CHICAGO - APRIL 29: (L-R) Chicago Mayor Richard M. Daley, Illinois Governor Pat Quinn, and Damon Arnold, director of the Illinois Department of Public Health, attend a press conference about how the state and city are dealing with the spread of the swine flu April 29, 2009 in Chicago, Illinois. World Health Organization (WHO) Director General Margaret Chan announced an increase to alert level to five today, signaling that they believe a global outbreak of the disease is imminent.