What component is included in the Tdap vaccine?

The Tdap vaccine, which stands for Tetanus, Diphtheria, and Pertussis, specifically includes components aimed at protecting against these three diseases. In this context, the inclusion of pertussis bacteria is essential because the vaccine provides immunity against whooping cough, a highly contagious respiratory disease caused by the Bordetella pertussis bacteria.

The other options listed pertain to different vaccines: measles virus is contained in the MMR vaccine (Measles, Mumps, and Rubella), poliovirus is part of the poliovirus vaccine, and hepatitis B virus is included in the hepatitis B vaccine. Therefore, they do not relate to the components of the Tdap vaccine. Understanding the specific components of vaccines is crucial in ensuring appropriate immunization and protection against infectious diseases.