COVID: do they work? maybe not in Denmark
A recent Danish study questions the utility of wearing surgical masks in preventing SARS-CoV-2 transmission rate (see https://www.acpjournals.org/doi/10.7326/M20-6817 ) Details: -- 3030 people, randomly assigned to a recommendation to wear masks, were given a supply of 50 surgical masks (3-layer, disposable surgical mask with ear loops) and instructions for proper use. 2994 were assigned to be controls, in April and May -- these facemasks were high quality surgical mask with filtration rate of 98% -- all were at least 18 years old and reported being outside the home for at least 3 hours a day and did not wear masks during their daily work -- mean age 47, 64% female, 20% smokers, 40% wore eyeglasses daily -- occupation: shop employee 4%, cashier 4%, craftsperson 4%, office employee 12%, manager 5%, transportation employee 25%, service employee 4%, homecare/nursing home employee 9%, early childhood care staff 4%, ...