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Published May 19, 2009, 12:00 AM

World Health Assembly

China's Margaret Chan, left, Director General of the World Health Organization shake hands with Ban Ki-moon, right, Secretary-General of the United Nations during the 62nd World Health Assembly, WHA, at the World Health Organization (WHO) headquarters, in Geneva, Switzerland, Tuesday, May 19, 2009. U.N. Secretary-General Ban Ki-moon and the global body's top health official Margaret Chan are scheduled to meet with major pharmaceutical companies to discuss making a vaccine for the new swine flu virus. (AP Photo/Keystone/Laurent Gillieron)
Read the article: WHO: Making swine flu vaccine harder than thought