| brazilian distribution of amblyomma varium koch, 1844 (acari: ixodidae), a common parasite of sloths (mammalia: xenarthra). | amblyomma varium, commonly known in brazil as the "carrapato-gigante-da-pregui a" (sloth's giant tick) is found from southern central america to argentina. the present study adds information on the geographical distribution of a. varium, as well as on their hosts, based on material deposited in the main brazilian collections and on the available literature. eighty-two vials, containing 191 adult specimens, deposited in five acari collections between 1930 and 2001, were examined. these vials incl ... | 2003 | 12563481 |
| redescription of amblyomma varium koch, 1844 (acari: ixodidae) based on light and scanning electron microscopy. | amblyomma varium koch, 1844 is a neotropical tick, known as the 'sloth's giant tick', with records from southern central america to argentina. it is found almost exclusively on mammals of the families bradypodidae and magalonychidae (xenarthra). differences exist in discussions with regard to the dentition of the female hypostome being either 3/3 or 4/4. the male was also originally described as having a short spur on coxa iv, but some specimens recently collected from different brazilian locali ... | 2008 | 18038200 |
| gastrointestinal parasites and ectoparasites of bradypus variegatus and choloepus hoffmanni sloths in captivity from costa rica. | sloths may serve as host to a wide range of parasites. however, there is little information available on the types of parasites that affect costa rica's sloth population. during a 1-yr period, 65 specimens of costa rican sloth species (choloepus hoffmanni; n = 56) and bradypus variegates; n = 9) from a local zoo were sampled. fecal samples were evaluated using two different diagnostic techniques, sheather's flotation and sedimentation. concurrently, these sloths were examined for ectoparasites. ... | 2009 | 19368244 |
| ticks on captive and free-living wild animals in northeastern brazil. | from 2005 to 2009, 147 ticks found on 32 wild animals from or referred to two zoobotanical parks (parque zoobotânico arruda câmara and parque estadual dois irmãos) located in northeastern brazil were identified. ticks found on two veterinarians working in one of the parks (i.e., parque estadual dois irmãos), after return from forested areas within the park's territory, were also identified. the following tick-host associations were recorded: amblyomma fuscum neumann on boa constrictor l.; amblyo ... | 2010 | 19693679 |
| rickettsial infection in ticks collected from road-killed wild animals in rio de janeiro, brazil. | during 2008-2010, ticks were collected from road-killed wild animals within the serra dos orgãos national park area in the state of rio de janeiro, brazil. in total, 193 tick specimens were collected, including amblyomma dubitatum neumann and amblyomma cajennense (f.) from four hydrochoerus hydrochaeris (l.), amblyomma calcaratum neumann and a. cajennense from four tamandua tetradactyla (l.), amblyomma aureolatum (pallas) and a. cajennense from five cerdocyon thous l., amblyomma longirostre (koc ... | 2012 | 23270184 |
| 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. | 2015 | 25616567 |
| 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 ... | 2016 | 27812506 |
| host specificity in a diverse neotropical tick community: an assessment using quantitative network analysis and host phylogeny. | 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 ... | 2016 | 27357506 |
| rickettsia bellii, rickettsia amblyommii, and laguna negra hantavirus in an indian reserve in the brazilian amazon. | the purpose of this study was to identify the presence of rickettsia and hantavirus in wild rodents and arthropods in response to an outbreak of acute unidentified febrile illness among indians in the halataikwa indian reserve, northwest of the mato grosso state, in the brazilian amazon. where previously surveillance data showed serologic evidence of rickettsia and hantavirus human infection. | 2014 | 24742108 |
| 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 ... | 2016 | 27592065 |
| 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 ... | 2015 | 25869035 |
| rickettsial agents in avian ixodid ticks in northeast brazil. | birds are important in the maintenance and spread of ticks and tick-borne diseases. in this context we screened birds in the atlantic forest north of the são francisco river and caatinga in northeast brazil. in the atlantic forest amblyomma longirostre, amblyomma nodosum, amblyomma varium and amblyomma auricularium were identified. a. longirostre was infected by "candidatus rickettsia amblyommii" and a. nodosum by a rickettsia parkeri-like agent. in caatinga, amblyomma parvum and a. auricularium ... | 2015 | 25800099 |
| rickettsia bellii in ticks amblyomma varium koch, 1844, from birds in peru. | amazonian birds were caught and examined for the presence of ectoparasites in the allpahuayo mishana national reserve near iquitos, peru, from 13 to 16 august 2011. a total of 40 birds representing 16 species were examined. two birds (5%) were infested with 2 larvae of amblyomma varium koch, 1844, and one nymph of a. calcaratum neumann, 1899. the 2 larvae of a. varium were infected with rickettsia bellii. this is the first report of r. bellii in a. varium and also the first record of this ricket ... | 2012 | 22809734 |
| 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 ... | 2014 | 23975565 |
| 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 ... | 2016 | 26775021 |
| oocyte maturation in the sloth's giant tick amblyomma varium (acari: ixodidae) in an ecological context. | the sloth's giant tick amblyomma varium koch, which is a neotropical species that inhabits tropical rainforests, is the largest tick reported to date. the adult stage of this tick parasitizes mammals from the families bradypodidae and magalonychidae (xenarthra) nearly exclusively. this study aimed to describe morphological and histological features of the reproductive system and the oocyte maturation process of this tick species. the ovary of a. varium is a long single tubular organ that is hors ... | 2014 | 25037744 |
| contributions to the knowledge of hard ticks (acari: ixodidae) in colombia. | the known tick fauna of colombia includes 58 species (15 argasidae and 43 ixodidae). to add to the knowledge of the biology of ticks in colombia, hard ticks (ixodidae) were collected from domestic animals or vegetation during 2014-2016 in 10 of colombia's departments. ticks were identified to species through morphological examinations. taxonomic identification was confirmed for some specimens by molecular methods, including phylogenetic analyses inferred from three tick genes (cytochrome c oxida ... | 2018 | 29055642 |