Which vaccination is NOT currently recommended by the Centers for Disease Control and Prevention (CDC)?

The smallpox vaccination is not currently recommended for the general public because the disease has been eradicated since 1980, following a successful global vaccination campaign. The CDC no longer advises routine smallpox vaccinations, as the risk of disease transmission and potential adverse effects from the vaccine outweigh any benefits for those who are not at high risk, such as certain military personnel or healthcare workers who may come into contact with variola virus in a laboratory setting.

In contrast, the other vaccines listed—tetanus, diphtheria, pertussis (Tdap), hepatitis B, and measles, mumps, rubella (MMR)—are all routinely recommended by the CDC. These vaccinations protect individuals against diseases that are still present and can have severe health consequences.