That may not sound surprising, but the common wisdom among flu experts has been that flu was not an airborne virus but only spread by fairly large droplets, from coughing or sneezing.
The new study found clear evidence that influenza patients breathe the virus out through their mouths and noses in tiny particles that can stay suspended in the air for minutes or hours.
It’s useful information in a flu season that has peaked across the continental United States all at once. The Centers for Disease Control and Prevention reported Friday that influenza activity continues on the upswing, with the whole country experiencing the annual influenza epidemic at the same time. So far this season, flu has killed 30 children, the CDC said.