A study in 2014 conducted by none other than the NIH, found that cloth mask penetration was 97%, and that moisture retention and reuse of cloth masks can actually increase the risk of infection!!!
Source: https://pubmed.ncbi.nlm.nih.gov/25903751/
#mask #study #nih
Source: https://pubmed.ncbi.nlm.nih.gov/25903751/
#mask #study #nih