Medical masks versus N95 respirators for preventing Covid-19 among health care workers (29 November 2022)

Summary

Questions have been raised as to whether medical masks offer similar protection against Covid-19 compared with N95 respirators. This study in The Annals of Internal Medicine aimed to determine whether medical masks are noninferior to N95 respirators in preventing Covid-19 in healthcare workers providing routine care. The authors of the study conducted a multicentre, randomised, noninferiority trial at 29 healthcare facilities in Canada, Israel, Pakistan and Egypt. The study found that among healthcare workers who provided routine care to patients with Covid-19, the overall estimates rule out a doubling in hazard of PCR–confirmed Covid-19 for medical masks when compared with N95 respirators.