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

Professor Paul Hunter from the University of East Anglia notes that almost every child contracts HMPV by five years of age, with reinfections occurring throughout life. “HMPV typically causes cold-like symptoms that recover by themselves within 2 to 5 days. Severe cases are rare but can occur in vulnerable groups,” he says.

China’s winter illness season is less severe compared to the year before, according to data from its health authority. But the proliferation of a long-standing though little-known pathogen called human metapneumovirus (hMPV) has been raising alarm both at home and in other countries.

The Centers for Disease Control and Prevention says there is a reported spike in human metapneumovirus (HMPV) in China, and they are monitoring it closely.

HMPV is a respiratory disease that causes flu or cold-like symptoms. However, it can increase risks or lead to more serious complications like bronchitis or pneumonia, particularl