Which of the following patterns is NOT described as a signal of biological terrorism in syndromic surveillance?

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In syndromic surveillance, signals of biological terrorism come from patterns across time, place, and clinical presentation, not from a single odd case. A cluster of respiratory illnesses in a city during flu season can indicate an abnormal surge that prompts investigation, especially if it exceeds the expected baseline. A group of illnesses with similar symptoms at a similar stage of progression points to a common exposure to a single agent, which is a hallmark of a coordinated release. Several outbreaks in different locations suggest a disseminated event rather than isolated spread.

A single atypical illness in a defined population lacks a pattern and is more likely to be a random or unrelated occurrence, so it does not meet the pattern-based signals typically used to flag potential bioterror events.