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.

Authorities in China said they are monitoring cases of human metapneumovirus, or HMPV, after a reported increase inside the country, according to Reuters. Although cases are increasing at a rapid rate,

In China, reports of HMPV infections have indeed been rising in recent weeks in the more northerly regions. But so have reports of all the other respiratory pathogens including seasonal flu, rhinovirus and RSV.

HMPV is a respiratory virus that regularly circulates during cold and flu season. It is spread through coughing, sneezing and coming into contact with contaminated s