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Experimental bovine schistosomiasis in zebu calves Esquistossomose bovina experimental em bezerros zebuínos

Five calves were each experimentally infected with 30,000 cercariae of Schistosoma bovis and three calves were kept as controls. S. bovis eggs first appeared in feces of the infected animals by week 5 post infection and all animals were shedding by week 6 post infection. Between week 7 and 9 post in...

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Bibliographic Details
Published in:Ciência rural 1995-01, Vol.25 (1), p.99-103
Main Authors: Imadeldin Elamin Aradaib, Babiker Abbas, Hans Peter Riemann, Bennie Irve Osburn
Format: Article
Language:English
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Summary:Five calves were each experimentally infected with 30,000 cercariae of Schistosoma bovis and three calves were kept as controls. S. bovis eggs first appeared in feces of the infected animals by week 5 post infection and all animals were shedding by week 6 post infection. Between week 7 and 9 post infection, where fecal egg counts were highest, the infected animals developed mucoid and then hemorrhagic diarrhoea and they became dull and depressed. Packed cell volumes and hemoglobin concentrations of the infected animals showed progressive reductions compared to the uninfected control calves. The animals were necropsied and perfused at week 12 post infection and tissue egg densities and worm burden were determined.Cinco bezerros foram infectados experimentalmente com 30.000 cercarias de Schistosoma bovis e três bezerros foram usados como controle. Ovos de S. bovis apareceram inicialmente nas fezes dos animais infectados pela 5ª semana após infecção e todos os animais estavam eliminando ovos na 6ª semana após infecção. Entre as 7ª e 9ª semanas após infecção, nas quais a quantidade fecal de ovos era mais alta, os animais infectados manifestaram diarréia com muco seguida por disenteria e os animais apresentando-se morimbundos e depressivos. PCV e concentração da hemoglobina dos animais infectados demonstrou redução progressiva em comparação com os bezerros não infectados. Os animais foram necropsiados na 12ª semana para determinação da densidade de ovos nos tecidos e quantidade de parasitas.
ISSN:0103-8478
1678-4596
DOI:10.1590/S0103-84781995000100019