title: The efficacy of face masks.
abstract: Photographs of smoke particles expelled by coughing showed that the filtration type of face mask effectively prevents them from spreading far from the wearer.
mesh_terms: D003371:Cough; D005374:Filtration; D006801:Humans; D008397:Masks; D010781:Photography; D012906:Smoke
chemical_list: D012906:Smoke