title: WHO raises flu pandemic alert to level 5.
authors.forename: Fred
authors.initials: F
authors.lastname: Charatan
mesh_terms: D004196:Disease Outbreaks; D014943:Global Health; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D014944:World Health Organization