Specific IgM and IgA antibodies in Chlamydia trachomatis infections in adults

: The authors have compared the prevalence of Chlamydia trachomatis specific serum IgM and IgA antibodies in two populations with Chlamydia positive total antibodies. The first population, P1 had a positive direct diagnosis, and the second had a negative one. IgM antibodies were found in 13.5 p. cent of P1 only. IgA were found in 51.9 p. cent of P1 versus 15.7 p. cent of P2. The interest of IgA detection is discussed, particularly towards deep infections where they could be an argument of an active infection.