SWITZERLAND-HEALTH-FLU-WHO-PANDEMIC-CHAN

-…World Health Organisation (WHO) chief Margaret Chan answers to journalist during a press conference after WHO raised its flu alert to phase five out of six, on April 29, 2009 at the WHO headquarter in Geneva. “I have decided to raise the influenza pandemic alert from phase four to phase five,” the WHO director general announced after an emergency meeting of the UN health agency’s pandemic experts. AFP PHOTO / NICHOLAS RATZENBOECK (Photo credit should read NICHOLAS RATZENBOECK/AFP/Getty Images)