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.

Human metapneumovirus, also known as HMPV, can cause upper and lower respiratory disease in people of all ages, and data from the Chinese Centers for Disease Control and Prevention released last week shows that the country has seen more cases in recent weeks.

But HMPV typically circulates in the Northern Hemisphere in winter, and China’s CDC data shows that there have also been rises in a number of other common respiratory infections, including the seasonal flu and respiratory syncytial virus, or RSV.