Summary
A virus called human metapneumovirus (HMPV) is causing more respiratory illnesses in the United States. The cases tend to increase in winter, with recent data showing a significant rise compared to last year. There is no current vaccine or treatment for HMPV.
Key Facts
- HMPV causes respiratory illnesses and is similar to RSV.
- The virus spreads through the air, close contact, or touching contaminated surfaces.
- Cases are increasing, with higher levels than last year from November to March.
- Symptoms include cough, fever, congestion, and can lead to bronchitis or pneumonia.
- There is no vaccine or direct treatment for HMPV.
- Wastewater data from programs like WastewaterSCAN shows high HMPV detections in certain U.S. areas.
- The CDC reported a rise in positive HMPV tests from 0.42% in September 2025 to 5.37% by March 2026.
