evidence: A comprehensive new review published in Clinical Microbiology Reviews provides strong evidence that masks and respirators are effective in reducing the transmission of respiratory infections like COVID-19. The review, conducted by an international team of 13 researchers, analysed over 400 studies from multiple disciplines, including epidemiology, public health, engineering, and social sciences. 'Our review confirms that masks work, with a clear dose-response effect,' said lead author Professor Trisha Greenhalgh from the Nuffield Department of Primary Care Health Sciences, University of Oxford. 'The more consistently and correctly you wear a mask, the better protected you are. Respirators, when worn continuously, provide even greater protection than ordinary masks.' Masks, including cloth face coverings and disposable medical masks, help reduce the spread of respiratory droplets and aerosols. Respirators, such as N95 and FFP2 devices, are designed to filter out smaller airborne particles and fit more tightly to the face, providing a higher level of protection.