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GPT-5Oct 21, 2026openai/gpt-5-2025-08-07
Are vaccines an effective tool to prevent disease?
Yes. Vaccines are one of the most effective tools we have to prevent infectious disease.
•How they work: Vaccines train your immune system to recognize a pathogen before you’re exposed, so you’re less likely to get sick, spread it, or develop severe illness.
•Real‑world impact: Vaccination eradicated smallpox worldwide, drove polio to the brink of eradication, and has sharply reduced diseases like measles, whooping cough, and meningitis where coverage is high.
•Effectiveness varies: Different vaccines prevent infection, severe disease, or both to different degrees; protection can wane over time, so some require boosters.
•Safety: Vaccines are extensively tested and continuously monitored. Serious side effects are rare, while the benefits—preventing illness, complications, hospitalizations, and deaths—are large.
•Community protection: High vaccination rates reduce spread, protecting infants, older adults, and people with weakened immune systems.
If you’d like, tell me which diseases you’re thinking about and I can share specific effectiveness numbers and schedules (for example, the U.S. CDC recommendations).