title: Natural antibodies in healthy adults.
abstract: The serum of 100 adults living in Budapest was examined for isohaemagglutinin titre with haemaglutination, for staphylococcal-antitoxin titre with haemolysis inhibition and for bacterial antibody titre against 17 different groups of bacteria with passive haemagglutination. Antibody levels in males, except for certain bacterial antibodies, were somewhat lower than in females. The antibody titres, especially in men, decreased gradually from 20 to 50 years of age and were usually lower in Rh negative than in Rh positive persons.
mesh_terms: D000017:ABO Blood-Group System; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000907:Antibodies, Bacterial / Q000032:analysis*; D000942:Antigens, Bacterial; D000992:Antitoxins / Q000032:analysis; D004926:Escherichia coli / Q000276:immunology; D005260:Female; D006386:Hemagglutination Tests; D006388:Hemagglutinins / Q000032:analysis; D006461:Hemolysis; D006801:Humans; D006814:Hungary; D007518:Isoantibodies / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D009169:Mycobacterium tuberculosis / Q000276:immunology; D011550:Pseudomonas aeruginosa / Q000276:immunology; D012204:Rh-Hr Blood-Group System; D012482:Salmonella paratyphi A / Q000276:immunology; D012485:Salmonella typhi / Q000276:immunology; D012737:Sex Factors; D012763:Shigella flexneri / Q000276:immunology; D012764:Shigella sonnei / Q000276:immunology; D013210:Staphylococcus / Q000276:immunology; D014118:Toxins, Biological; D014373:Tuberculin; D014734:Vibrio cholerae / Q000276:immunology
chemical_list: D000017:ABO Blood-Group System; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D000992:Antitoxins; D006388:Hemagglutinins; D007518:Isoantibodies; D012204:Rh-Hr Blood-Group System; D014118:Toxins, Biological; D014373:Tuberculin