@dave_m_ The risk level of the person wearing the mask doesn't matter very much. The purpose of mask mandates and widespread masking generally to reduce the intensity of transmission. Whether at high or low risk personally, people can still spread.
@戴夫：戴口罩的人的风险水平并不重要。口罩的目的通常是为了降低传播的强度。无论个人风险是高风险还是低风险，人们仍然可以传播。