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Healthcare and aged care settings amplify outbreaks, so protection of patients and staff is paramount. Most guidelines assume risk is only present during close contact or aerosol generating procedures, but studies show intermittent use of respirators is not protective. New research in aerosol science confirms the risk of infection is widespread in health facilities. In community settings, any mask use is protective during epidemics, especially if used early, when combined with hand hygiene, and if wearers are compliant. Community use of N95 respirators is more protective than surgical masks, which are more protective than cloth masks, but even cloth masks provide some protection. Mask guidelines should be adaptable to the specific context and should account for rising epidemic activity, and whether a pathogen has asymptomatic transmission. The main rationale for universal masking during pandemics is asymptomatic transmission, which means risk of transmission cannot be self-identified. The precautionary principle should be applied during serious emerging infections or pandemics when transmission mode is not fully understood, or vaccines and drugs are not available. If respirators are not available, medical or cloth masks could be used as a last resort. Data exist to support extended use and reuse of masks and respirators during short supply. In summary, extensive evidence generated during the covid-19 pandemic confirms the superiority of respirators and supports the use of masks and respirators in the community during periods of high epidemic activity. Some gaps in research remain, including economic analyses, research in special population groups for whom masking is challenging, and research on countering disinformation.\n<jats:bold\/>\n<\/jats:p>","DOI":"10.1136\/bmj-2023-078573","type":"journal-article","created":{"date-parts":[[2025,2,28]],"date-time":"2025-02-28T09:52:38Z","timestamp":1740736358000},"page":"e078573","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["The role of masks and respirators in preventing respiratory infections in healthcare and community settings"],"prefix":"10.1136","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3060-0555","authenticated-orcid":false,"given":"C Raina","family":"MacIntyre","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4203-7891","authenticated-orcid":false,"given":"Abrar A","family":"Chughtai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5779-7979","authenticated-orcid":false,"given":"Mohana","family":"Kunasekaran","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8147-079X","authenticated-orcid":false,"given":"Essa","family":"Tawfiq","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2369-8088","authenticated-orcid":false,"given":"Trish","family":"Greenhalgh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2025,2,27]]},"reference":[{"key":"2025022709350688000_388.feb27_7.e078573.1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijnurstu.2020.103567"},{"key":"2025022709350688000_388.feb27_7.e078573.2","unstructured":"World Health Organization (WHO). 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