As of this week, 11 cases of human metapneumovirus ( hMPV ) have been reported in India, raising concerns about its potential to spread. First identified in China, hMPV causes respiratory symptoms ... HMPV is a respiratory virus that can cause mild to severe infections, especially in young children and older adults. Learn about its symptoms , transmission, diagnosis, treatment, and prevention tips from Apollo Hospitals. Symptoms of HMPV virus These HMPV symptoms typically appear 3 to 6 days after exposure and can last from a few days to a week. In severe cases, especially among high-risk groups, symptoms may progress to bronchitis or pneumonia. The Human Metapneumovirus ( HMPV ) is known to cause illnesses ranging from mild respiratory discomfort to severe complications, especially in vulnerable populations such as infants, older adults, and individuals with weakened immune systems. It reportedly tends to peak during late winter and early spring in temperate regions, although it circulates year-round in some areas.