Dr. Julie Hall, right, WHO expert on Emerging Infectious Diseases, and Dr. Soe Nyunt-U, WHO representative to the Philippines, talk to reporters during a briefing on the H1N1 virus, also know as swine flu, at the WHO Regional Headquarters in Manila, Philippines, Friday, May 22, 2009. The World Health Organization says 41 countries have reported more than 11,000 cases, mostly in the U.S. and Mexico, including at least 86 known deaths.