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To develop EIA kit with low cross-reactivity for the quantitative detection of anti-chlamydial antibodies, we examined the preparation of trachomatis antigens and its specificity to mouse antisera and human sera. The chlamydial elementary body (EB) purified from C. trachomatis L2/434/Bu strain was treated by Sarkosyl, dithiothreitol and SDS by turns to obtain the soluble EB outer membrane (COMC). SDS-PAGE showed that the major components of the COMC were 96K, 60K and 39.5 KDa peptides. The reactivity of the COMC immobilized to 96 wells microtiter plate to mouse anti-serum to C. trachomatis was higher than the other two mouse anti-sera to C. psittaci and pneumoniae. In human sera, the cut off values were calculated from an average optical density plus its two-fold standard deviation obtained by the testing of 100 samples of healthy human sera. We evaluated the specificity of the kit to 17 anti-C. pneumoniae, 9 C. trachomatis and 4 C. psittaci antibodies positive patients' sera judged by the MFA method respectively. The results showed that the concordance ratio of IgG and IgA were 88%, 100% in anti-C. pneumoniae, 89%, 78% in anti-C. trachomatis and 50%, 50% in anti-C. psittaci respectively. From the results obtained in this study, we concluded that the HITAZYME method which had a very low cross-reactivity to C. pneumoniae is clinically useful in the serodiagnosis of C. trachomatis infections, even if it has a little common antigenicity with C. psittaci antigen.

Development of Serodiagnostic Kit ^|^ldquo;HITAZYME Chlamydia Ab^|^rdquo; for Chlamydia trachomatis Infections Using Extracted Antigen