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The authors assessed sperm-agglutination antibodies in infertile couples in 1980-1988, using the Kibrick test: in sera from 699 female patients, a positive result was found in 142 (20%) women, in sera from 352 men, in 6 (1.7%) sperm-agglutination antibodies were detected. Using the microagglutination test, they examined sera of 3501 sterile women; in 273 (6.8%) they found sperm agglutination up to 1:16, above titre 1:32 in 12 (0.4%) of the patients. Using the same test, they examined sera of 2803 men and found sperm-agglutination up to 1:16 in 21 (0.7%) and above 1:32 in 6 (0.3%). The most frequent type of sperm agglutination is aggregation of the heads; aggregation by tails or mixed agglutination are less frequent. In 3252 sterile women where no sperm-agglutination antibodies were found Kremer's test was negative in 1145 patients. The authors analyzed in 196 sterile women the ovulation mucus by the microagglutination test and found a high anti-spermatozoidal activity in 24 (12%) women. Concurrently an indirect MAR test was made. Antibodies against sperm cells were found in 24 (12.2%) of specimens in sIgA, in 8 (4.1%) in IgG, in 2 (2%) in IgM and in one sample (0.5%) in IgE. The indirect MAR-test in sera of 325 sterile women revealed a predominance of anti-spermatozoidal antibodies in IgG, in men in IgA. In seminal plasma the authors detected antibodies against sperm cells in sIgA. In seminal plasma the authors detected antibodies against sperm cells in sIgA and IgE.