These undiagnosed infections could be a major factor in the rapid transmission of the omicron variant, the researchers said.

We've heard for months that chances of catching SARS-CoV-2 outdoors are far less than indoors. Is that still true with highly contagious omicron strains? And if it is, what can you do to stay safe?

"Ventilation is the way forward," says infectious disease doctor Abraar Karan of Stanford. Here's how to get better air flow at home, in schools and offices — even in gyms — to stave off COVID.

"Ventilation is the way forward," says infectious disease doctor Abraar Karan of Stanford. Here's how to get better air flow at home, in schools and offices — even in gyms — to stave off COVID.