Immunization

Vaccination is the administration of a vaccine to help the immune system develop immunity from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's adaptive immunity, they help prevent sickness from an infectious disease.

When a sufficiently large percentage of a population has been vaccinated, herd immunity results.
Herd immunity protects those who may be immunocompromised and cannot get a vaccine because even a weakened version would harm them.

Back to Parenting & Care →

Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

KIDBEAST

Kids activities, parenting tips, and family-fun guides — plus the calculators every parent needs.

Get new guides by emailOccasional emails. No spam. Unsubscribe anytime.

InformationAbout Contact Privacy Policy Terms of Service Disclaimer Affiliate Disclosure Cookie Policy

Every species, image, fact, and figure is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.