Cases of human metapneumovirus (HMPV) and other seasonal viruses are on the rise across the northern hemisphere in early 2025, according to the World Health Organization. While news reports and social media videos have caused concern about a potential HMPV outbreak in China,

The WHO said Chinese data up to Dec 29 showed detections of HMPV, seasonal influenza, rhinovirus, and respiratory syncytial virus (RSV) have all increased in recent weeks, particularly in northern parts of China. Influenza is currently the most commonly reported cause of disease, it said.

As China experiences a rise in respiratory infections this winter, one little-known virus has gotten a lot of attention – and some people may worry whether the rise in cases could be felt more broadly around the world.