Recent studies suggest that coronavirus disease 2019 (COVID-19) may be transmitted by infected persons even in the absence of symptoms of disease. While social distancing and good hand hygiene are the most important methods to prevent virus transmission, new guidelines state that healthy individuals can consider wearing masks in public settings, particularly when physical distancing is difficult (like in grocery stores or pharmacies). Primary benefits of wearing a mask include limiting the spread of the virus from someone who knows or does not know they have an infection to others. Masks also remind others to continue practicing physical distancing. However, nonmedical masks may not be effective in preventing infection for the person wearing them. Masks should not be worn by children younger than 2 years or by individuals who are unable to remove the mask by themselves or are unconscious.