The WHO has downplayed concerns over a rise in HMPV cases, saying outbreaks are normal during winter in the Northern Hemisphere.

The Centers for Disease Control and Prevention is currently monitoring reports of a spike in human metapneumovirus (HMPV) in China, as the US sees an increase in such cases.

Cases of human metapneumovirus, or HMPV, a contagious virus that can lead to respiratory disease, is reportedly spiking in northern China. Infectious disease experts say risk to the U.S. is low.