How do vaccines work?
Vaccines help the immune system learn a protective response against a specific germ.
Symptoms, causes and assessment
Vaccines use different approaches, including weakened or inactivated germs, parts of germs or instructions to make an antigen. Protection varies by disease and person; no vaccine should be assumed to prevent every infection completely.
Care and when to seek help
Schedules depend on age, pregnancy, health and location. Most side effects are mild, but serious reactions need assessment. Check the current official schedule with a clinician.
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