title: New approaches on tetanus immunization: naturally acquired immunity. Preliminary report.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001938:Brazil; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008431:Maternal-Fetal Exchange; D008875:Middle Aged; D011247:Pregnancy; D013742:Tetanus / Q000276:immunology* / Q000517:prevention & control; D013745:Tetanus Toxoid; D014611:Vaccination
chemical_list: D013745:Tetanus Toxoid