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Chlamydia Trachomatis is one of the most frequently bound aetiological agents in acute salpingitis. Chlamydia infection often runs asymptomatically or with slight symptomatology, so patients do not call in their doctor. This hypothesis is backed by the observation that serum antibody positivity for Chlamydia and tubal infertility are often found together. The purpose of the present study was to determine the positivity of serum antibodies for Chlamydia in infertile women observed at this Centre and compare it with a control group of non-sterile patients. Further, in those patients in whom antibody positivity exists, it was also proposed to seek tubal lesions at hysterosalpingography or coelioscopy. The antibody titre in infertile women is compared with that of the control group. The study was carried out in 30 sterile women and in 30 patients in the definitely fertile control group. The "Ipazyme" (Sorin) immunoperoxidase test was used to seek IgG and IgA anti-Chlamydia antibodies. The geometric mean of the antibody titre was calculated in those women with a titre equal to or greater than 64 for IgG antibodies and equal to or greater than 16 for IgA antibodies. It is now intended to study whether the titre is higher in infertile women compared to the control group and if positivity is more significant in these patients.