[The biological diagnosis of Chlamydia infections].

Chlamydia infections are becoming more and more common. The diagnosis can be confirmed in the laboratory by direct demonstration of the inclusion or by Giemsa'a technique, which is long and associated with false positive results. Much better is the technique of immunofluorescence which has been made specific and precise by the use of monoclonal antibodies. Cell culture has the advantage of being able to identify the strain, but it is long and expensive. Measuring antibody titres by immunofluorescence or by the ELISA technique can be performed in all laboratories. It is very valuable in the diagnosis of upper gynecological infections, such as salpingitis and sterility and in the diagnosis of neonatal pneumonia.