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Detection of antibody to pseudorabies virus in swine sera by indirect immunoperoxidase plaque staining

A new method for the detection of pseudorabies antibody in swine sera was developed by use of the indirect immunoperoxidase plaque staining test. The indirect immunoperoxidase plaque staining test demonstrated serologic responses in pigs that were subcutaneously infected with pseudorabies virus. The test had a sensitivity and a specificity comparable to those of the complement-dependent neutralization test and appeared to be somewhat more sensitive than the neutralization test and the enzyme-linked immunosorbent assay. The test was simple to perform, and the results could be read with the unaided eye under ordinary light, making the test particularly suitable for the routine testing of large numbers of serum samples.