Because Vaccines Prevent Disease.
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Because Vaccines Are Tested for Safety. Frequently.
Step 1: Clinical Trials
Step 2: ACIP sign off.
Step 3: Continuous Monitoring
Because Some People Can’t Be Vaccinated
Herd immunity is an important concept for people who can’t be vaccinated, either because they are allergic to vaccine components, are immunocompromised (like people with cancer or HIV), or for another reason (infants and pregnant mothers). Vaccines.gov explains herd immunity:
Because We Know They Work