title: Standardization of tetanus toxoid combined with pertussis vaccine. II. Some considerations on the standard toxoid for the assay of combined vaccine.
mesh_terms: D000818:Animals; D004168:Diphtheria Toxoid; D006168:Guinea Pigs; D007928:Lethal Dose 50; D010567:Pertussis Vaccine; D013745:Tetanus Toxoid / Q000592:standards* / Q000633:toxicity
chemical_list: D004168:Diphtheria Toxoid; D010567:Pertussis Vaccine; D013745:Tetanus Toxoid