WHO raises level of alert on flu pandemic.
O'Dowd
Adrian
A
D003140:Communicable Disease Control; D004196:Disease Outbreaks; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000401:mortality* / Q000517:prevention & control; D014944:World Health Organization