title: Aberrent group B reactions detected in mixtures of semen and vaginal secretions possibly due to acquired B.
abstract: Routine ABO grouping tests performed on vaginal swabs from a group O female showed the presence of blood group B activity as well as the expected A and H activity after intercourse with her group A partner. The source of the B activity was readily detectable using the Laboratory's routine elution test, but it was not detectable when a monoclonal anti-B was used and detection by the inhibition technique was possible only with a selected antiserum. A possible explanation of the reactions observed is that the acquired B is capable of reacting with only a portion of the antibodies present in normal polyclonal anti-B sera.
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology*; D000368:Aged; D000911:Antibodies, Monoclonal / Q000032:analysis; D003075:Coitus; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007158:Immunologic Techniques; D008297:Male; D011902:Rape; D012661:Semen / Q000276:immunology* / Q000382:microbiology; D013997:Time Factors; D014621:Vagina / Q000276:immunology*; D014626:Vaginal Smears
chemical_list: D000017:ABO Blood-Group System; D000911:Antibodies, Monoclonal