Preparation of Complement Fixation Antigen ofChlamydia psittaciGrown in Tissue Culture by Treatment with β-Propiolactone

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Abstract
A new method of preparing a chlamydial complement fixation (CF) antigen by treatment with β‐propiolactone (BPL) is presented. Chlamydia psittaci strains Pigeon‐1041 and Budgerigar‐No. 1, and Chlamydia trachomatis strain L2/434/BU, propagated in L‐929 cell monolayers, were inactivated with BPL. This BPL‐treated antigen was useful for detecting CF antibodies in both human and pigeon sera, and it did not cause false‐positive reactions, as are sometimes observed between some human sera and phenol‐treated antigen derived from eggs. When this CF antigen was treated with potassium periodate and tested for reactivity with mouse immune ascitic fluid, it was found that the antigen contained type‐ or strain specificity as well as genus specificity. Immunization with the BPL‐treated antigen elicited type‐ or strain‐specific neutralizing antibody.