Two methods of third generation are described: the inverse passive agglutination test and the immunoenzymologic method of the ELISA test. From 500 serum tests, it is suggested that ELISA test has a sensibility of 5,2 p. 100 superior to that of the inverse passive agglutination test which, in addition gives 1 p. 100 of false positive results. It must be noted that the ELISA test requires a very careful technical skill.
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