Holt's diphtheria toxoid (P.T.A.P.) A1 PO4 content, purity, ageing, and durability of immunity.
D000375:Aging; D004168:Diphtheria Toxoid; D006801:Humans
D004168:Diphtheria Toxoid
DIPHTHERIA TOXOID/Holt's; HOLT DIPHTHERIA TOXOID; PTAP