Here’s a cut and paste from her control research study on the contamination of cloth facemasks in a clinical setting in Vietnam from 2015.<br><br><div id="sec-7" class="subsection" style="font-size: 16px; -webkit-font-smoothing: antialiased; box-sizing: border-box; caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); font-family: interfaceregular, HelveticaNeue, "Helvetica Neue", Helvetica, Arial, sans-serif; -webkit-text-size-adjust: 100%;"><p id="p-8" style="-webkit-font-smoothing: antialiased; box-sizing: border-box; margin-right: auto; margin-bottom: 10px; margin-left: auto; line-height: 2.5rem;"><strong style="-webkit-font-smoothing: antialiased; box-sizing: border-box;">Results</strong> Viral contamination with rhinovirus was identified on both used medical and cloth masks. Most HCW (77% of daily washing) self-washed their masks by hand. The risk of infection was more than double among HCW self-washing their masks compared with the hospital laundry (HR 2.04 (95% CI 1.03 to 4.00); p=0.04). There was no significant difference in infection between HCW who wore cloth masks washed in the hospital laundry compared with medical masks (p=0.5).</p></div><div id="sec-8" class="subsection" style="font-size: 16px; -webkit-font-smoothing: antialiased; box-sizing: border-box; caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); font-family: interfaceregular, HelveticaNeue, "Helvetica Neue", Helvetica, Arial, sans-serif; -webkit-text-size-adjust: 100%;"><p id="p-9" style="-webkit-font-smoothing: antialiased; box-sizing: border-box; margin-right: auto; margin-bottom: 10px; margin-left: auto; line-height: 2.5rem;"><strong style="-webkit-font-smoothing: antialiased; box-sizing: border-box;">Conclusions</strong> Using self-reported method of washing, we showed double the risk of infection with seasonal respiratory viruses if masks were self-washed by hand by HCWs. The majority of HCWs in the study reported hand-washing their mask themselves. This could explain the poor performance of two layered cloth masks, if the self-washing was inadequate. Cloth masks washed in the hospital laundry were as protective as medical masks. Both cloth and medical masks were contaminated, but only cloth masks were reused in the study, reiterating the importance of daily washing of reusable cloth masks using proper method. A well-washed cloth mask can be as protective as a medical mask.</p></div><br>