Are adult vaccines safe?

Vaccines are one of the safest ways to protect health. Vaccines go through years of testing before they are licensed by the Food and Drug Administration (FDA). Once licensed, research is reviewed by experts to make recommendations on whom to vaccinate. Even after licensure, the CDC and FDA continue to monitor vaccine safety. Vaccines can be received even if individuals are taking prescription medicines. However, live vaccines which include measles-mumps-rubella (MMR) and varicella (chickenpox) may not be administered to those who have a suppressed immune system.

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1. Do I really need vaccines?
2. How well do adult vaccines work?
3. Are adult vaccines safe?
4. What are the possible risk?