Abstract

ABSTRACT With the purpose of verify the presence of larvae from the genus Gasterophilus in the Rio Grandedo Sul State, a study was undertaken using 395 horses taken to slaughter in the city of Pelotas. Thematerial analysis revealed that 126 animals (31,90%) presented infection, with 100 animals (25,32%)infected by Gasterophilus nasalis , and 47 animals (11,90%) infected by G . intestinalis . These resultsalso represent the first report of the definite establishment of G. intestinalis as a horse parasite inBrazil. The probable implications of G. intestinalis occurrence in Brazil are discussed. Key words: Gasterophilus; G. nasalis; G. intestinalis. * Laboratorio de Doencas Parasitarias da Faculdade de Veterinaria, UFPel, Pelotas, Brasil.** Setor de Parasitologia, Departamento de Microbiologia, Instituto de Ciencias Basicas da Saude, UFRGS, PortoAlegre, Brasil. INTRODUCTIONThe genus Gasterophilus (Diptera, Oestridae)includes eight species of flies whose larvae causegastrointestinal myiasis in equids

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