Winning the lottery.
Freeman
Paul B
PB
D006801:Humans; D006920:Hygiene; D017757:Infectious Disease Transmission, Professional-to-Patient / Q000517:prevention & control*; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission*