Geneva - World Health Organization Director General Margaret Chan raised the pandemic alert for swine flu by one level to phase 5 Wednesday night in Geneva.
The declaration of Phase 5 is a strong signal that a pandemic is imminent. It is characterized by human-to-human spread of the virus into at least two countries in one WHO region.
"Based on an assessment of all available information and following several expert consultations, I have decided to raise the influenza pandemic alert from phase 4 to phase 5,," Chan announced at WHO headquarters.