Is simple breathing enough to spread coronavirus? Some experts now say yes

For weeks, the World Health Organization and the U.S. Centers for Disease Control said coronavirus spreads mainly through droplets expelled when sick people cough and sneeze.
The risk of catching COVID-19 from someone with no symptoms at all, they said, was very low. Officials downplayed the need for widescale protective gear for all health care workers and dismissed the use of face masks for the general public as potentially dangerous.
Now — as California’s governor encourages peopl