| gynandromorphism in amblyomma cajennense and rhipicephalus sanguineus (acari: ixodidae). | during a survey of ticks on horses in november 2000, at the university of são paulo farm in pirassununga county, são paulo, brazil, 1 gynandromorph of amblyomma cajennense was collected from a naturally infested horse. in another survey on dogs in march 2001, in the urban area of monte negro, rondônia, brazil, a gynandromorph of rhipicephalus sanguineus was collected from a naturally infested dog. both specimens are described and classified as perfect bipartite protogynanders. | 2002 | 12197141 |
| notes on parasitism by amblyomma humerale (acari: ixodidae) in the state of rondônia, western amazon, brazil. | the tick amblyomma humerale koch is endemic to south america. all host records refer to the adult stage parasitizing tortoises, mostly yellow-footed tortoise, geochelone denticulata (l.), and red-footed tortoise, geochelone carbonaria (spix). the current study reports the presence of a. humerale in the state of rondônia, brazil. a total of 215 adult ticks (201 males, 14 females) was collected from six g denticulata in an indian reserve and nine geochelone sp. in rural monte negro county, giving ... | 2002 | 12495177 |
| molecular evidence for a spotted fever group rickettsia species in the tick amblyomma longirostre in brazil. | two amblyomma longirostre adult male ticks were collected from a brazilian porcupine coendou prehensilis l. in the state of rondonia, western amazon, brazil. the two ticks were pooled for dna extraction and tested for the presence of rickettsial dna by amplifying portions of the glta, 17-kda, ompa, and ompb rickettsial genes by polymerase chain reaction (pcr). portions of the four genes were amplified from the sample and subsequently sequenced. these results indicated the presence of a rickettsi ... | 2004 | 15185961 |
| 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 ... | 2004 | 15605647 |
| a preliminary investigation of ehrlichia species in ticks, humans, dogs, and capybaras from brazil. | a molecular epidemiologic investigation in two brazilian states (rondônia and são paulo) was undertaken to determine if ehrlichia species responsible for human and animal ehrlichioses in north america could be found in brazilian vectors, potential natural mammalian reservoirs and febrile human patients with a tick bite history. samples, including 376 ticks comprising 9 amblyomma species, 29 capybara (hydrochaeris hydrochaeris) spleens, 5 canine blood, and 75 human blood samples from febrile pati ... | 2007 | 16962245 |
| ticks (acari: ixodidae) infesting wild birds in an atlantic forest area in the state of são paulo, brazil, with isolation of rickettsia from the tick amblyomma longirostre. | during field work in nazaré paulista, state of são paulo, brazil, we found 13 (56.5%) of 23 birds (mostly passeriformes) to be infested by 28 larvae and 1 nymph of amblyomma spp. two larvae were reared to the adult stage, being taxonomically identified as amblyomma parkeri fonseca and aragio, whereas five larvae and one nymph were identified as amblyomma longirostre koch. all six a. longirostre specimens were shown to be infected by rickettsia, as demonstrated by polymerase chain reaction (pcr) ... | 2008 | 18714882 |
| first record of amblyomma scalpturatum neumann (acari: ixodidae) in the states of paraná and roraima, brazil. | amblyomma scalpturatum neumann has been reported in brazil in the northern (states of amazonas, pará and rondônia) and mid-western regions (states of mato grosso and mato grosso do sul). it has been found in association with large and medium sized mammals, as artiodactyla, perissodactyla, xenarthra and carnivora. in this paper, this tick species is reported for the first time in the brazilian states of paraná and roraima, southern and northern regions, respectively. | 2010 | 20676523 |
| new tick records in rondônia, western brazilian amazon. | in the present study, we provide new tick records from vilhena municipality, in the southeast of the state of rondônia, northern brazil. ticks collected from a capybara, hydrochoerus hydrochaeris (linnaeus), were identified as amblyomma romitii tonelli-rondelli (1 female), and amblyomma sp. (1 larva). ticks collected from a harpy eagle, harpia harpyja (linnaeus), were identified as amblyomma cajennense (fabricius) (16 nymphs) and haemaphysalis juxtakochi cooley (1 nymph). ticks collected from a ... | 2010 | 20943027 |
| cross-mating experiments with geographically different populations of amblyomma cajennense (acari: ixodidae). | the present study evaluated the reproductive compatibility of the crosses between adult ticks of the following three geographically different populations of amblyomma cajennense: state of são paulo (sp), southeastern brazil; state of rondônia (ro), northern brazil; and colombia (co). in addition, crosses between a. cajennense ticks from argentina (ar) and sp ticks were also performed. the argentinean population (ar) was compatible with sp because their crosses resulted in high % egg hatching (me ... | 2011 | 21286933 |