Reports of human metapneumovirus (HMPV), a common respiratory illness that causes flu- and cold-like symptoms, are growing across the Northern Hemisphere, including in China, though neither the World Health Organization (WHO) nor the CDC have expressed alarm at this time.

The attention being paid to a Chinese outbreak of a virus often confused with flu is a sign that respiratory infection tracking is improving.

As of January 2025, in both the U.S. and China, an increasing concern has developed over human metapneumovirus (HMPV). Notable upticks in reports have been detected.

Most cases of HMPV are mild, but infection can increase health risks—particularly for the elderly, young children and people with low immunity. In extreme cases, it can lead to severe complications.