Canada’s top doctor was asked how long mandated mask use on domestic or international air travel will be scrapped, as it has in the U.S. Chief public health officer Dr. Theresa Tam says keeping the mandate requires ongoing evaluation, noting with the Omicron variant still going strong, it’s prudent to continue the requirement. Dr. Tam also says when it comes to vaccinations, there are gaps in coverage for COVID-19 and other diseases.