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Table 1 Mean number of daily cases in the non-flu seasons for hospitals S, M, and L by unspecified infection and gastrointestinal symptoms.

From: Early detection of influenza outbreaks using the DC Department of Health's syndromic surveillance system

  Hospital S Hospital M Hospital L
Unspecified Infection 3.5 4.8 28.1
Gastrointestinal 9.0 21.9 14.7