Copenhagen experts recruited 6,000 volunteers in the spring — before masks were mandatory there — and split the them into two groups, with half wearing masks in public and half not.
After a month, the mask-wearing volunteers were tested for current and previous Covid-19 infection and compared with the control group who didn’t wear them.
Results showed that, after one month, 1.8 per cent of the people wearing masks had been infected with the virus.
By comparison, 2.1 per cent of the people in the unmasked group had tested positive for Covid-19. The difference between the two groups was not found to be statistically significant
