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This study of hospital-contracted influenza and RSV (using Brigham and Woman's Hospital as the data source) found that rates were cut in *half* thanks to universal masking during the worst of Covid.

We identified a cheap, easy way to significantly reduce disease and death and then decided..."nah.” https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciad451/7235905?login=false