serological screening for infectous cattle diseases: iii. choice of sentinel animals
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ID: 253082
1993
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Abstract
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.
| Reference Key |
rojas1993cinciaserological
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|---|---|
| Authors | ;José Alfonso Barajas- Rojas;Hans Riemann;Charles Franti |
| Journal | Trials |
| Year | 1993 |
| DOI |
10.1590/S0103-84781993000200015
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