various studies that show mask-wearing is effective in decreasing the spread of COVID-19.“Many physicians look at this and say: ‘We cannot understand why masks are not mandatory,'” said Sawyer.Sawyer’s sentiments are echoed in an open letter to Alberta Health officials penned by members of the medical science community.[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]The letter, signed by more than 30 members as of Monday, reads in part:“Having reviewed the literature, which is supported by the latest WHO guidance, we wanted to offer our thoughts on the issue.“We are respectfully requesting that strong consideration be given to the recommendation of mandatory mask policies to help protect more Canadians.” The group.