Parade Magazine: Ask Marilyn:
Does Wearing a Mask Protect the Wearer?: We repeatedly hear how masks prevent the wearer from transmitting COVID-19 to others but do not protect the wearer. Can you explain?—John Smith, Lake Wales, Florida
This is a rampant misunderstanding. Masks (except those with exhalation valves) do work both ways. Yet masks worn by sick people are far more effective at preventing the spread [...]
