Which vaccines are generally advised against during pregnancy?

The correct answer indicates that live vaccines, such as the MMR (measles, mumps, and rubella) and varicella (chickenpox) vaccines, are generally advised against during pregnancy. The rationale lies in the nature of live attenuated vaccines, which contain a weakened form of the virus. While these vaccines are safe for most populations, administering them during pregnancy poses a theoretical risk of causing the disease in a developing fetus due to the nature of the vaccine.

In contrast, inactivated or recombinant vaccines, which do not contain live pathogens, are typically considered safe during pregnancy. For example, vaccines like the influenza vaccine and the Tdap (tetanus, diphtheria, and pertussis) vaccine are recommended in specific circumstances during pregnancy to protect both the mother and the infant from severe disease.

The other choices do not accurately reflect the guidelines regarding vaccination during pregnancy. Stating that all vaccines or only the influenza vaccine are advised against does not take into account the important distinction between live and inactivated vaccines and their implications for pregnant individuals.