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How vaccines actually work: A simple guide

Inactivated vaccines

Inactivated vaccines use a germ that has been killed, so it can't make you sick. This type of vaccine can protect against:

  • Flu, also called influenza.
  • Hepatitis A.
  • Polio.
  • Rabies.

Inactivated vaccines may not provide protection as strong or as long as that of live vaccines. They often require more than one dose to work their best.