Secondary attack rates are often used to estimate how infection spreads among close contacts. They seem to provide a focused measure of transmission in households, schools, workplaces, and other settings. But what if the number is being shaped just as much by contact tracing and testing rules as by the pathogen itself? 

In this episode, we break down why secondary attack rates often mislead, how inconsistent contact definitions distort interpretation, and why outbreak metrics cannot be separated from investigation design.

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