Vaccines harness your immune system’s natural ability to detect and destroy disease-causing germs and then “remember” the best way to fight these germs in the future.
https://newsinhealth.nih.gov/special-issues/parenting/safeguarding-our-health
1 https://www.who.int/news-room/events/detail/2019/04/24/default-calendar/world-immunization-week-2019
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