Pregnancy is contraindicated for which vaccines?

Pregnancy is contraindicated for which vaccines?

• A. MMR only
• B. All of MMR, Varicella, and HPV
• C. Varicella only
• D. HPV only

Answer: (B)

The key idea is that vaccines are avoided in pregnancy when there could be risk to the fetus, especially with vaccines that use live components. Measles, mumps, and rubella (MMR) and varicella vaccines are live attenuated vaccines. Even though the viruses are weakened, they can still potentially affect fetal development, so they are contraindicated during pregnancy. HPV vaccine is not a live vaccine, but safety data in pregnant people are limited and guidelines generally recommend deferring vaccination until after delivery. In exams that list all three as contraindicated, the reasoning is to avoid any vaccine during pregnancy that could pose risk or lack robust safety data, hence the inclusion of all three. If pregnancy is planned, these vaccines are given beforehand; if inadvertent vaccination occurs, clinicians review timing and follow current guidelines.

The key idea is that vaccines are avoided in pregnancy when there could be risk to the fetus, especially with vaccines that use live components. Measles, mumps, and rubella (MMR) and varicella vaccines are live attenuated vaccines. Even though the viruses are weakened, they can still potentially affect fetal development, so they are contraindicated during pregnancy. HPV vaccine is not a live vaccine, but safety data in pregnant people are limited and guidelines generally recommend deferring vaccination until after delivery. In exams that list all three as contraindicated, the reasoning is to avoid any vaccine during pregnancy that could pose risk or lack robust safety data, hence the inclusion of all three. If pregnancy is planned, these vaccines are given beforehand; if inadvertent vaccination occurs, clinicians review timing and follow current guidelines.