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Vaccine Efficacy Calculator
Epidemiological Vaccine Efficacy & Risk Reduction Assessment
Epidemiology Guidelines: Vaccine Efficacy (VE) is calculated as $[(AR_u - AR_v) / AR_u] \times 100$, where $AR_u$ is the attack rate in the unvaccinated group and $AR_v$ is the attack rate in the vaccinated group. Enter cohort infection counts and total group sizes below.
Cohort Infection Data Input
Calculation Results
⚠️ Not medical advice. For epidemiology, clinical trials, and public health reference only. Vaccine evaluation, statistical analysis, and public health policy decisions must be supervised strictly by qualified epidemiologists, biostatisticians, or health authorities.