The conclusions are as follows:
1.) Wearing masks will not reduce SARS-CoV-2.
2.) N95 masks protect health care workers, but are not recommended for source control transmission.
3.) Surgical masks are better than cloth but not very efficient at preventing emissions from infected patients.
4.) Cloth masks will be ineffective at preventing SARS-CoV-2 transmission, whether worn as source control or as personal protective equipment (PPE).
Masks may confuse that message and give people a false sense of security. If masks had been the solution in Asia (where masks are very commonly used for all respiratory infections), shouldn’t they have stopped the pandemic before it spread elsewhere?
I want to close this posting with a graphic from Swiss Policy Research. The graphs show the cumulative number of COVID-19 infections against time and the date when mandatory masks were introduced with a vertical dashed red line for two German districts:
As you can see, there was very little negative impact on the rise in infections when mandatory mask wearing was introduced.