Maybe it was really a quadruple-demic. A little known and underappreciated virus called human metapneumovirus spiked in the US this spring just after RSV, influenza and Covid-19 died down.

The avian flu virus isolated from a hospitalized teenager in Vancouver has mutations in key areas that could help the virus spread more easily in humans, scientists say. CNN values your feedback 1.

Maybe it was really a quadruple-demic. A little known and underappreciated virus called human metapneumovirus spiked in the US this spring just after RSV, influenza and Covid-19 died down.