Macintyre (2009): Parents wearing masks reduced the risk of contracting influenza from their sick children by 74% (95% CI: 33%-91%). https://www.ncbi.nlm.nih.go

Macintyre (2009): Parents wearing masks reduced the risk of contracting influenza from their sick children by 74% (95% CI: 33%-91%). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2662657/pdf/08-1167_finalRCME.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2662657/pdf/08-... Jefferson 2008: Wearing masks reduced the risk of contracting SARS by 68% (95% CI: 60%-75%). Wearing N95 masks reduced the risk by 91% (70%-97%). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190272/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190272/ MacIntyre (2015): Use of cloth masks instead of surgical masks increased the risk of infection by 13x (95% CI: 1.69x to 100x). Cloth masks filtered out only 3% of particles, versus 56% for surgical masks. https://bmjopen.bmj.com/content/5/4/e006577.short https://bmjopen.bmj.com/content/5/4/e006577.short Overall, these findings are suggestive that the infection protection factors are broadly similar to the total filtration efficiencies.