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References

1. CDC. Flu Symptoms. www.cdc.gov/flu/symptoms/symptoms.htm.
2. CDC. Influenza Antiviral Medications: Summary for Clinicians. www.cdc.gov/flu/professionals/antivirals/summary-clinicians.htm.
3. CDC. People at High Risk for Flu Complications. www.cdc.gov/flu/highrisk/index.htm.
4. Nayak J, et al. Cold Spring Harb Perspect Med. 2019;a038430
5. Uyeki TM, et al. Clin Infect Dis. 2019;68:895-902.