In certain countries, DTP has been replaced by DTaP. This newly constructed vaccine contains a modified pertussis toxoid and pertussis antigens. 

Tulane University

Tetanus and diphtheria toxoids are combined with a killed sample of Bordetella pertussis (organism that causes whooping cough). This vaccine is referred to as a combination vaccine, DTP, and provides protection against all three microorganisms. 

Combination Vaccine, DTP

Parham, P. (2009). Vaccination to Prevent Infectious Disease. In 1145902806 862124677 J. Foltin (Ed.), The Immune System (3rd ed., pp. 439-440). New York, New York: Garland Science, Taylor &amp; Francis Group.

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