Masks might limit spread of swine flu.
D018562:Disease Transmission, Infectious / Q000517:prevention & control*; D006235:Hand Disinfection; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission; D008397:Masks; D012134:Respiratory Protective Devices