World Health Organisation (WHO) Director General Margaret Chan (C) gestures between U.S. Secretary of Health and Human Services Kathleen Sebelius (L) and her Canadian counterpart Leona Aglukkaq prior to a high-level consultation meeting on Influenza A (H1N1) on the side line of the WHO World health assembly's annual meeting on May 18, 2009 at the UN Offices in Geneva. The WHO's annual assembly opened with the spectre of a global flu pandemic hanging over the gathering following a sharp spike in swine flu infections in Japan.