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[The effectiveness of immunological methods in the diagnosis of leptospirosis].

The effectiveness of Leptospira antigenic erythrocyte diagnosticum increases 4- to 8-fold due to the preliminary activation of erythrocytes and Boivin's antigen with 0.001-0.002 M solution of potassium periodate. ELISA with the use of conjugate based on antiglobulin serum and catalase is twice as sensitive as ELISA with conjugate on the basis of penicillinase, 3 times as sensitive as ELISA with conjugate on the basis of Leptospira hyperimmune serum and catalase and 10-20 times as sensitive as the passive hemagglutination test and the microagglutination and lysis test.