The advice (CDC/WHO) usually did include a statement that someone who was sick should wear a mask.
Of course it doesn’t make sense to tell people not to buy a box of masks if they aren’t sick because then how do you get a mask when you wake up coughing without going into the pharmacy and spreading it? And all the while through February and March evidence was growing that people might be infectious for a week or more before they got a cough.
Of course it doesn’t make sense to tell people not to buy a box of masks if they aren’t sick because then how do you get a mask when you wake up coughing without going into the pharmacy and spreading it? And all the while through February and March evidence was growing that people might be infectious for a week or more before they got a cough.