Single-cloth masks not effective against Omicron, head of Ontario science table says

We know face masks protect against COVID-19, but how well does your face mask protect against the Omicron variant? One top doctor says if you’re using a certain type, your level of protection could be minimal to none. Kayla McLean has the story.

• What masks work best against Omicron? Experts are divided, but most say ditch cloth masks
• Single-layer cloth masks not effective against Omicron, says Ontario science advisory table director