
One of the world’s leading medical journals has retracted a widely circulated paper published in April that concluded that “both surgical and cotton masks seem to be ineffective in preventing the dissemination of SARS–CoV-2 from the coughs of patients with COVID-19 to the environment and external mask surface.”
The study, published by the Annals of Internal Medicine, has been cited by dozens of news stories, nearly 10,000 Twitter users — some of whom raised red flags about its methods — and by the World Health Organization.
But it turns out that the authors failed to consider the limits of the test they were using to detect the presence of coronavirus.
The paper only involved four participants. Apparently, the authors thought a correction — adding more patients — would be enough:
Continue reading Top journal retracts study claiming masks ineffective in preventing COVID-19 spread