A reminder to resist mask mandates.

Requirements to wear surgical masks in a large London hospital during the first 10 months of Omicron activity (December 2021 to September 2022) made no discernible difference to reducing hospital-acquired SARS-CoV-2 infections, according to new research being presented at this year’s European Congress of Clinical Microbiology & Infectious Diseases (ECCMID) in Copenhagen, Denmark (15-18 April).