vaccine efficacy

How is Vaccine Efficacy Calculated?

Vaccine efficacy is calculated using the formula:
\[ VE = \left( 1 - \frac{ARV}{ARU} \right) \times 100 \]
where ARV is the attack rate in the vaccinated group, and ARU is the attack rate in the unvaccinated group. This calculation provides a percentage that indicates how much the vaccine reduces the risk of disease.

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