- Presence of clinical signs and/or symptoms consistent with an acute illness compatible with influenza infection; a measured temperature of ≥ 38.0°C (100.4°F) oral, or ≥ 38.6°C (101.4°F) rectal or tympanic and recent onset of at least one of the following: rhinorrhea or nasal congestion, sore throat or cough. Measured temperature can include fever meeting the above criteria as reported by the subject or their parent, guardian or legally authorized representative in the 24 hours prior to Screening. The requirement for fever is waived for any subject with influenza infection already confirmed by laboratory tests (including Rapid Antigen Tests).