Bacteria and viruses behave differently. It’s possible, even likely, that a measure against one will be ineffective against the other. In an attempt to fights

Bacteria and viruses behave differently. It’s possible, even likely, that a measure against one will be ineffective against the other. In an attempt to fights a specific virus, namely sarscov2 - no, we don’t know that masks work. The cdc numbers I saw talk about 2% reduction in vivo.