Infectious Disease OutbreaksInfection

RSV season timing and severity update

April 6, 2026CDC

CDC says RSV is not more severe than recent seasons, but later-than-expected activity means elevated levels may persist into April, affecting planning for clinics and hospitals.

Respiratory syncytial virus (RSV) is not causing more severe illness than in recent seasons.
because RSV activity began later than expected across much of the U.S., higher levels may continue into April in many regions.
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