report on ticks collected in the southeast and mid-west regions of brazil: analyzing the potential transmission of tick-borne pathogens to man.specimens of ticks were collected in 1993, 1996, 1997, and 1998, mostly from wild and domestic animals in the southeast and mid-west regions of brazil. nine species of amblyommidae were identified: anocentor nitens, amblyomma cajennense, amblyomma ovale, amblyomma fulvum, amblyomma striatum, amblyomma rotundatum, boophilus microplus, boophilus annulatus, and rhipicephalus sanguineus. the potential of these tick species as transmitters of pathogens to man was analyzed. a flaviviridade flavivirus ...199910881097
ticks (acari: ixodidae) associated with rural dogs in uruará, eastern amazon, brazil.a survey of 124 dogs for ticks was conducted from august to november 1998 in 68 small farms of uruará municipality in eastern amazon-brazil. we collected 55 ticks from 18 dogs (14.5%). amblyomma oblongoguttatum koch, amblyomma ovale koch, and amblyomma cajennense (f.) were found on nine, six, and one dog, respectively. fourteen small farms (20.5%) had at least one dog with ticks.200011004794
evidence of spotted fever group rickettsiae in state of rio de janeiro, brazil.ticks were obtained from dogs from february to september of 1999 at weekly intervals, in the county of piraí, state of rio de janeiro. four hundred seventy four ixodids were taxonomically identified, 103 amblyomma cajennense, seven amblyomma ovale, 209 rhipicephalus sanguineus, and 155 amblyomma sp. an hemolymph test associated with giemsa's stain revealed two specimens in 163 ticks tested (r. sanguineus and amblyomma sp), containing rickettsia-like organisms. direct immunofluorescence verified ...200212163909
ticks (acari: ixodidae) associated with domestic dogs in franca region, são paulo, brazil.ticks on 140 domestic dogs from both urban and rural areas of franca region in são paulo state were identified with 102 dogs from urban areas and 38 from rural areas. of urban dogs, 27.5% were infested exclusively by rhipicephalus sanguineus ticks. of the rural dogs, 36.8% were infested with the following tick species: r. sanguineus, boophilus microplus, amblyomma ovale and a. cajennense. mixed infestations included a dog hosting a. cajennense and a. ovale and another with b. microplus and r. sa ...200112455880
amblyomma aureolatum (pallas, 1772) and amblyomma ovale koch, 1844 (acari: ixodidae): hosts, distribution and 16s rdna sequences.dna sequences of amblyomma aureolatum (pallas, 1772) and amblyomma ovale koch, 1844 were obtained to determine genetic differences between these tick species. collections of these species are discussed in relation to distribution and hosts. seven ticks collections (four from brazil, one from argentina, one from uruguay and one from usa) house a total of 1272 a. aureolatum (224 males, 251 females, 223 nymphs and 574 larvae) and 1164 a. ovale (535 males, 556 females, 66 nymphs and 7 larvae). the l ...200312719142
rickettsia bellii and rickettsia amblyommii in amblyomma ticks from the state of rondônia, western amazon, brazil.this study evaluates the rickettsial presence in amblyomma ticks from eight areas of the amazon forest in rondônia, brazil. the following tick species (number in parentheses) were examined: amblyomma ovale koch (121), amblyomma cajennense (f.) (41), amblyomma naponense (packard) (36), amblyomma scalpturatum neumann (35), amblyomma oblongoguttatum koch (30), amblyomma incisum neumann (27), amblyomma rotundatum koch (16), amblyomma coelebs neumann (10), and amblyomma humerale koch (6). ticks were ...200415605647
diagnosis of hepatozoon spp. in amblyomma ovale and its experimental transmission in domestic dogs in brazil.transmission of hepatozoon spp. to dogs was investigated using four species of ixodid ticks: rhipicephalus sanguineus, amblyomma aureolatum, amblyomma ovale and amblyomma cajennense. we collected completely or partially engorged adult ticks of these species from dogs that were naturally infested and positive for hepatozoon spp. we selected some of these ixodids and inoculated them orally in four negative dogs. the other ticks were dissected and examined for oocysts. of all dogs inoculated orally ...200516081219
ticks (acari: ixodida) on wild carnivores in brazil.the present study reports field data of ticks infesting wild carnivores captured from july 1998 to september 2004 in brazil. additional data were obtained from one tick collection and from previous published data of ticks on carnivores in brazil. during field work, a total of 3437 ticks were collected from 89 cerdocyon thous (crab-eating fox), 58 chrysocyon brachyurus (maned wolf), 30 puma concolor (puma), 26 panthera onca (jaguar), 12 procyon cancrivorus (crab-eating raccoon), 4 speothos venati ...200516082932
ticks (acari: ixodidae) parasitizing humans in an atlantic rainforest reserve of southeastern brazil with notes on host suitability.while conducting projects on ticks from deer and on tick ecology in animal trails in an atlantic rainforest reserve in southeastern brazil, researchers of our group were bitten by ticks several times. some of these episodes were recorded. three species of adult ticks attached to humans: amblyomma brasiliense aragão, amblyomma incisum neumann, and amblyomma ovale koch. eight nymphal attachments with engorgement on humans were recorded. from these, six molted to adults of a. incisum, one to an adu ...200616900313
isolation of rickettsia rhipicephali and rickettsia bellii from haemaphysalis juxtakochi ticks in the state of são paulo, the present study, attempts to isolate rickettsia in cell culture were performed individually in seven specimens of haemaphysalis juxtakochi ticks collected in the state of são paulo (southeastern brazil). rickettsia was successfully isolated by the shell vial technique and established in vero cell culture from six ticks (six isolates). dna extracted from infected cells of these isolates was tested by pcr and dna sequencing, using genus-specific rickettsia primers targeting the genes glta, ht ...200717142361
[occurrence of ticks (acari: ixodidae) in the municipality of goiatins, tocantins].due to a suspected human case of brazilian lyme-like disease in the city of goiatins, tocantins state, an epidemiological survey was carried out in eight counties in this region during september 2007 and february 2008, where 1,890 ticks were collected from domestic animals and from the environment. a total of eight tick species were identified: rhipicephalus sanguineus, rhipicephalus (boophilus) microplus, dermacentor nitens, amblyomma cajennense, amblyomma oblongoguttatum, amblyomma ovale, ambl ...200919602318
detection and identification of rickettsial agents in ticks from domestic mammals in eastern panama.several outbreaks of rocky mountain spotted fever have occurred in recent years in colombian communities close to the border with panama. however, little is known about rickettsiae and rickettsial diseases in eastern panamanian provinces, the darien province and the kuna yala, located north of the endemic area in colombia. in 2007, 289 ticks were collected in several towns from dogs, horses, mules, cows, and pigs. dna was extracted from 124 dermacentor nitens, 64 rhipicephalus sanguineus, 43 amb ...200919645289
ticks (acari: ixodidae) infesting birds in an atlantic rain forest region of brazil.brazil has the third richest bird diversity of the world; however, there are few data concerning ticks (acari: ixodidae) parazitizing birds. the aim of the study was to report tick infestations on wild birds from an atlantic rain forest region of brazil. during 2 yr, ticks were collected from birds and from the environment in 12 forest sites. a total of 1,725 birds were captured representing 80 species from 24 families. in total, 223 (13%) birds were found infested by immature stages of amblyomm ...200919769058
ticks on domestic animals in pernambuco, northeastern brazil.the objective of this article was to discuss some aspects of ticks associated with domestic animals in the state of pernambuco, northeastern brazil, based on a literature review and present new data obtained from recent tick collections carried out in this northeastern brazilian state. from august 2007 to june 2008, 1,405 ticks were collected and five species were identified: amblyomma cajennense (fabricius, 1787), amblyomma ovale koch, 1844, dermacentor nitens neumann, 1897, rhipicephalus (boop ...200919772771
ectoparasite infestation on rural dogs in the municipality of são vicente férrer, pernambuco, northeastern brazil.this article presents the results of a study on ectoparasites infesting rural dogs in pernambuco, northeastern brazil. forty-one dogs from a rural community of pernambuco were examined and 70.7% were infested by ectoparasites. the prevalence rates of infestation by ticks, fleas, and lice were 58.5, 43.9 and 22%, respectively. of 24 dogs parasitized by ticks, 15 were exclusively infested by rhipicephalus sanguineus (latreille) (32 females, 66 males, 9 nymphs; prevalence, 48.8%; mean intensity, 5. ...200919772781
wide dispersal and possible multiple origins of low-copy-number plasmids in rickettsia species associated with blood-feeding arthropods.plasmids are mobile genetic elements of bacteria that can impart important adaptive traits, such as increased virulence or antibiotic resistance. we report the existence of plasmids in rickettsia (rickettsiales; rickettsiaceae) species, including rickettsia akari, "candidatus rickettsia amblyommii," r. bellii, r. rhipicephali, and reis, the rickettsial endosymbiont of ixodes scapularis. all of the rickettsiae were isolated from humans or north and south american ticks. r. parkeri isolates from b ...201020097813
biology and ecology of the brown dog tick, rhipicephalus sanguineus.abstract: the brown dog tick (rhipicephalus sanguineus) is the most widespread tick in the world and a well-recognized vector of many pathogens affecting dogs and occasionally humans. this tick can be found on dogs living in both urban and rural areas, being highly adapted to live within human dwellings and being active throughout the year not only in tropical and subtropical regions, but also in some temperate areas. depending on factors such as climate and host availability, rh. sanguineus can ...201020377860
canine vector-borne diseases in brazil.abstract: canine vector-borne diseases (cvbds) are highly prevalent in brazil and represent a challenge to veterinarians and public health workers, since some diseases are of great zoonotic potential. dogs are affected by many protozoa (e.g., babesia vogeli, leishmania infantum, and trypanosoma cruzi), bacteria (e.g., anaplasma platys and ehrlichia canis), and helminths (e.g., dirofilaria immitis and dipylidium caninum) that are transmitted by a diverse range of arthropod vectors, including tick ...200818691408
survey of ticks (acari: ixodidae) and their rickettsia in an atlantic rain forest reserve in the state of são paulo, brazil.the current study investigated the occurrence of ticks and their rickettsiae in the serra do mar state park, which encompasses one of the largest atlantic rain forest reserves of brazil. from july 2008 to june 2009, a total of 2439 ticks (2,196 free living and 243 collected on hosts) was collected, encompassing the following 13 species: amblyomma aureolatum (pallas), amblyomma brasiliense aragao, amblyomma dubitatum neumann, amblyomma fuscum neumann, amblyomma incisum neumann, amblyomma longiros ...201020939390
tick fauna from two locations in the brazilian savannah.the cerrado is brazil's tropical savannah, which is arguably under greater threat than the amazon rainforest. the cerrado biome of tropical south america covers about 2 million km(2) and is considered a biodiversity hot spot which means that it is especially rich in endemic species and particularly threatened by human activities. the cerrado is increasingly exposed to agricultural activities which enhance the likelihood of mixing parasites from rural, urban and wildlife areas. information about ...200717828441
ticks species (ixodida) in the summit municipal park and adjacent areas, panama city, panama.from september 2007 to september 2009, we studied the species of ticks present in the summit municipal park. ticks were extracted from zoo animals, free-living wild mammals and reptiles trapped, dead mammals on the roads and environment (ground and zoo burrows). a total of 2,649 ticks were collected: 2,167 immature stages (1,345 larvae and 822 nymphs) and 482 adults. seventeen species were identified: ornithodoros puertorricensis (argasidae), amblyomma auricularium, a. cajennense, a. calcaratum, ...201020585838
ticks (acari: ixodidae) associated with wild animals in the pantanal region of brazil.this paper describes the identification of ticks from wild animals of the pantanal region in brazil as part of a comprehensive study about established and emerging tick-host relationships and related pathological aspects. eighty-one animals were captured (representing 13 species, six orders), and ticks were found on 63 (78%). tick species identified included boophilus microplus (canestrini), amblyomma cajennense (f.), amblyomma parvum aragão, amblyomma pseudoconcolor aragão, amblyomma scalpturat ...200011126563
spotted fever group rickettsia infecting ticks (acari: ixodidae) in the state of santa catarina, brazil.during 2006-2008, a total of 260 adult ticks were collected from domestic and wild animals in different regions of the state of santa catarina (sc), brazil, including areas where human cases of brazilian spotted fever have been reported. collected ticks belonging to nine species (amblyomma aureolatum, amblyomma cajennense, amblyomma dubitatum, amblyomma longirostre, amblyomma ovale, amblyomma tigrinum, dermacentor nitens, rhipicephalus microplus and rhipicephalus sanguineus) were tested by polym ...201122241112
rickettsia bellii infecting amblyomma sabanerae ticks in el salvador.four amblyomma sabanerae ticks collected from a turtle (kinosternon sp.) in san miguel, el salvador, were found by molecular analysis to be infected by rickettsia bellii. we provide the first report of rickettsia bellii in central america, and the first report of a rickettsia species in el salvador.201223265378
wildlife reservoirs for vector-borne canine, feline and zoonotic infections in austria.austria's mammalian wildlife comprises a large variety of species, acting and interacting in different ways as reservoir and intermediate and definitive hosts for different pathogens that can be transmitted to pets and/or humans. foxes and other wild canids are responsible for maintaining zoonotic agents, e.g. echinococcus multilocularis, as well as pet-relevant pathogens, e.g. hepatozoon canis. together with the canids, and less commonly felids, rodents play a major role as intermediate and par ...201425830102
avian migrants facilitate invasions of neotropical ticks and tick-borne pathogens into the united states.migratory birds have the potential to transport exotic vectors and pathogens of human and animal health importance across vast distances. we systematically examined birds that recently migrated to the united states from the neotropics for ticks. we screened both ticks and birds for tick-borne pathogens, including rickettsia species and borrelia burgdorferi. over two spring seasons (2013 and 2014), 3.56% of birds (n = 3,844) representing 42.35% of the species examined (n = 85) were infested by ti ...201526431964
vector potential and population dynamics for amblyomma inornatum.we studied the natural life cycle of amblyomma inornatum and its vector potential in south texas. this tick is distributed throughout south texas and most of central america. a. inornatum represented 1.91% of the ticks collected by carbon dioxide traps during a study of free-living ticks in the tamaulipan biotic province in south texas. the life cycle of a. inornatum in south texas showed a clear seasonal pattern consistent with one generation per year. nymphs emerged in the spring with a peak i ...201525881916
investigation of tick-borne bacteria (rickettsia spp., anaplasma spp., ehrlichia spp. and borrelia spp.) in ticks collected from andean tapirs, cattle and vegetation from a protected area in ecuador.ixodid ticks play an important role in the transmission and ecology of infectious diseases. information about the circulation of tick-borne bacteria in ticks is lacking in ecuador. our aims were to investigate the tick species that parasitize andean tapirs and cattle, and those present in the vegetation from the buffer zone of the antisana ecological reserve and cayambe-coca national park (ecuador), and to investigate the presence of tick-borne bacteria.201525616567
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
molecular epidemiology of the emerging zoonosis agent anaplasma phagocytophilum (foggie, 1949) in dogs and ixodid ticks in brazil.anaplasma phagocytophilum is an emerging pathogen of humans, dogs and other animals, and it is transmitted by ixodid ticks. the objective of the current study was a) detect a. phagocytophilum in dogs and ixodid ticks using real-time polymerase chain reaction (qpcr); and b) determine important variables associated to host, environment and potential tick vectors that are related to the presence of a. phagocytophilum in dogs domiciled in rio de janeiro, brazil.201324330631
synanthropic mammals as potential hosts of tick-borne pathogens in panama.synanthropic wild mammals can be important hosts for many vector-borne zoonotic pathogens. the aim of this study was determine the exposure of synanthropic mammals to two types of tick-borne pathogens in panama, spotted fever group rickettsia (sfgr) and borrelia relapsing fever (rf) spirochetes. one hundred and thirty-one wild mammals were evaluated, including two gray foxes, two crab-eating foxes (from zoos), four coyotes, 62 opossum and 63 spiny rats captured close to rural towns. to evaluate ...201728060928
first identification and description of rickettsioses and q fever as causes of acute febrile illness in nicaragua.rickettsial infections and q fever present similarly to other acute febrile illnesses, but are infrequently diagnosed because of limited diagnostic tools. despite sporadic reports, rickettsial infections and q fever have not been prospectively studied in central america.201628036394
host body size and the diversity of tick assemblages on neotropical vertebrates.identifying the factors that influence the species diversity and distribution of ticks (acari: ixodida) across vertebrate host taxa is of fundamental ecological and medical importance. host body size is considered one of the most important determinants of tick abundance, with larger hosts having higher tick burdens. the species diversity of tick assemblages should also be greater on larger-bodied host species, but empirical studies testing this hypothesis are lacking. here, we evaluate this rela ...201627812506
host specificity in a diverse neotropical tick community: an assessment using quantitative network analysis and host specificity is a fundamental determinant of tick population and pathogen transmission dynamics, and therefore has important implications for human health. tick host specificity is expected to be particularly high in the tropics, where communities of ticks, hosts and pathogens are most diverse. yet the degree to which tropical tick species are host-specific remains poorly understood. combining new field data with published records, we assessed the specificity of tick-host associations in pan ...201627357506
ticks and rickettsiae from wildlife in belize, central america.the agents of spotted fevers in latin america are rickettsia rickettsii, r. parkeri, rickettsia sp. strain atlantic rainforest, and r. massiliae. in continental central america, r. rickettsii remains the only known pathogenic tick-borne rickettsia. in the present study, ticks were collected from wild mammals in natural areas of belize. besides providing new data of ticks from belize, we investigated rickettsial infection in some of these ticks. our results provide ticks harboring rickettsial age ...201626831147
brazilian spotted fever with an approach in veterinary medicine and one health perspective.there is increasing interaction between man and pathogens transmitted by arthropods, especially by ticks. it is on this background that a holistic approach stands out, for the sake of public health. brazilian spotted fever is an endemic disease at the country's southeast, with amblyomma sculptum as its major contributor, followed by a. aureolatum and potentially rhipicephalus sanguineus. dogs have been considered sentinels, and in some areas the disease in dogs can precede human disease. conside ...201626881183
first molecular evidence of hepatozoon canis infection in red foxes and golden jackals from hungary.recently, hepatozoon canis infection has been detected among shepherd, hunting and stray dogs in the southern part of hungary, which is considered to be free of rhipicephalus sanguineus sensu lato and close to the border with croatia. the aim of this study was to acquire information on the possibility that red foxes and/or golden jackals could play a role in the appearance and spread of h. canis in hungary.201424985073
risk factors for bartonella species infection in blood donors from southeast brazil.bacteria from the genus bartonella are emerging blood-borne bacteria, capable of causing long-lasting infection in marine and terrestrial mammals, including humans. bartonella are generally well adapted to their main host, causing persistent infection without clinical manifestation. however, these organisms may cause severe disease in natural or accidental hosts. in humans, bartonella species have been detected from sick patients presented with diverse disease manifestations, including cat scrat ...201626999057
dogs, cats, parasites, and humans in brazil: opening the black box.dogs and cats in brazil serve as primary hosts for a considerable number of parasites, which may affect their health and wellbeing. these may include endoparasites (e.g., protozoa, cestodes, trematodes, and nematodes) and ectoparasites (i.e., fleas, lice, mites, and ticks). while some dog and cat parasites are highly host-specific (e.g., aelurostrongylus abstrusus and felicola subrostratus for cats, and angiostrongylus vasorum and trichodectes canis for dogs), others may easily switch to other h ...201424423244
ecology, biology and distribution of spotted-fever tick vectors in brazil.spotted-fever-caused rickettsia rickettsii infection is in brazil the major tick-borne zoonotic disease. recently, a second and milder human rickettsiosis caused by an agent genetically related to r. parkeri was discovered in the country (atlantic rainforest strain). both diseases clearly have an ecological background linked to a few tick species and their environment. capybaras (hydrochoerus hydrochaeris) and amblyomma cajennense ticks in urban and rural areas close to water sources are the mai ...201323875178
molecular ecological insights into neotropical bird-tick the tropics, ticks parasitize many classes of vertebrate hosts. however, because many tropical tick species are only identifiable in the adult stage, and these adults usually parasitize mammals, most attention on the ecology of tick-host interactions has focused on mammalian hosts. in contrast, immature neotropical ticks are often found on wild birds, yet difficulties in identifying immatures hinder studies of birds' role in tropical tick ecology and tick-borne disease transmission. in panama ...201627203693
contributions to rickettsioses research in colombia (1917-1943), luis b. patiño camargo.colombian physician luis benigno patiño camargo was one of the pioneers in the study of rickettsioses in south america, demonstrating for the first time in colombia the presence of rickettsia rickettsii as the etiological agent of a highly deadly exanthematic febrile syndrome in the 1930s. however, patiño-camargo performed other investigations from 1917-1943, which represent the first descriptions and scientific evidence of the presence of r. prowazekii and r. typhi in colombia. almost 60 years ...201627074327
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
a survey of tick-borne pathogens in dogs and their ticks in the pantanal biome, brazil.tick and blood samples collected from domestic dogs in the brazilian pantanal were tested by molecular methods for the presence of tick-borne protozoa and bacteria. among 320 sampled dogs, 3.13% were infected by babesia vogeli (piroplasmida: babesiidae), 8.75% by hepatozoon canis (eucoccidiorida: hepatozoidae), 7.19% by anaplasma platys (rickettsiales: anaplasmataceae), and 0.94% by an unclassified anaplasma sp. in three tick species collected from dogs, the following tick-borne agents were dete ...201626467462
vector-borne pathogens in dogs from costa rica: first molecular description of babesia vogeli and hepatozoon canis infections with a high prevalence of monocytic ehrlichiosis and the manifestations of co-infection.infection with canine vector-borne pathogens was evaluated in dogs from four different regions of costa rica by pcr. demographic data, clinical signs, packed cell volume values, and the presence of tick infestation were recorded for each dog. forty seven percent (69/146) of the dogs were infected with at least one pathogen and 12% were co-infected with two pathogens. ehrlichia canis was detected in 34%, anaplasma platys in 10%, babesia vogeli in 8%, and hepatozoon canis in 7.5% of the blood samp ...201424315693
serosurvey of borrelia in dogs, horses, and humans exposed to ticks in a rural settlement of southern brazil.the aims of the present study were to serosurvey dogs, horses, and humans highly exposed to tick bites for anti-borrelia burgdorferi s.l. antibodies, identify tick species present, and determine risk factors associated with seropositivity in a rural settlement of paraná state, southern brazil. eighty-seven residents were sampled, along with their 83 dogs and 18 horses, and individual questionnaires were administered. immunofluorescence antibody test (ifat) was performed on serum samples and posi ...201627982299
ticks (acari: ixodidae) on dogs from uberlândia, minas gerais, brazil.uberlândia in minas gerais state, southeastern brazil, has 622 000 inhabitants and is located in the cerrado biome, the south american savannah. the city dog population is estimated at 82 000 and identification of tick species and infestation prevalence on this host has not been determined. a major infectious disease of dogs in the city, canine ehrlichiosis, is transmitted by rhipicephalus sanguineus ticks. at the same time, autochthonous leishmaniosis has been recently described in the city and ...201020537111
a serological and molecular survey of babesia vogeli, ehrlichia canis and rickettsia spp. among dogs in the state of maranhão, northeastern brazil.this study evaluated exposure and infection by tick-borne agents (babesia vogeli, ehrlichia canis and rickettsia spp.) in 172 dogs in rural areas and 150 dogs in urban areas of the municipality of chapadinha, state of maranhão, northeastern brazil, using molecular and serological methods. overall, 16.1% of the sampled dogs (52/322) were seroreactive to b. vogeli, with endpoint titers ranging from 40 to 640. for e. canis, 14.6% of the dogs (47/322) were seroreactive, with endpoint titers from 80 ...201525909250
investigation of tick vectors of hepatozoon canis in brazil.hepatozoon canis is a common apicomplexan parasite of dogs. in brazil, in addition to rhipicephalus sanguineus, amblyomma ovale, amblyomma cajennense, and rhipicephalus (boophilus) microplus have been suggested to act as vectors. the present study aimed to evaluate, under controlled conditions, the acquisition of h. canis by a. ovale, r. sanguineus, and a. cajennense after feeding on naturally infected dogs. cytological and histophatological examinations were performed to recover oocysts and oth ...201324209494
rickettsial infection in ticks (acari: ixodidae) collected on birds in southern brazil.the aim of the study was to evaluate rickettsial infection in ticks from wild birds of the semidecidual and atlantic rainforest remnants of three municipalities of the state of paraná, southern brazil. overall, 53 larvae and nymphs collected from birds were checked for the presence of rickettsia dna by molecular tests. five tick species were tested: amblyomma aureolatum (pallas), amblyomma calcaratum neumann, amblyomma longirostre (koch), amblyomma ovale koch, and amblyomma parkeri fonseca and a ...201222679880
bacteria of the genera ehrlichia and rickettsia in ticks of the family ixodidae with medical importance in argentina.the aim of this study was to get an overview about the occurrence of bacteria from the genus ehrlichia and rickettsia in ixodid ticks with medical importance in argentina. therefore, in 2013 and 2014, free-living ticks were collected in different provinces of northern argentina. these ticks were determined as amblyomma sculptum, amblyomma neumanni, amblyomma parvum, amblyomma triste, amblyomma ovale, amblyomma tonelliae and haemaphysalis juxtakochi. all samples were tested to determine the infec ...201727812828
microorganisms in ticks (acari: ixodidae) collected on marsupials and rodents from santa catarina, paraná and mato grosso do sul states, brazil.information about tick fauna and monitoring of pathogen prevalences in ticks (acari: ixodidae) in various habitat types can enhance knowledge about the epidemiology of tick-borne pathogens in brazil. this work shows the results of a study of tick parasitism of wild rodents and marsupials collected in seven localities in the southern part of brazil, within atlantic forest and cerrado biomes. a total of 61 ticks were collected from small mammals, and after identification to the species level, the ...201727769655
detection of rickettsiae in fleas and ticks from areas of costa rica with history of spotted fever group rickettsioses.outbreaks of spotted fevers have been reported in costa rica since the 1950s, although vectors responsible for transmission to humans have not been directly identified. in this study, species of rickettsia were detected in ectoparasites from costa rica, mostly from five study sites where cases of spotted fevers have been reported. ticks and fleas were collected using drag cloths or directly from domestic and wild animals and pooled according to species, host, and location. pools were analyzed in ...201627592065
[parasites of the central american tapir tapirus bairdii (perissodactyla: tapiridae) in chiapas, mexico].we analyzed 19 samples of baird's tapir feces from la sepultura biosphere reserve, collected between march and july 1999. we also took samples directly from a male tapir captured at the montes azules biosphere reserve. both reserves are in chiapas, mexico. we used five techniques: flotation, macmaster, micrometric, ritchie's sedimentation and ferreira's quantitative. in addition, we collected ectoparasites from animals captured in both reserves and from a captive couple from tuxtla gutierrez, ch ...200618494314
hepatozoon canis infection associated with dog ticks of rural areas of rio de janeiro state, brazil.hepatozoon canis is a tick-borne protozoan that infects dogs and has been reported throughout the world. manifestation of h. canis infection varies from being sub-clinical in apparently healthy dogs to severe illness. the main vector of the infection is the dog tick, rhipicephalus sanguineus although other species may also transmit this agent. h. canis has been reported previously in brazil, but mostly as an occasional finding during laboratory exams and always associated with other diseases. th ...200111113545
diagnosis of hepatozoon canis in young dogs by cytology and pcr.abstract:201121489247
rickettsia (rickettsiales: rickettsiaceae) vector biodiversity in high altitude atlantic forest fragments within a semiarid climate: a new endemic area of spotted-fever in brazil.rickettsioses are re-emerging vector-borne zoonoses with a global distribution. recently, rickettsia sp. strain atlantic rainforest has been associated with new human spotted-fever (sf) cases in brazil, featuring particular clinical signs: eschar formation and lymphadenopathy. these cases have been associated with the tick species, amblyomma ovale from 2010 until 2015, the brazilian health department confirmed 11 human sf cases in the maciço de baturité region, ceará, brazil. the present study r ...201627480099
Life-cycle and host preference of Amblyomma ovale (Acari: Ixodidae) under laboratory conditions.This study evaluated for the first time the life cycle of Amblyomma ovale in the laboratory. For this purpose, larvae and nymphs were exposed to Gallus gallus (chickens), Cavia porcellus (guinea pigs), Rattus norvegicus (wistar rats), Oryctolagus cuniculus (domestic rabbits), Calomys callosus (vesper mouse), and Didelphis albiventris (white-eared opossum). Nymphs were also exposed to Nectomys squamipes (South American water rat). Adult ticks were fed on dogs. The life-cycle of A. ovale in labora ...201122113779
acquisition and transmission of hepatozoon canis (apicomplexa: hepatozoidae) by the tick amblyomma ovale (acari: ixodidae).the present study aimed to evaluate under controlled conditions the acquisition of hepatozoon canis by amblyomma ovale after feeding on infected dogs, and the subsequent induction of infection in uninfected dogs that ingested the experimentally infected ticks. two h. canis naturally infected dogs were infested with a. ovale adult ticks derived from an uninfected laboratory tick colony. after feeding, two a. ovale females presented h. canis oocysts in the hemolymph at the first and fourth days af ...200919501969
ecology of a tick-borne spotted fever in southern grande do sul is the southernmost state of brazil, bordering uruguay. clinical cases of spotted fever group (sfg) rickettsiosis were recently reported in rio grande do sul. none of these cases was lethal, and all were confirmed by seroconversion to r. rickettsii antigens. because serological cross-reactions are well known to occur between different sfg agents, the sfg agent responsible for the clinical cases remains unknown in rio grande do sul, where no rickettsial agent is known to infect ...201627392739
bacteria of the genus rickettsia in ticks (acari: ixodidae) collected from birds in costa rica.the aim of this study was to document the presence of rickettsia spp. in ticks parasitizing wild birds in costa rica. birds were trapped at seven locations in costa rica during 2004, 2009, and 2010; then visually examined for the presence of ticks. ticks were identified, and part of them was tested individually for the presence of rickettsia spp. by polymerase chain reaction (pcr) using primers targeting fragments of the rickettsial genes glta and ompa. pcr products were dna-sequenced and analyz ...201525869035
rickettsia parkeri in amblyomma dubitatum ticks in a spotted fever focus from the brazilian pampa.spotted fever is an acute febrile illness, which is considered severely underreported and misdiagnosed in the brazilian pampa, caused by tick-borne rickettsiae. here, we report an eco-epidemiological investigation of rickettsia spp. in ticks from a spotted fever focus in toropi, southern brazil. ticks were collected from capybara carcasses and processed individually to obtain genomic dna. rickettsia was investigated using pcr that amplified the rickettsial fragments of the glta, ompa and htra ge ...201728359827
infection of amblyomma ovale with rickettsia species atlantic rainforest in serra do mar, são paulo state, brazil.rickettsia rickettsii and rickettsia sp. strain atlantic rainforest, that is considered to represent a genetic variant of rickettsia parkeri, are confirmed as being capable of infecting humans in brazil. this study reports the detection and characterization, by pcr and nucleotide sequencing, of rickettsia sp. strain atlantic rain forest in amblyomma ovale parasitizing a human, in ticks infesting dogs and in free-living ticks collected from the environment where the human infestation was recorded ...201627430967
rickettsial infection in ticks from wild birds from cerrado and the pantanal region of mato grosso, midwestern brazil.the involvement of different species of ticks and wild animals, such as birds, play an important role in the epidemiology of tick-borne diseases. birds may serve as reservoirs for some tick-borne diseases, and may carry and spread hematophagous ectoparasites mechanically. this study aimed to show the diversity of ticks on birds and molecular detection of rickettsial infection in ticks from pantanal and cerrado, two similar brazilian biomes characterized by hydrological seasons. during two years, ...201526232933
rickettsia parkeri infecting free-living amblyomma triste ticks in the brazilian pantanal.the present study evaluated the infection of rickettsiae in 151 rhipicephalus sanguineus, 59 amblyomma ovale, 166 amblyomma triste, one amblyomma dissimile and four amblyomma dubitatum ticks collected in the municipality of poconé, state of mato grosso, within the pantanal biome of brazil. ticks were individually processed by the hemolymph test with gimenez staining, isolation of rickettsia in vero cell culture by the shell vial technique, and polymerase chain reaction (pcr) targeting the citrat ...201525650348
epidemiology of rickettsia sp. strain atlantic rainforest in a spotted fever-endemic area of southern brazil.the present study was performed in vila itoupava, an area of the state of santa catarina, southern brazil, in which a tick-borne spotted fever illness has been endemic since 2003. notably, both the etiological agent and the vector of these spotted fever cases remain unknown. during january 2011, humans, domestic dogs, and their ticks were sampled in households that are typically surrounded by highly preserved atlantic rainforest fragments. ticks collected from dogs were amblyomma ovale (34% prev ...201425108786
in vitro isolation from amblyomma ovale (acari: ixodidae) and ecological aspects of the atlantic rainforest rickettsia, the causative agent of a novel spotted fever rickettsiosis in brazil.recently, a novel human rickettsiosis, namely atlantic rainforest spotted fever, was described in brazil. we herein report results of a survey led around the index case in an atlantic rainforest reserve in peruibe municipality, southeastern brazil. a rickettsia parkeri-like agent (rickettsia sp. atlantic rainforest genotype) and ricketsia bellii were isolated from adult amblyomma ovale ticks collected from dogs. molecular evidence of infection with strain atlantic rainforest was obtained for 30 ...201323363571
altitudinal assessment of amblyomma aureolatum and amblyomma ovale (acari: ixodidae), vectors of spotted fever group rickettsiosis in the state of são paulo, brazil.amblyomma aureolatum (pallas) and amblyomma ovale koch are common ectoparasites of domestic dogs in são paulo state, southeastern brazil, where they are vectors of distinct spotted fever group rickettsioses, one caused by rickettsia rickettsii (transmitted by a. aureolatum), and the other caused by rickettsia sp. strain atlantic rainforest (transmitted by a. ovale). for the present study, we performed an altitudinal assessment of all 1992-2012 records of a. aureolatum and a. ovale retrieved from ...201526336213
rickettsial infections in ticks from wild birds in paraguay.ticks were collected from wild birds at 3 locations in paraguay during the south american winter in august and september 2012. in total, 480 birds belonging to 106 species were examined. overall, 31 (6.5%) birds representing 21 species were found parasitized by ticks which were identified as amblyomma calcaratum neumann (2 larvae, 20 nymphs), amblyomma longirostre (koch) (17 larvae, 3 nymphs), amblyomma parvum aragão (7 nymphs), amblyomma aureolatum (pallas) (1 nymph), amblyomma ovale koch (1 ny ...201424231270
new tick records from the state of rondônia, western amazon, brazil.from 2005 to 2012, ticks were collected from different hosts at different localities of the state of rondônia. the following 16 ixodid tick species were identified: ixodes fuscipes, amblyomma auricularium, amblyomma coelebs, amblyomma dubitatum, amblyomma geayi, amblyomma humerale, amblyomma latepunctatum, amblyomma longirostre, amblyomma naponense, amblyomma nodosum, amblyomma oblongoguttatum, amblyomma ovale, amblyomma romitii, amblyomma rotundatum, amblyomma scalpturatum, and amblyomma varium ...201423975565
ticks infesting humans in northern misiones, argentina.this work presents records of ticks infesting humans in northern misiones province, argentina. also, notes on potential transmission of tick-borne pathogens are included. a total of 282 ticks attached to researchers were collected and identified by their morphological characters. eight tick species were found: amblyomma brasiliense, amblyomma coelebs, amblyomma dubitatum, amblyomma incisum, amblyomma ovale, haemaphysalis juxtakochi, rhipicephalus sanguineus and rhipicephalus microplus. some of t ...201627135846
ticks (acari: ixodidae) identified from prey-predator interactions via faecal analysis of brazilian wild carnivores.between july 2008 and may 2010, we conducted a trophic study on 12 brazilian wild carnivore species through their faecal analysis in a silvicultural landscape at angatuba municipality, southern são paulo state. predator faeces was identified by morphology, predator hair, and surrounding tracks; prey remnants within faeces were used for morphological identification of the prey. among the recovered ectoparasites, there were 89 specimens of six tick species in 21 (4.0%) out of 523 analysed samples. ...201525702204
rickettsial infection in ticks (acari: ixodidae) of wild animals in midwestern brazil.ticks collected in the last two decades from free-living and captive wild animals from 28 municipalities of the brazilian state of mato grosso were identified and tested using molecular methods for the presence of rickettsial agents. a total of 4467 ticks (229 larvae, 1676 nymphs, 1565 males, 997 females) representing 27 ixodid species were collected from 235 species of amphibians, reptiles, birds, and mammals from three different ecoregions (pantanal, cerrado, and amazonia). the species amblyom ...201626775021
environmentally associated ticks (acari: ixodidae) in campo grande, mato grosso do sul, brazil.herein, we report tick species found on wild and domestic animals and in the environment during a one-year sampling period at the brazilian farming research company beef cattle unit (embrapa beef cattle), which is located within the urban area of campo grande, mato grosso do sul, brazil. from 55 wild hosts including six different species (nasua nasua, cebus spp., cerdocyon thous, myrmecophaga tridactyla, tamandua tetradactyla and dasyprocta aguti), 323 ticks were collected. amblyomma ovale ticks ...201324252958
a survey of ectoparasites infesting urban and rural dogs of maranhão state, brazil.this study evaluated for the first time, ectoparasite infestations on dogs from urban and rural areas of the continental land of the state of maranhão, northeastern brazil. in total, 622 dogs were examined for ectoparasite infestations. overall, 392 (63.0%) were infested with ectoparasites, 154 (51.3%) of 300 urban dogs and 238 (73.9%) of 322 rural dogs. five species of ectoparasites were found, three ticks [rhipicephalus sanguineus (latreille), amblyomma ovale koch, and amblyomma cajennense (f. ...201323802466
ticks (acari: ixodidae) associated with small terrestrial mammals in the state of minas gerais, southeastern brazil.from june 2005 to november 2010, 43 small mammals encompassing 6 species of didelphimorphia, 8 species of rodentia, and 1 species of lagomorpha were found parasitized by ticks in the state of minas gerais, southeastern brazil. nine tick species, in total 186 specimens, were identified as follows: amblyomma cajennense (larvae and nymphs) on opossums and rodents; amblyomma ovale (nymphs) on rodents; amblyomma parvum (nymphs) on rodents; amblyomma coelebs (nymphs) on opossums; amblyomma dubitatum ( ...201222585005
association patterns of ticks (acari: ixodida: ixodidae, argasidae) of small mammals in cerrado fragments, western brazil.the present study describes ticks associated with small mammals and analyzes the aggregation patterns according to seasonal and host variations in the cerrado biome, central-western brazil. small mammals were systematically captured in 54 woodland fragments from february 2012 to july 2013. a total of 1,040 animals belonging to eight marsupial and 12 rodent species were captured; 265 animals were parasitized by eight tick species (in decreasing order of abundance): ornithodoros mimon, amblyomma c ...201525633262
ticks (acari: ixodidae) on wild birds in north-central argentina.ixodid ticks were collected from wild birds in five ecoregions in north-central argentina, namely: selva de las yungas, esteros del iberá, delta e islas del paraná, selva paranaense and chaco seco. a total of 2199 birds belonging to 139 species, 106 genera, 31 families and 11 orders were captured, but ticks were collected only from 121 birds (prevalence=5.5%) belonging to 39 species (28.1%) and three orders: tinamiformes (tinamidae) and falconiformes (falconidae) in selva de las yungas and passe ...201425108788
bird ticks in an area of the cerrado of minas gerais state, southeast the present study the tick prevalence, mean intensity of infestation and species were recorded on birds captured between january 2009 and december 2010 in the ecological station pirapitinga-esec from minas gerais state, brazil. a total of 967 birds, from 15 families and 40 species were captured and 165 (17.1 %) individuals were parasitized by ticks. of these 160 (97 %) belonged to the order passeriformes. five tick species were identified: amblyomma longirostre (n = 274) was the most common s ...201222729500
genetic identification of rickettsia sp. strain atlantic rainforest in an endemic area of a mild spotted fever in rio grande do sul state, southern brazil.rickettsia sp. strain atlantic rainforest causes a less severe rickettsiosis, with two cases confirmed until now. the tick species amblyomma ovale is appointed as the main vector of this bacterium. the southern region of brazil has reported patients with spotted fever who have milder symptoms. in 2013, during an investigation of rickettsiosis cases, an a. ovale tick was found attached to a man in an area where there were two cases. the parasite was processed for molecular analysis and the ricket ...201627338183
isolation of the pathogen rickettsia sp. strain atlantic rainforest from its presumed tick vector, amblyomma ovale (acari: ixodidae), from two areas of this study, amblyomma ovale koch ticks were collected from domestic dogs in two localities of the atlantic rainforest biome of brazil: 1) the paty valley of the chapada diamantina national park, bahia state (northeastern brazil), and 2) adrianópolis, paraná state (southern brazil). ticks were screened for the presence of rickettsia-like structures by the hemolymph test with giménez staining, and then processed for isolation of rickettsiae in vero cell culture by the shell-vial technique. rick ...201627146681
comparative evaluation of amblyomma ovale ticks infected and noninfected by rickettsia sp. strain atlantic rainforest, the agent of an emerging rickettsiosis in 2010, a novel spotted fever group rickettsiosis was reported in the atlantic rainforest coast of brazil. the etiological agent was identified as rickettsia sp. strain atlantic rainforest, and the tick amblyomma ovale was incriminated as the presumed vector. the present study evaluated under laboratory conditions four colonies of a. ovale: two started from engorged females that were naturally infected by rickettsia sp. strain atlantic rainforest (designated as infected groups); the two others ...201626895674
rickettsial infection in domestic mammals and their ectoparasites in el valle de antón, coclé, panamá.the present research evaluated the presence of rickettsia spp. on ectoparasites of horses and dogs (using pcr techniques), and their sera (using immunofluorescence assay) in el valle de antón town in panama. a total of 20 horses and 20 dogs were sampled, finding four species of ectoparasites on dogs (the ticks rhipicephalus sanguineus, amblyomma ovale, amblyomma oblongoguttatum, and the flea ctenocephalides felis), and two tick species on horses (amblyomma cajennense and dermacentor nitens). dna ...201021144663
perspectives on canine and feline hepatozoonosis.two species of hepatozoon are currently known to infect dogs and cause distinct diseases. hepatozoon canis prevalent in africa, asia, southern europe, south america and recently shown to be present also in the usa causes infection mainly of hemolymphoid organs, whereas hepatozoon americanum prevalent in the southeastern usa causes myositis and severe lameness. h. americanum is transmitted by ingestion of the gulf coast tick amblyomma maculatum and also by predation on infected prey. h. canis is ...201121620568
seroprevalence of tick-borne pathogens and tick infestation in dogs from tapirapé and karajá indigenous communities, brazil.with the aim of studying some tick-borne diseases, a total of 327 dogs (114 from tapirapé and 213 from karajá indigenous ethnicity, mato grosso, mt, brazil) were sampled. serum samples were submitted to the indirect fluorescence antibody test (ifat) to detect antibodies against babesia vogeli, ehrlichia canis, and rickettsia spp. possible associations of risk factors and the occurrence of seroreativity to tick-borne agents and tick infestations were analyzed through chi-squared tests. among 327 ...201526186512
nellore cattle (bos indicus) and ticks within the brazilian pantanal: ecological relationships.pantanal is a huge floodplain mostly in brazil, and its main economic activity is extensive cattle raising, in farms characterized by an extremely wildlife-rich environment. we herein describe tick infestations of cattle and of the natural environment in pantanal of nhecolândia in brazil, at areas with and without cattle during both dry and wet seasons. environmental sampling resulted in three tick species: amblyomma sculptum (423 nymphs and 518 adults), amblyomma parvum (7 nymphs and 129 adults ...201626613758
complementary data on four methods for sampling free-living ticks in the brazilian this study, four methods for sampling free-living ticks that are used in ecological and human tick-bite risk studies were evaluated. cloth dragging, carbon dioxide traps and visual searches and inspection of plant litter on the ground were used in field and forest areas within the brazilian pantanal. among the three tick species collected, amblyomma sculptum predominated, followed by amblyomma parvum and amblyomma ovale. dragging, a cheap and simple technique, yielded the highest numbers of t ...201725517531
infection of amblyomma ovale by rickettsia sp. strain atlantic rainforest, colombia.our goal was to understand rickettsial spotted fevers' circulation in areas of previous outbreaks reported from 2006 to 2008 in colombia. we herein present molecular identification and isolation of rickettsia sp. atlantic rainforest strain from amblyomma ovale ticks, a strain shown to be pathogenic to humans. infected ticks were found on dogs and a rodent in antioquia and córdoba provinces. this is the first report of this rickettsia outside brazil, which expands its known range considerably.201425090976
first occurrence of amblyomma ovale in the state of rio grande do norte, brazil.this study aims to report the occurrence of parasitism by amblyomma ovale (koch, 1844) in dogs in the municipality of apodi, rio grande do norte, brazil. specimens were identified as being one female and two males of a. ovale, besides; the animal was infested by five females of rhipicephalus (boophilus) microplus and seven females and three males of r. sanguineus. the finding of a. ovale confirms results in the literature that these ticks, reported in several species of wild carnivores, can also ...201324252966
current status of amblyomma ovale (acari: ixodidae) in panama.the genus amblyomma is the most diverse and relevant among the neotropical ticks. in panama, this genus contains 19 species, including amblyomma ovale. there is a lack of knowledge of the ecology of a. ovale in panama, and thus the aim of this work is to report on its geographical distribution and its spectrum of vertebrate hosts. we reviewed data of ticks collected in different areas of panama from 2007 to 2012 and found parasitism of a. ovale in 625 vertebrates, corresponding to 21 species (2 ...201323128020
a surrogate life cycle of amblyomma ovale koch, ticks spend most of their time off-host, the environment is a major selective force of these parasites. in fact, human impact on landscapes has favored a minority of tick species which became well-known pests. however, this is an ongoing process and novel pests may arise. we herein report a surrogate life cycle of a neotropical tick species, amblyomma ovale, and which may be related to an increased risk of human rickettsiosis. under natural conditions, adults of this tick species feed on carn ...201222910060
ectoparasites of dogs in home environments on the caribbean slope of costa rica.reports on ectoparasites on dogs in central america are scarce. the aim of this study was to identify flea, louse and tick species infesting dogs in home environments on the caribbean slope of costa rica, and determine their frequency and coexistence. ectoparasites were collected from dogs in 83 rural homes at five study sites. specimens were identified and separated according to species. fleas were the most common ectoparasite (g = 22,217, df = 8, p = 0.004). ctenocephalides felis and pulex sim ...201322832763
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 ...201728594882
wild and domestic animals likely involved in rickettsial endemic zones of northwestern colombia.between 2006 and 2008, three outbreaks of human rickettsiosis occurred in northwestern colombia (municipalities of necoclí, los córdobas and turbo), with case fatality rates between 27% and 54%. the aim of this study was to determine previous exposure of wild and domestic animals to spotted fever group (sfg) rickettsiae through serological tests, to detect rickettsial evidence in their ectoparasites, and to analyze their possible role in the epidemiology of rickettsial diseases in this zone of t ...201728774495
rickettsia rickettsii infecting rhipicephalus sanguineus sensu lato (latreille 1806), in high altitude atlantic forest fragments, ceara state, brazil, spotted fever (sf) is caused by rickettsia rickettsii and rickettsia parkeri strain atlantic forest. in recent years, several human cases of a milder sf have been reported from the maciço de baturité region of ceará state. previous studies in this region found r. parkeri strain atlantic forest to be present in rhipicephalus sanguineus sensu lato and amblyomma ovale ticks. the present study isolated and identified the rickettsia spp. present in this new endemic area in brazil. in march ...201728535905
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 ...201829111373
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) ...201728981693
experimental infection in cavia porcellus by infected amblyomma ovale nymphs with rickettsia sp. (atlantic rainforest strain).this study describes experimental infection of guinea pigs (cavia porcellus) infested with naturally infected amblyomma ovale nymphs with rickettsia sp. (atlantic rainforest strain), and the capacity of a. ovale nymphs to transmit this bacterium. twenty-six guinea pigs were divided into the following groups: g1, 10 animals infested with uninfected a. ovale nymphs; g2, 10 animals infested with nymphs infected with rickettsia sp. (atlantic rainforest strain); and g3, 6 animals without tick infesta ...201829374783
ixodidae fauna of domestic dogs in parana, southern brazil.the present study aimed to contribute towards identification and registration of tick species that parasitize dogs in rural and urban areas of three mesoregions of paraná, southern brazil, and to estimate the rate of occurrence of each species. fifty-six dogs with ticks living in three mesoregions: metropolitana de curitiba (mc), centro oriental (cop) and centro sul paranaense (csp), were used in the study. from these 56 dogs, 253 ticks were collected and were identified and morphologically char ...201728678895
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 ...201829055642
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