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vol.23 número2TRIAGEM SOROLÓGICA DE DOENÇAS INFECCIOSAS: II. ASSOCIAÇÃO ENTRE PREVALÊNCIA E NÍVEIS DE POSITIVIDADE AO ELISAINTOXICAÇÃO CRÔNICA POR Pteridium aquilinum (L) Kuhn (Polypodiaceae) EM BOVINOS índice de autoresíndice de assuntospesquisa de artigos
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Ciência Rural

versão impressa ISSN 0103-8478

Resumo

ROJAS, José Alfonso Barajas-; RIEMANN, Hans  e  FRANTI, Charles. SEROLOGICAL SCREENING FOR INFECTOUS CATTLE DISEASES: III. CHOICE OF SENTINEL ANIMALS. Cienc. Rural [online]. 1993, vol.23, n.2, pp.197-201. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84781993000200015.

A herd of Cattle (Holstein-Zebu crosses) was screened bimonthly for two years by ELISA for IgG antibodies to infectious disease agents. The herd was composed of 3 age groups: Young animals ( < 4 months of age), developing animals (4-36 months of age) and producing animals ( > 36 months of age). Ali young animals received colostrum within two hours after birth. The overall consistency of ELISA results, i. e agreement between two consecutive tests was about the same for the three age groups and was lowest for infections of intermediate prevalence (40-50%). The interpretation of changes in seroprevalence is most straight forward for young animals. Young animals positive at their first test reflect the immune status of their mothers while young animals born seronegative but seroconverting reflect the incidence rate. It is concluded that young animals when tested repeatedly are the best sentinel animals.

Palavras-chave : ELISA; seroconversion; young; sentinels; infectious diseases.

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