Which vaccine contains whole-cell pertussis and is used in some countries but not in the United States?

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Multiple Choice

Which vaccine contains whole-cell pertussis and is used in some countries but not in the United States?

Explanation:
Whole-cell pertussis is in the older diphtheria-tetanus-pertussis formulation known as DTP. This vaccine uses whole-cell pertussis components and has been largely replaced in the United States by the acellular pertussis version (DTaP) due to better tolerability and fewer reactogenic side effects. Some countries continue to use DTP because of cost, supply, or policy differences. The other vaccines listed either use acellular pertussis (DTaP, Tdap) or exclude pertussis altogether (Td), so the one that contains whole-cell pertussis is DTP.

Whole-cell pertussis is in the older diphtheria-tetanus-pertussis formulation known as DTP. This vaccine uses whole-cell pertussis components and has been largely replaced in the United States by the acellular pertussis version (DTaP) due to better tolerability and fewer reactogenic side effects. Some countries continue to use DTP because of cost, supply, or policy differences. The other vaccines listed either use acellular pertussis (DTaP, Tdap) or exclude pertussis altogether (Td), so the one that contains whole-cell pertussis is DTP.

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