Seasonal influenza
Influenza precautions
- How long
- 7 days after illness onset or 24 hours after fever and respiratory symptoms resolve, whichever is longer
- Room
- Private room or area; consult infection prevention before cohorting
- PPE
- Facemask on room entry
- Transport
- Patient wears a facemask if possible
- Aerosol-generating procedures
- Only when necessary, with as few staff as possible, in an AIIR when feasible
Good to know
- CDC’s seasonal influenza guidance says facilities may keep Droplet Precautions longer for young children or severely immunocompromised patients, who can shed virus for longer.
- Patients should be discharged when clinically ready — not held for the duration of Droplet Precautions. Tell receiving facilities and transport staff about the diagnosis and current precautions.
- CDC’s Appendix A points to this separate seasonal influenza guidance; pandemic influenza is listed under Droplet + Standard.
What CDC’s table says
Verbatim from CDC’s Appendix A, with bibliography numbers removed.
Influenza — Human (seasonal influenza)
Duration—
See Prevention Strategies for Seasonal Influenza in Healthcare Settings for current seasonal influenza guidance.
Influenza — Pandemic Influenza (also a human influenza virus)
DropletStandardDuration—
See Interim Guidance for Infection Control Within Healthcare Settings When Caring for Confirmed Cases, Probable Cases, and Cases Under Investigation for Infection with Novel Influenza A Viruses Associated with Severe Disease for current pandemic influenza guidance.
Test yourself: a CIC-style question
How long should Droplet Precautions continue for a hospitalized patient with seasonal influenza?
- 24 hours after starting antiviral treatment
- 7 days after illness onset or 24 hours after fever and respiratory symptoms resolve, whichever is longer
- Until a negative influenza PCR
- 14 days after admission
Show answer
B. 7 days after illness onset or 24 hours after fever and respiratory symptoms resolve, whichever is longer
CDC’s seasonal influenza guidance sets 7 days after onset or 24 hours after resolution of fever and respiratory symptoms, whichever is longer, while the patient is in a healthcare facility.
Questions like this come up in the Preventing and Controlling the Transmission of Infectious Agents domain of the CIC® exam. The 654 questions in the app each come with a written explanation.
FAQ
- What precautions are needed for Influenza?
- Droplet + Standard. Room: Private room or area; consult infection prevention before cohorting. PPE: Facemask on room entry. Transport: Patient wears a facemask if possible. Aerosol-generating procedures: Only when necessary, with as few staff as possible, in an AIIR when feasible.
- How long do Influenza precautions last?
- 7 days after illness onset or 24 hours after fever and respiratory symptoms resolve, whichever is longer.
Sources
- CDC. Infection Prevention and Control Strategies for Seasonal Influenza in Healthcare Settings
- CDC. Appendix A: Type and Duration of Precautions Recommended for Selected Infections and Conditions (2007 Guideline for Isolation Precautions, updated September 2024)
Checked against CDC on October 21, 2026. For education and CIC® exam preparation only — not a substitute for your facility’s infection prevention policies, your state or local health department, or clinical judgment. CBIC and CDC do not endorse this tool.