A deadly virus that few people even know exists is causing misery across intensive care units and pediatric hospitals, doctors warn. High rates of Covid, flu and even RSV during winter led to hospitals overflowing during winter during a situation dubbed a 'tripledemic'. But cases of human metapneumovirus (HMPV), which can cause bronchitis and pneumonia, shot up to record levels in spring, according to the Centers for Disease Control and Prevention’s respiratory virus surveillance systems. It may partly explain why so many people tested negative for flu and Covid in recent months despite showing symptoms. Dr John Williams, a pediatrician...