"Surgical masks protect other people from your coughing / breathing -- they do nothing for you."
But the mandate to wear masks in crowded public places is to protect others from the wearer. Note there have been few if any reported cases of transmission on long flights from China. This may have something to do with mask wearing by carriers of the disease.
But the mandate to wear masks in crowded public places is to protect others from the wearer. Note there have been few if any reported cases of transmission on long flights from China. This may have something to do with mask wearing by carriers of the disease.