Wastewater data shows highly contagious HMPV virus spreading across U.S. West Coast
Wastewater surveillance data show that the respiratory virus human metapneumovirus (HMPV) is spreading across parts of the U.S. West Coast, particularly in Northern California communities.
The virus, first identified in 2001 and related to respiratory syncytial virus (RSV), is monitored through the National Wastewater Surveillance System, which analyzes sewage to detect disease trends.
HMPV cases surged in January and remain elevated in early March, with rising levels also reported in the Midwest and Northeast.
There is currently no vaccine or specific treatment, and symptoms commonly include cough, fever, nasal congestion and shortness of breath, though severe illness can occur in high-risk groups.
Health officials say the virus spreads through close contact and respiratory droplets, urging preventive measures such as proper handwashing, sanitizing surfaces, covering coughs and avoiding contact with others when sick.
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