Vaccine efficacy studies

Vaccine efficacy studies assess how well a vaccine works in preventing disease in a controlled environment. Researchers compare the infection rates between vaccinated and unvaccinated groups. For example, if a vaccine shows 90% efficacy, this means it reduces the risk of getting the disease by 90% in those vaccinated compared to those who are not. These studies help determine how effective a vaccine is at preventing illness and inform public health decisions about its use in broader populations. Such studies are essential for ensuring vaccines are both safe and effective before public deployment.