[Frequency of anti-sperm antibodies demonstrated by classical tests for sperm antibodies in patients with unexplained infertility].

The aim of the present investigation was to establish the frequency of sperm antibodies in patients with etiologically unexplained infertility, and to compare the demonstrated frequencies with the results from y control group of y healthy blood donors, as well as with the results of other investigators. The gelatin agglutination test of Kibrick and the tray agglutination test of Friberg were applied to test 244 sera from infertile patients and 50 sera from healthy blood donors at the Laboratory of Immunology of Reproduction, Department of Biology, Medical University of Sofia. For the infertile patients, relevant sperm antibody titers were demonstrated in 2.