Laurie Garrett says: "Masks are useless when worn outdoors and may not be very helpful even indoors. Most masks deteriorate after one or two wearings. Using the same mask day after day is worse than uselessâitâs disgusting, as the contents of your mouth and nose eventually coat the inside of the mask with a smelly veneer that is attractive to bacteria. I rarely wear a face mask in an epidemic, and I have been in more than 30 outbreaks. Instead, I stay away from crowds, and I keep my distance from individual peopleâa half meter, about 1.5 feet, is a good standard. If someone is coughing or sneezing, I ask them to put on a maskâto protect me from their potentially contaminated fluids. If they decline, I step a meter (about 3 feet) away from them, or I leave. Donât shake hands or hug peopleâpolitely beg off, saying itâs better for both of you not to come in close contact during an epidemic."