The document discusses swine flu, which has infected at least 257 people across 11 countries according to the WHO. The WHO has raised its pandemic alert level to 5 as it believes the first flu pandemic since 1968 may soon be declared. Hundreds more cases are suspected as health officials check for infections and prepare measures to prevent the virus's spread. The document then goes on to answer several questions about swine flu symptoms, transmission, treatment, vaccination, and protective measures.