title: The optimum frequency of tetanus toxoid boosters.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D008404:Massachusetts; D013745:Tetanus Toxoid / Q000008:administration & dosage*
chemical_list: D013745:Tetanus Toxoid