Public health officials, including the CDC and WHO, do not recommend that people without symptoms wear a mask.
Guidance from the World Health Organization
Wearing a medical mask can help limit the spread of some respiratory disease. However, using a mask alone is not guaranteed to stop infections and should be combined with other prevention measures including hand and respiratory hygiene and avoiding close contact – at least three feet distance between yourself and other people.
WHO advises on rational use of medical masks thus avoiding unnecessary wastage of precious resources and potential mis-use of masks. This means using masks only if you have respiratory symptoms (coughing or sneezing), have suspected COVID-19 infection with mild symptoms or are caring for someone with suspected COVID-19 infection. A suspected COVID-19 infection is linked to travel in an area in China where COVID-19has been reported, or close contact with someone who has traveled from China and has respiratory symptoms.