AP: WHO raises pandemic flu alert level to phase 4

MEXICO CITY (AP) — Mexico says the World Health Organization has raised its pandemic alert for swine flu by one level, two steps short of declaring a full-blown pandemic

Mexico health department spokesman Carlos Olmos confirms the move.

WHO says the phase 4 alert means sustained human to human transmission causing outbreaks in at least one country. It signals a significant increase in the risk of a global epidemic, but doesn't mean a pandemic is inevitable.

Associated Press: WHO raises pandemic flu alert level to phase 4