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

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.

The patient, an 80-year-old man in Gujarat, is infected with virus. He has no travel history abroad, say officials