A preparation of killed microorganisms, living attenuated organisms, or living fully virulent organisms that is administered to produce or artificially increase immunity to a particular disease

CDC: Immunization Schedules

CDC provides easy-to-read schedules for all ages in easy-to-re

CDC: Immunization Side-Effects

Any vaccine can cause side effects. For the most part these are minor (for example, a sore arm or low-grade fever) and go away within a few days.

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