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File photo of World Health Organisation Director-General Margaret Chan speaking during the 62nd World Health Assembly at the United Nations European headquarters in Geneva May 18, 2009. The WHO declared June 11, 2009 that the new H1N1 virus has caused the first influenza pandemic in more than 40 years. [Agencies]
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WHO declares A(H1N1) flu pandemic
The World Health Organization has told its member nations it is declaring a A(H1N1) flu pandemic - the first global flu epidemic in 41 years.