Comparison of the hemagglutination-inhibition test with the constant-virus diluting-serum microneutralization test for detecting antibody to avian infectious bronchitis virus.

An evaluation was made of the hemagglutination-inhibition test and the constant-virus diluting-serum microneutralization test, two serological techniques that are used in detecting antibodies to avian infectious bronchitis. The repeatabilities and sensitivities of both tests were similar. Both tests compared favorably when testing high-titered antisera, but antibody titers detected varied when low-titered sera were used.