a 30-year-old african woman in kenya succumbed to severe swollen regional lymph nodes, development of painful boils and ulcer formation and rashes at specific tick-biting sites together with an intermittent fever and headache following repeated tick bites of rhipicephalus pulchellus. she later developed nuchal lymphadenopathy-like condition and an eschar with edematous margins at bitten sites. a sustained high fever and fatigue then followed. she became well after treatment with antibiotics and ...024497868
spotted fever group rickettsiae in questing ticks, central spain. 023763913
mitochondrial genomes suggest that hexapods and crustaceans are mutually paraphyletic.for over a century the relationships between the four major groups of the phylum arthropoda (chelicerata, crustacea, hexapoda and myriapoda) have been debated. recent molecular evidence has confirmed a close relationship between the crustacea and the hexapoda, and has included the suggestion of a paraphyletic hexapoda. to test this hypothesis we have sequenced the complete or near-complete mitochondrial genomes of three crustaceans (parhyale hawaiensis, squilla mantis and triops longicaudatus), ...016024395
rickettsia monacensis as cause of mediterranean spotted fever-like illness, italy. 022469314
anaplasma phagocytophilum infection in domestic animals in ten provinces/cities of china.a nationwide epidemiologic investigation of domestic animal infections has been conducted in nine provinces and one city during 2007-2010. serum samples from a total of 707 goats, 433 cattle, and 219 dogs were collected for detecting anaplasma phagocytophilum igg antibody by immunofluorescence assays and the average seroprevalences were 10.05% for dogs, 3.82% for goats, and 0.69% for cattle, respectively. a total of 472 goats, 201 cattle, 102 dog blood clots, and 1,580 ticks were collected for p ...022764312
asymptomatic petechial eruption on the lower legs.the authors report an unusual case of rocky mountain spotted fever that presented as an asymptomatic petechial eruption on the lower legs. rocky mountain spotted fever is rare in new england and, as such, is typically not on the differential diagnosis when presented with such patients. what began as an asymptomatic eruption progressed to more classic signs of the disease, including a positive rocky mountain spotted fever titer. the patient was successfully treated with doxycydine and within a sh ...024062875
fatal monocytic ehrlichiosis in woman, mexico, 2013.human monocytic ehrlichiosis is a febrile illness caused by ehrlichia chaffeensis, an intracellular bacterium transmitted by ticks. in mexico, a case of e. chaffeensis infection in an immunocompetent 31-year-old woman without recognized tick bite was fatal. this diagnosis should be considered for patients with fever, leukopenia, thrombocytopenia, and elevated liver enzyme levels.027088220
genome sequence of rickettsia conorii subsp. israelensis, the agent of israeli spotted fever.rickettsia conorii subsp. israelensis is the agent of israeli spotted fever. the present study reports the draft genome of rickettsia conorii subsp. israelensis strain istt cdc1, isolated from a rhipicephalus sanguineus tick collected in israel.022933760
molecular investigation of hemotropic mycoplasmas in human beings, dogs and horses in a rural settlement in southern brazil.the aims of this study were to determine the prevalence of hemoplasmas in a rural brazilian settlement's population of human beings, their dogs and horses, highly exposed to tick bites; to identify the tick species parasitizing dogs and horses, and analyze factors associated with their infection. blood samples from 132 dogs, 16 horses and 100 humans were screened using a pan-hemoplasma sybr green real-time pcr assay followed by a species-specific taqman real-time pcr. a total of 59/132 (44.7%) d ...026422162
morphology, epidemiology, and phylogeny of babesia: an overview.babesiosis is a tick-borne hemoprotozoan disease of domestic and wild animals. the disease is caused by various species of babesia and some species of babesia have also zoonotic significance. the parasite in vertebrate hosts' remains in erythrocytes and the morphology of babesia spp. is not uniform in all vertebrate hosts. with the advancement of science, particularly the use of molecular techniques made it easy to study the evolution of parasites and thereby reclassifying babesia spp. as per th ...026629451
genome sequence of rickettsia conorii subsp. indica, the agent of indian tick typhus.rickettsia conorii subsp. indica is the agent of indian tick typhus. the present study reports the draft genome of rickettsia conorii subsp. indica strain ittr (atcc vr-597).022628514
multiple live subconjunctival dipetalonema: report of a case.parasitic infestations of the eye have been reported since centuries, affecting various parts of the eye. some are subtle, coexisting with vision, while many others damage and destroy, in part or totally, the gift of sight. this report describes a patient with live subconjunctival dipetalonema infestation of the right eye, with 22 parasites removed live in one sitting from one eye.022569390
trends in clinical diagnoses of rocky mountain spotted fever among american indians, 2001-2008.american indians are at greater risk for rocky mountain spotted fever (rmsf) than the general u.s. population. the epidemiology of rmsf among american indians was examined by using indian health service inpatient and outpatient records with an rmsf international classification of diseases, ninth revision, clinical modification diagnosis. for 2001-2008, 958 american indian patients with clinical diagnoses of rmsf were reported. the average annual rmsf incidence was 94.6 per 1,000,000 persons, wit ...022232466
intravascular hemolysis associated with candidatus mycoplasma hematoparvum in a non-splenectomized dog in the south region of iran.a 2-year-old male pekingese dog was referred to shiraz university's veterinary teaching hospital for anorexia and depression. the case had no history of surgery. physical examination revealed no abnormalities except mild depression and fever. small, coccoid, epicellular bacteria were detected on erythrocytes by microscopic examination of the giemsa-stained blood smears. abnormalities noted in the complete blood count included regenerative anemia characterized by a marked reticulocytosis. examina ...025568726
general properties and phylogenetic utilities of nuclear ribosomal dna and mitochondrial dna commonly used in molecular systematics.to choose one or more appropriate molecular markers or gene regions for resolving a particular systematic question among the organisms at a certain categorical level is still a very difficult process. the primary goal of this review, therefore, is to provide a theoretical information in choosing one or more molecular markers or gene regions by illustrating general properties and phylogenetic utilities of nuclear ribosomal dna (rdna) and mitochondrial dna (mtdna) that have been most commonly used ...010634037
transovarial transmission of babesia ovis by rhipicephalus sanguineus and hyalomma marginatum.rhipicephalus sanguineus and hyalomma marginatum are the most common species in sheep herds in northeast of iran. there is preliminary evidence that these species may be the vectors of babesia ovis in iran. we carried out two experiments in mashhad area, khorasan razavi province to determine whether b. ovis could be transovarially transmitted by r. sanguineus and h. marginatum.022347253
in vitro repellency of deet and β-citronellol against the ticks rhipicephalus sanguineus sensu lato and amblyomma sculptum.rhipicephalus sanguineus sensu lato and amblyomma sculptum can parasite humans and domestic animals and are vectors of pathogens, including zoonoses. repellents are an important tool of tick control. this study aimed to compare the efficacy of n,n-diethyl- 3-methylbenzamide (deet), a standard repellent, versus β-citronellol in a petri dish bioassay. a semicircle of filter paper (31.8cm(2)) was treated with 87μl of one of four concentrations (0.200, 0.100, 0.050 and 0.025mg/cm(2)) of β-citronello ...028495195
efficacy of tagetes minuta (asteraceae) essential oil against rhipicephalus sanguineus (acari: ixodidae) on infested dogs and in vitro.ticks from rhipicephalus sanguineus complex are widely distributed in the world and one species from this complex is the most common tick on dogs in brazil, notably in urban areas. this tick is a vector of several diseases. among others it transmits the agent of canine ehrlichiosis, a major dog infectious disease and the agent of rocky mountain spotted fever. this tick can spread rapidly and develop intolerable infestations within no time. currently tick control is done with acaricides and deman ...027815656
the distribution of rickettsia in the tissues of insects and arachnids.in the absence of a satisfactory definition of rickettsia the observations herein recorded were arbitrarily limited to bacterium-like organisms which are intracellular and gram-negative. rickettsia of this type were found in the following species: amblyomma americana, amblyomma hebraeum, boophilus decoloratus, atomus sp., casinaria infesta, chrysopa oculata, ctenocephalus canis, dermacentor variabilis, lepisma saccharina, lucoppia curviseta, margaropus annulatus, margaropus annulatus australis, ...192319868737
the ticks of rodents and their nests, and the discovery that rhipicephalus sanguineus latr. is the vector of tropical typhus in kenya. 193520475254
the brown dog tick, with special reference to its control and eradication. 194521009482
the white rat and guinea pig as hosts for the larvae of the brown dog tick, rhipicephalus sanguineus. 194720271946
spontaneous infection of the brown dog tick, rhipicephalus sanguineus with coxiella burnetii. 194918148515
transmission of a nuttallia of a gerbil by rhipicephalus sanguineus. 195214929242
the isolation of coxiella burnetii from rhipicephalus sanguineus on naturally infected dogs. 195313022569
[various biological data on rhipicephalus sanguineus latreille, 1806, transmitter of spotted fever in north & northeast mexico]. 195613453996
brown dog tick. 195813522465
the insecticide-resistance problem: a review of developments in 1956 and 1957.the author reviews the growth of the insecticide-resistance problem throughout the world during the period between july 1956 and november 1957, and the developments in research on the subject during the same period.three new resistant species have been discovered-anopheles subpictus, chrysomyia putoria and rhipicephalus sanguineus-and eight new types of resistance in already resistant species have been observed. moreover, the geographical area covered by certain resistant insect populations has ...195813536795
[some experiments onthepossible role as virus transmittor and reservoir of the tick rhipicephalus sanguineus latreille in myxomatosis]. 196113869785
[on the tick rhipicephalus sanguineus latr.--the vector of marseilles fever]. 19664241249
isolation of a virus (wad medani) from rhipicephalus sanguineus collected in sudan. 19665901632
physical and biological factors affecting the longevity and oviposition of engorged rhipicephalus sanguineus female ticks. 19676022398
mechanical removal of rhipicephalus sanguineus from the dog. 19685691640
[distribution and biology of tick rhipicephalus sanguineus latr. in the crimea]. 19685734364
[on the occurrence of rhipicephalus sanguineus (latreille 1806) in germany]. 19685756446
comparative changes in external respiration rates of engorged rhipicephalus sanguineus female ticks with age and oviposition in different physical environments. 19685757660
neutrophils: their role in the formation of a tick feeding lesion.dogs infested with adtult rhipicephalus sanguineus were given nitrogen mustard to reduce leukocyte numbers. in the treated animals the tick lesions were insignificant, lacking the collagen destruiction found in untreated hosts, bitt the ticks engorged normally. feeding results from tick secretions causing vascitlar trauima and is independent of tissute damage associated with inflammatory responses.19705411168
[existence of the brown dog tick, rhipicephalus sanguineus, in denmark]. 19705468580
changing infestation rates of rhipicephalus sanguineus (latreille) (ixodidae) ticks on dogs on singapore island, 1965-1966. 19715554999
survival of rickettsia conori in nymphal rhipicephalus sanguineus ticks at different temperatures. 19715159249
rhipicephalus sanguineus: amino acid composition of egg shell. 19715167722
insecticides tested for control of nymphal brown dog ticks by the "tea-bag" technique. 19725008960
hormonal rupture of larval diapause in the tick rhipicephalus sanguineus (lat.). 19725045164
[immune reaction in rabbits and guinea pigs during repeated feeding on them of ixodid ticks rhipicephalus sanguineus (latr., 1806)]. 19725055829
cytogenetics of ticks (acari: txodoidea). 9. chromosomes of rhipicephalus sanguineus (latreille) and effects of gamma radiation on spermatogenesis. 19725057239
testing acaricide susceptibility of the brown dog tick, rhipicephalus sanguineus (latreille, 1806), with a disposable pipette method. 19734213418
transmission of haemobartonella canis by the dog tick, rhipicephalus sanguineus. 19734736045
[epizootics due to rhipicephalus sanguineus (latreille 1806) in germany]. 19734751659
fumigants for quarantine control of the adult brown dog tick: laboratory studies. 19734770951
rhipicephalus sanguineus: sequential histopathology at the host-arthropod interface. 19744846421
morphological variability, host range and distribution of ticks of the rhipicephalus sanguineus complex in israël. 19744440994
testing acaricide susceptibility of the brown dog tick rhipicephalus sanguineus (latreille, 1806). ii teabag method. 19744220144
rhipicephalus sanguineus: vector of a new spotted fever group rickettsia in the united states.a rickettsia related to but distinct from the spotted fever agent, rickettsia rickettsii, has been detected in 167 (18.9%) of 884 rhipicephalus sanguineus taken off dogs in central and northern mississippi. the organisms could readily be isolated in male meadow voles (microtus pennsylvanicus), where it produced massive infections in the tissues of tunica vaginalis. it was practically nonpathogenic for male guinea pigs, although inoculation of these animals with infected tunica vaginalis of voles ...1975806533
rocky mountain spotted fever (tick-borne typhus) in south carolina: an educational program and tick/rickettsial survey in 1973 and 1974.because the incidence of spotted fever is increasing in south carolina, campaigns were carried out in 1973 and 1974 to provide the public and medical practitioners, through pamphlets and news media, with information about spotted fever and the ticks which transmit the causative agent, rickettsia rickettsii. people were also invited to save and submit live ticks removed from vegetation, animals and humans, for examination by the hemolymph test. a total of 1,186 ticks consisting of 987 dermacentor ...1975811127
letter: the brown dog tick (rhipicephalus sanguineus) on an imported dog. 19751060961
transmission of ehrlichia canis to dogs by ticks (rhipicephalus sanguineus).two strains of rhipicephalus sanguineus acquired ehrlichia canis by feeding as either larvae or nymphs on acutely infected dogs and, in subsequent instars, transmitted the agent to normal dogs. three strains of r sanguineus transmitted e canis as adults after their larval and nymphal stages fed on infected dogs. more than 400 adult female ticks were fed on infected dogs as larvae or nymphs or both, but none transmitted e canis transovarially.19751147359
the control of ticks, fleas and lice on dogs by means of a sendran--impregnated collar.plastic collars impregnated with 9,4% sendran effectively controlled adult rhipicephalus sanguineus for a period of 49 days and immature ticks for a period possibly in excess of 70 days when fitted to four dogs. four uncollared dogs served as controls. although flea burdens were extremely low the collars were apparently effective for a period in excess of 70 days. a medicated collar killed all the ticks, fleas and lice on a severely parasited dog within a period of 48 hours.19761263190
evaluation of the efficacy of fospirate-treated collars against the brown dog tick.experimental tick infestations on dogs were done to determine the initial kill and residual effectiveness of a 15% fospirate-treated plastic colar against the brown dog tick, rhipicephalus sanguineus (latreille). the mean initial kill, determined 4 days after collar application (day 4), was 56.4%. the mean residual effectiveness of fospirate collars on test days 18, 33, 45, 61, 74, 88, and 112 was 89.1, 77.4, 89.5, 78.6, 73.2, 69.0, and 55.0% control, respectively.1976984550
extension of the range of rhipicephalus sanguineus in western australia. 19761016172
the first record of hunterellus hookeri parasitizing rhipicephalus sanguineus in indonesia. 19761025747
[new faunal and biological observations on ticks in abruzzo].ticks collected during the years 1975-76 in abruzzo (prov. l'aquila and chieti) italy are reported. the following species have been identified: ixodes canisuga, ixodes frontalis, ixodes hexagonus, ixodes ricinus, dermacentor marginatus, haemaphysalis sulcata, rhipicephalus bursa, rhipicephalus sanguineus, hyalomma marginatum. new hosts are: felis catus for ixodes canisuga; scolopax rusticola, motacilla flava, corvus cornix for ixodes frontalis; sciurus vulgaris for haemaphysalis punctata; garrul ...19761032325
rocky mountain spotted fever in mississippi: survey for spotted fever antibodies in dogs and for spotted fever group reckettsiae in dog ticks.during epidemiologic studies of rocky mountain spotted fever in mississippi in 1973, dogs were surveyed for antibodies tp spotted fever group antigens and for tick parasites infected with rickettsiae of the spotted fever group. fifty-three (46%) of 116 serum samples had complement-fixing antibody titers greater than or equal to 1:8 as compared to only one (5%) of 21 samples from a group of dogs obtained from metropolitan chicage. fifty-two per cent of the dogs tested from mississippi had microag ...1976814809
development of ehrlichia canis, causative agent of canine ehrlichiosis, in the tick rhipicephalus sanguineus and its differentiation from a symbiotic rickettsia.certain aspects of the development of ehrlichia canis, causative agent of canine ehrlichiosis (tropical canine pancytopenia) in rhipicephalus sanguineus ticks were studied. it was found that partial feeding of nymphs infected as larvae with e canis was a desirable, if not necessary, preliminary treatment for successful infection of dogs with ground-up ticks. it remains unclear whether feeding increased the number or altered the virulence of ehrlichiae within tick tissues. ehrlichia canis organis ...1976944000
changes in lymphatic fluid draining an area of inflammation induced by feeding rhipicephalus sanguineus (acarina: ixodidae) on the dog. 1976940125
histamine blocking agent in the salivary gland homogenate of the tick rhipicephalus sanguineus sanguineus. 1977834285
possibilities of persistence in new biotopes of ticks imported by birds.survival and development of 6 tick species (hyalomma anatolicum, rhipicephalus sanguineus, haemaphysalis punctata, dermacentor marginatus, d. reticulatus and ixodes ricinus) were studied in 3 groups differing in the range of distribution with respect to the place of importation, as a model for the knowledge of their possible inclusion in the new local biocenosis during transportation by natural hosts.1977852771
the brown dog tick rhipicephalus sanguineus and the dog as experimental hosts of ehrlichia canis.adult rhipicephalus sanguineus ticks efficiently transmitted ehrlichia canis to susceptible dogs for 155 days after detachment as engorged nymphs from a dog in the acute phase of ehrlichiosis. adult ticks that had similarly engorged on a dog in the chronic phase of ehrlichiosis failed to transmit e canis to susceptible dogs. infected but unfed adult ticks may be of greater importance than the chronically infected carrier dog as a natural reservoir of e canis.1977596693
[attempts to infect rhipicephalus sanguineus (latr.) ticks with the rabies virus]. 1978672778
preparation of primary cultures of tick cells.primary cell cultures were prepared from preimaginal bodies from the nymphal ticks, rhipicephalus sanguineus, dermacentor andersoni, and amblyomma maculatum, and from the hemocytes of late-stage nymphal and adult ticks, ornithodoros coriaceus. the dissection methods for obtaining preimaginal bodies and hemocytes for culture are described. a culture mediu, designated rml 375, was used for both culture methods. primary cultures were established with minimal contamination. preimaginal body cultures ...1978697169
ultrastructure of rickettsia rhipicephali, a new member of the spotted fever group rickettsiae in tissues of the host vector rhipicephalus sanguineus.rickettsia rhipicephali is similar in ultrastructure to r. rickettsii while differing from other rickettsiae of the typhus group and of q fever and others by its lack of a prominently reticulated cytoplasmic matrix and in the thickness of the inner osmophilic layer of the cell wall. in tissues of the tick vector rhipicephalus sanguineus, r. rhipicephali had a mean length and width of 1.2 and 0.46 micrometer, respectively. it possessed a trilaminar cell wall with an adhering capsule-like layer. t ...1979570191
epidemiology and control of anaplasmosis in australia.anaplasmosis occurs in those areas of northern and eastern australia infested by the cattle tick boophilus microplus but it has been studied intensively only in queensland. anaplasmosis is predominantly a disease of autumn and winter and of cattle greater than 1 year of age. the complement fixation test has been used in serological surveys of the tick-infested areas of the state. both clinical and subclinical infections occur only in tick-infested areas and they are both more frequent in bos tau ...1979553977
[case of mass infestation with mites of genus rhipicephalus sanguineus (latreile, 1806) in a warsaw apartment]. 1979516736
[experimental transmission of canine babesiosis (babesia canis) by native german ticks: 1. the brown dog tick (rhipicephalus sanguineus) (author's transl)]. 1979374029
ehrlichiosis in wolves, dogs, and wolf-dog crosses.canine ehrlichiosis was diagnosed in wolves, dogs, and wolf-dog crosses at a small zoo in northcentral florida. five of 9 adult canids and all 8 pups confined to a common kennel died as a result of the infection. the epizootic was associated with a massive rhipicephalus sanguineus infestation. hematologic and pathologic findings in an adult wolf-dog cross that died were characteristic of canine ehrlichiosis. that animal and four other canids were seropositive for ehrlichia canis. no deaths occur ...1979521367
hosts of rhipicephalus sanguineus (acari: ixodidae) in northern mississippi, usa. 1979529267
[the experimental transmission of anaplasma marginale by the brown dog tick rhipicephalus sanguineus in australia]. 1979539952
[the brown dog tick rhipicephalus sanguineus (latreille, 1806) in germany, a problem in small animal practice]. 1979548027
[control of the brown dog tick rhipicephalus sanguineus l. in houses and stables]. 1979548028
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