"Disposable medical masks (also known as surgical masks) are loose-fitting devices that were designed to be worn by medical personnel to protect accidental contamination of patient wounds, and to protect the wearer against splashes or sprays of bodily fluids. There is limited evidence for their effectiveness in preventing influenza virus transmission either when worn by the infected person for source control or when worn by uninfected persons to reduce exposure. Our systematic review found NO SIGNIFICANT EFFECT of face masks on transmission of laboratory-confirmed influenza." https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
"On the basis of these preliminary findings, both surgical and N95 masks appear equally effective in preventing influenza dissemination from patients with confirmed influenza. These findings support current guidelines regarding mask use by patients with acute influenza." https://academic.oup.com/cid/article/49/2/275/405108
"Disposable medical masks (also known as surgical masks) are loose-fitting devices that were designed to be worn by medical personnel to protect accidental contamination of patient wounds, and to protect the wearer against splashes or sprays of bodily fluids. There is limited evidence for their effectiveness in preventing influenza virus transmission either when worn by the infected person for source control or when worn by uninfected persons to reduce exposure. Our systematic review found NO SIGNIFICANT EFFECT of face masks on transmission of laboratory-confirmed influenza." https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
CDC pro-mask summary with old studies: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover-guidance.html
"Data do not back cloth masks to limit COVID-19, experts say" https://www.cidrap.umn.edu/news-perspective/2020/04/data-do-not-back-cloth-masks-limit-covid-19-experts-say
Modes of transmission of virus causing COVID-19: implications for IPC precaution recommendations https://www.who.int/news-room/commentaries/detail/modes-of-transmission-of-virus-causing-covid-19-implications-for-ipc-precaution-recommendations
COMMENTARY: Masks-for-all for COVID-19 not based on sound data https://www.cidrap.umn.edu/news-perspective/2020/04/commentary-masks-all-covid-19-not-based-sound-data
Masks Are Neither Effective Nor Safe: A Summary Of The Science https://www.citizensforfreespeech.org/masks_are_neither_effective_nor_safe_a_summary_of_the_science
Cited by the CDC: "Our findings suggest that a homemade mask should only be considered as a last resort to prevent droplet transmission from infected individuals, but it would be better than no protection." https://www.cambridge.org/core/journals/disaster-medicine-and-public-health-preparedness/article/testing-the-efficacy-of-homemade-masks-would-they-protect-in-an-influenza-pandemic/0921A05A69A9419C862FA2F35F819D55
Why masks don’t work — According to Science https://www.citizenfreepress.com/column-3/why-face-masks-dont-work-according-to-science/
Effectiveness of Masks and Respirators Against Respiratory Infections in Healthcare Workers: A Systematic Review and Meta-Analysis https://academic.oup.com/cid/article/65/11/1934/4068747
"On the basis of these preliminary findings, both surgical and N95 masks appear equally effective in preventing influenza dissemination from patients with confirmed influenza. These findings support current guidelines regarding mask use by patients with acute influenza." https://academic.oup.com/cid/article/49/2/275/405108
Universal Masking in Hospitals in the Covid-19 Era https://www.nejm.org/doi/full/10.1056/NEJMp2006372
Bogus study by environmental scientists for masks https://www.ksl.com/article/46778896/byu-research-analysis-shows-masks-still-most-effective-in-fighting-spread-of-covid-19