Chinese Disease, even the so-called Delta variant is less contagious than many other diseases, including ones that are transmitted by airborne vectors. We've never required masks for those...
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Your attempts to minimize the virus's R0 is based on old information. The Delta variant is nearly as transmissible as chickenpox and polio.
https://www.cnn.com/2021/07/29/politics/cdc-masks-covid-19-infections/index.html