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Story summary
- Human metapneumovirus (HMPV) infections surged in the United States, rising from 0.42% in late September 2025 to 5.37% by early March 2026.
- The rise follows a seasonal pattern, peaking in winter and lasting into spring.
- HMPV causes respiratory illness, especially in older adults and those with chronic conditions.
- Symptoms include cough, fever, and shortness of breath.
- There is no vaccine for HMPV.
