Influenza-like illness (ILI) is defined as a fever of 100.0°F or greater and cough or sore throat (in the absence of a known disease other than influenza).

When to report

Threshold 1. For all schools (including elementary): The number of students with ILI who are absent or sent home reaches 5 percent of the total school enrollment on a given day (e.g., a school of 600 students should report when 5 percent of their total enrollment (30 students) with ILI are absent or sent home or 600 x .05 = 30). Please include all students attending school in-person or via the hybrid model.


Threshold 2. For elementary schools only: Three or more students with ILI from the same classroom or cohort are absent or sent home on a given day.

  • Report one time per outbreak when either of the above thresholds is met throughout the year.
  • Do not report subsequent days of the same outbreak. When reporting additional outbreaks during the same season, make sure that ILI activity has returned to below threshold levels for at least 3 weeks. Report a new outbreak if you reach the threshold again after a minimum of three weeks.
  • If symptoms of illness are unknown for an absent student, include this student in your count of ILI absences.
  • Do not include students that are quarantined for COVID-19 in ILI numbers unless they report symptoms.
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