As China continues to monitor an increase in cases of human metapneumovirus (HMPV), here's what you need to know about the illness.

Five years after the first cases of COVID-19, reports of hMPV, an obscure respiratory virus in China may understandably raise concerns.

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.