vaccine effectiveness studies

Vaccine effectiveness studies assess how well a vaccine protects against illness in real-world conditions. Researchers compare the rates of infection in vaccinated people to those who are unvaccinated or vaccinated with different vaccines. By analyzing data on illness rates, hospitalizations, and other health outcomes, these studies determine how effective the vaccine is at preventing disease, reducing severity, and decreasing transmission. Findings help guide public health decisions, vaccination policies, and community health strategies to maximize the benefits of vaccination programs.