Are vaccines an effective tool to prevent disease?

Yes. Vaccines are one of the most effective and cost‑efficient tools we have to prevent infectious disease.

Why they work

•They train your immune system to recognize a pathogen before you meet the real thing, so you can fight it off quickly and often without symptoms.

•High vaccination coverage also protects people who can’t be vaccinated (herd immunity), reducing spread in the whole community.

Real‑world impact

•Smallpox was eradicated globally through vaccination.

•Paralytic polio has been reduced by over 99% since the late 20th century and remains close to eradication in most of the world.

•Measles, whooping cough, and other childhood diseases cause far fewer hospitalizations and deaths where vaccination rates are high.

•HPV vaccines cut rates of cervical and other HPV‑related precancers and cancers.

•Seasonal flu and COVID‑19 vaccines reduce the risk of severe illness, hospitalization, and death, even when they don’t fully prevent infection.

Safety

•Vaccines are rigorously tested and continually monitored. Typical side effects (sore arm, fever, fatigue) are short‑lived; serious adverse events are very rare, and the risks from the diseases they prevent are much higher.

Limits to keep in mind

•Protection can wane over time (boosters may be needed).

•Some vaccines don’t block every infection but still greatly reduce severity and spread.

•Community protection depends on high uptake.

Bottom line: Vaccines substantially lower the risk of getting sick and of serious outcomes, benefiting both individuals and the wider community.

Are vaccines an effective tool to prevent disease?

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