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The DPT vaccine or DTP vaccine is a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis , and tetanus. The vaccine components include diphtheria and tetanus toxoids and either killed whole cells of the bacterium that causes pertussis or pertussis antigens. The whole cells or antigens will be depicted as either "DTwP" or "DTaP", where the lower-case "w" indicates whole-cell inactivated pertussis and the lower-case "a" stands for “acellular”.
In the United States, the DPT vaccine was administered as part of the childhood vaccines recommended by the Centers for Disease Control and Prevention until 1996 when the acellular DTaP vaccine was licensed for use.
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