Abstract
Blood samples were collected from thirty seven adult parasited capybaras and twenty one free of parasitism aiming the characterization of different circulating cell types and complete hemogram. After a morphological analysis, the blood cells were identified as heterophils, eosinophils, basophils, lymphocytes, monocytes and platelets. The PAS reaction revealed glycogen in heterophils and platelets cytoplasm. A positive reaction was found only in heterophils round granules and in all cytoplasmic granules of eosinophils for the demonstration of myeloperoxidase activity and lipids. The bromofenol blue method revealed strong positivity in heterophils, eosinophils, basophils granules and red blood cells. A positive reaction for alkaline phosphatase was observed in eosinophils and heterophils. The blood parameters studied showed statistic differences (p 6 /µL and 2,81±0,62 x 10 6 /µL) , haematocrit (48.14±4.75% and 41,22±6.21%) and heterophils (39,38±11,02% and 16,14±7,13%) /eosinophils (8,57±3,78% and 21,92±10,24%) in differential count. In this case the ticks involved in the parasitism of these capybaras were identified as Amblyomma cajenense and Amblyomma cooperi . These data showed that the highly infested capybaras presented some anemia and a remarkable eosinophilia.
Highlights
Os carrapatos ixodídeos são ectoparasitas obrigatórios de uma ampla variedade de vertebrados
Blood samples were collected from thirty seven adult parasited capybaras and twenty one free of parasitism aiming the characterization of different circulating cell types and complete hemogram
The blood cells were identified as heterophils, eosinophils, basophils, lymphocytes, monocytes and platelets
Summary
Capivaras em cativeiro do Estado de São Paulo e do Rio Grande do Sul foram classificadas em dois grupos: parasitadas por carrapatos e não-parasitadas (animais controle). Parasitadas e controle, eram animais adultos pesando em média 45kg. Colheram-se, de todos os animais, carrapatos para identificação e sangue para a análise morfológica, citoquímica e realização do hemograma. Foram obtidas amostras de vinte e uma capivaras sem infestação aparente (animais controle) e de trinta e sete capivaras parasitadas por carrapatos. A procedência e o sistema de criação estão demonstrados na Tabela 1
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