Immunotyping of Chlamydia psittaci by Indirect Immunofluorescence Antibody Test with Monoclonal Antibodies

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Abstract
Monoclonal antibodies against pigeon and budgerigar strains of Chlamydia psittaci were used to classify the immunotypes of C. psittaci strains by an indirect immunofluorescence antibody (IFA) test. Thirty‐three C. psittaci strains from pigeons and 24 from budgerigars were divided into three immunotypes (P‐I, P‐II, and P‐III) and (B‐I, B‐II, and B‐III), respectively. Two strains from human psittacosis patients were identified as P‐III and B‐I, coinciding with the epidemiological evidence of each human infection. Two strains from psittacine birds, a parrot and a parakeet, were identical to the B‐II immunotype. Other mammalian strains were quite distinct from avian strains in their IFA reaction with the monoclonal antibodies.

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