Abstract
An enzyme-linked immunosorbent assay was developed to detect antibodies to infectious bovine rhinotracheitis virus in bovine sera. The test used viral antigen purified in a sucrose density gradient, and the antibody titers detected were up to 100 times higher than those seen in the serum neutralization test. When 250 sera were tested by those two tests, 146 were positive and 49 were negative in both tests. Only 1 serum was negative in the immunoassay test and positive in the neutralization test. However, 54 sera negative in the neutralization test were positive in the immunoassay test. These positive results appear to be in agreement with the increased sensitivity of the enzyme immunoassay.
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