India, March 20 -- Cases of human metapneumovirus (HMPV), a relatively lesser-known respiratory infection, are rising across the United States, prompting increased monitoring by health authorities. Data shared by the Centers for Disease Control and Prevention shows the virus accounted for around 5% of positive respiratory tests nationwide in early March, with wastewater surveillance also pointing to heightened activity.

The surge, observed since fall 2025, has drawn attention because the illness often mimics the common cold, making it harder to distinguish without testing.

Officials say that while most cases remain mild, the absence of a vaccine or specific antiviral treatment adds to concerns, especially for vulnerable populations.

HM...