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When reporting on surveillance programs, look for the denominator

Surveillance is the process or system for tracking cases of risk factors, medical conditions, disease cases, adverse events, etc. Journalists often must rely on surveillance programs to report on outbreaks or side effects or in doing investigative research, but it’s important to know what kind of surveillance you’re using.

Tara Haelle explains two basic types of surveillance and why understanding the difference is essential.

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