US Health and Human Services Secretary Kathleen Sebelius, left, speaks as she sits next to China's Margaret Chan, Director General of the World Health Organization (WHO), and Mexican Health Minister Jose Angel Cordova Villalobos during a high-level consultation during the first day of the 62nd World Health Assembly, WHA, at the European headquarters of the United Nations, UN, in Geneva, Switzerland, Monday, May 18, 2009. Swine flu and the possibility of a vaccine topped the agenda Monday as the World Health Organization opened its annual meeting amid concern that the virus continues to spread and kill around the globe.