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Influenza-associated Hospitalizations
2012 Case Definition

CSTE Position Statement(s)

  • 11-ID-07

Clinical Criteria

  • Hospital admission date 14 days or less after a positive influenza test, OR
  • Hospital admission date 3 days or less before a positive influenza test

Laboratory Criteria for Diagnosis

Evidence of a positive influenza test by at least one of the following methods:

  • Positive viral culture for influenza
  • Positive immunofluorescence antibody staining (Direct [DFA] or indirect [IFA]) for influenza
  • Reverse transcriptase polymerase chain reaction (RT-PCR) positive for influenza
  • Serologic testing positive for influenza
  • A positive, unspecified influenza test noted in the medical chart (e.g., a written note in the admission H&P or discharge summary)
  • A positive commercially available rapid diagnostic test for influenza

Case Classification


A case that meets the clinical and laboratory evidence criteria.