[The passive hemagglutination test in the diagnosis of syphilis].

Studies were carried out on the comparative value of passive haemaglutination, cardiolipin and treponema tests in a total number of 4327 sera syphilitic patients in various stages of the disease and apparently normal subjects or free of syphilis. The results demonstrated the specificity and sensitivity of passive haemagglutination in all the stages of syphilis. In view of the qualities and simplicity of the test, the author recommends it as a screening test combined with a micromethod using the cardiolipin antigen (flocculation test).