Influenza-associated hospitalizations Patients who have a hospital admission date 14 days or fewer after a positive influenza test or a hospital admission date three days or fewer before a positive influenza test.
Suspected influenza outbreak: Two cases of influenza-like illness (ILI) within a one-week period without a positive test for influenza. When influenza is circulating locally, acute febrile respiratory illness in several residents within a short time frame should be considered highly suspect for influenza, regardless of whether the affected residents have been vaccinated.
Confirmed influenza outbreak: At least two residents with a positive influenza test. Note: This outbreak definition is different from previous seasons due to the co-circulation of COVID-19; the previous definition required only one positive influenza test among 2 or more residents with ILI.