What Metrics Are Used to Measure Vaccine Effectiveness?
Several metrics are used to measure vaccine effectiveness, including:
Vaccine efficacy: Measured in controlled clinical trials, it represents the reduction in disease incidence in a vaccinated group compared to an unvaccinated group. Real-world effectiveness: Assessed through observational studies post-licensure, it evaluates how well the vaccine performs in a broader, more diverse population. Herd immunity: The indirect protection provided when a significant portion of the population is immune, reducing the spread of the disease.
