Which vaccine should NOT be given to breastfeeding mothers in the postpartum period?

Breastfeeding mothers in the postpartum period should avoid the smallpox vaccine. This recommendation is based on the fact that the smallpox vaccine is a live virus vaccine, which poses a risk of transmission to the infant through breast milk or direct skin contact. The smallpox virus can lead to serious complications in infants who are not yet vaccinated or immunized against the virus.

In contrast, the MMR vaccine (measles, mumps, and rubella), varicella vaccine (chickenpox), and tetanus toxoid vaccine are considered safe for breastfeeding mothers. MMR and varicella vaccines are also live attenuated vaccines but are not contraindicated for breastfeeding, as the risk of transmitting the live attenuated virus through breast milk is negligible. Tetanus toxoid is an inactivated vaccine and is absolutely safe during breastfeeding.

Understanding the types of vaccines and their implications for breastfeeding helps to ensure the safety and health of both the mother and the infant during the postpartum period.