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

While cases are climbing in China, the situation is very different from what it was when Covid-19 emerged five years ago, medical experts say. HMPV is common and decades old.

Five years on from the first news of COVID, recent reports of an obscure respiratory virus in China may understandably raise concerns. Chinese authorities first issued warnings about human metapneumovirus (hMPV) in 2023, but media reports indicate cases may be increasing again during China’s winter season.