Which vaccination is contraindicated during severe immunosuppression?

• A. Inactivated vaccines are contraindicated.
• B. Live vaccines (MMR, varicella) are generally contraindicated in severely immunosuppressed HIV patients.
• C. All vaccines are contraindicated.
• D. Vaccinations should be given only after ART is stopped.

Answer: (B)

The important idea here is how vaccines interact with immune function. Live vaccines contain weakened but replicating organisms. In someone with severe immunosuppression from HIV, the immune system may not control even these attenuated organisms, raising the risk that the vaccine itself could cause illness. That’s why live vaccines such as MMR and varicella are generally avoided when HIV infection has progressed to a severe level of immunosuppression.

Inactivated vaccines, on the other hand, do not contain replicating pathogens, so they don’t pose this risk and are safe to give to people with HIV, though their immune response may be weaker. This is why vaccination plans for HIV patients emphasize inactivated vaccines (like influenza, pneumococcal, and Hepatitis B) and consider live vaccines only after immune recovery on ART, not by stopping ART. Stopping ART to vaccinate would not be appropriate and can be harmful.

So, the best answer reflects that live vaccines are contraindicated during severe immunosuppression, while inactivated vaccines remain appropriate options with consideration of immune status.