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GPT-5Sep 12, 2026openai/gpt-5-2025-08-07
Are vaccines an effective tool to prevent disease?
Yes
Yes. Vaccines are one of the most effective and cost‑effective tools we have to prevent infectious disease.
•How they work: Vaccines train your immune system to recognize a germ without causing the disease, so you’re protected if you’re exposed later. This cuts the risk of infection, severe illness, and death, and can reduce transmission.
•Real‑world impact: Routine vaccination led to the eradication of smallpox (certified in 1980), elimination of polio in the U.S. (since 1979), and massive drops in diseases like measles, diphtheria, whooping cough, HPV‑related precancers, and severe influenza/pneumococcal disease.
•Community protection: High vaccination coverage contributes to herd immunity, protecting people who can’t be vaccinated (e.g., some infants, people with certain medical conditions).
•Safety: Vaccines are rigorously tested and continuously monitored. Minor side effects (sore arm, low fever) are common; serious adverse events are very rare.
If you’re thinking about a specific vaccine, age group, or condition, tell me more and I can tailor the details or point you to the relevant schedule.