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Epidemiological aspects of bovine parasitic otitis caused by Rhabditis spp. and/or Raillietia spp. in the state of Minas Gerais, Brazil.
Duarte, E R; Melo, M M; Hamdan, J S.
Afiliação
  • Duarte ER; Department of Microbiology, Federal University of Minas, Biological Science Institute, ICB/UFMG, Av. Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil.
Vet Parasitol ; 101(1): 45-52, 2001 Oct 31.
Article em En | MEDLINE | ID: mdl-11587832
ABSTRACT
The occurrence of bovine external otitis in tropical regions is predominantly assigned to parasitic infections by rhabditiform nematodes and infestations by mites of the genus Raillietia. This research had the purpose of investigating the prevalence of parasitic otitis in the dry and rainy seasons of Minas Gerais and correlating it with variables age, breed and the presence of horns. The secretion or cerumen of 981 cattle was collected with sterile swabs, placed in test tubes and exposed to sunlight for the identification of clinical infections caused by rhabditiform nematodes. The ear canals of 109 animals were flushed to study the occurrence of mites of the genus Raillietia. Clinical otitis caused by rhabditiform nematodes was observed only in animals of the Gyr breed, affecting 169 (60.1%) of the total (278) of these cattle. The prevalence of otitis in this breed was significantly higher for mature adult cows (P<0.001) and in cows with horns (P<0.001). In a total of nine animals suspected of raillietiosis, the examinations revealed the presence of Raillietia spp. in two Dutch cows. These results demonstrate that treatment must be focused on adult Gyr cattle with horns. This and future studies with an emphasis on epidemiological aspects may contribute to development of alternative approaches to reduce disease.
Assuntos
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Base de dados: MEDLINE Assunto principal: Otite Externa / Doenças dos Bovinos Tipo de estudo: Prevalence_studies / Prognostic_studies / Risk_factors_studies Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Vet Parasitol Ano de publicação: 2001 Tipo de documento: Article País de afiliação: Brasil
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Base de dados: MEDLINE Assunto principal: Otite Externa / Doenças dos Bovinos Tipo de estudo: Prevalence_studies / Prognostic_studies / Risk_factors_studies Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Vet Parasitol Ano de publicação: 2001 Tipo de documento: Article País de afiliação: Brasil