A comparison was made of the serum neutralisation, immunofluorescent antibody and immunoperoxidase tests for the detection of antibodies to chicken anaemia agent. Serum samples from groups of chicks with and without maternally derived antibody to the agent were tested and the response of chicks after inoculation with the agent was also measured. The serum neutralisation test was reliable and sensitive, but expensive and could take up to three weeks to obtain a result. The immunofluorescent antibody test was cheaper and required only one day to obtain a result, but it was not as sensitive in detecting low levels of antibody to the chicken anaemia agent. The immunoperoxidase test was also cheaper but took two days to obtain a result and required one more manipulation than the immunofluorescence test. It was comparable to the serum neutralisation test in its ability to detect low levels of antibody.
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