When can I go back to work after the flu?
Last updated September 3, 2026.
The CDC's rule: back to work when, for at least 24 hours, you are fever-free without medication and your symptoms are improving overall - typically five to seven days into the flu. A rebounding fever resets the clock and deserves a medical call, since improve-then-crash can signal a secondary infection. After returning, take 5 more days of added precautions - mask, distance, ventilation - since shedding continues into the following week, and pace the energy side with a graduated return.
What to do
- Run the 24-hour test honestly. No fever reducers masking the number.
- Respect a rebound. Fever returning after improvement: call the doctor.
- Keep 5 days of added care at work. Mask in close quarters; extra distance from high-risk colleagues.
- Plan a soft first day. Flu fatigue outlasts contagiousness - half-days if you can.
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