Boxes of antiviral drug Tamiflu are stacked in a warehouse in Britain
Boxes of the antiviral drug Tamiflu are stacked in a warehouse in Britain April 29, 2009. Mexican President Felipe Calderon told his people to stay home from May 1, 2009 for a five-day partial shutdown of the economy, after the World Health Organisation said a swine flu pandemic was imminent. REUTERS/Katie Collins/Pool (BRITAIN DISASTER SOCIETY HEALTH)
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