165. A critical situational public health report on the effectiveness of a vaccination program relies solely on the proportion of vaccinated individuals who did not get sick. What is the urgency for a biostatistician to advise caution?

To immediately celebrate the program's success.
To urgently explain that this is a misleading metric and that a proper comparison with unvaccinated individuals or a calculation of vaccine effectiveness is critically needed.
To ignore the unvaccinated group.
To assume correlation implies effectiveness.

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