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Published online 5 May 2009 | Nature | doi:10.1038/459014a
How severe will the flu outbreak be?
Epidemiologists race to pin numbers on the global H1N1 spread.
The World Health Organization (WHO) this week remained on the verge of declaring a pandemic of the H1N1 swine-associated flu virus. Public-health bodies and scientists have made progress in starting to understand the outbreak, but major questions remain about how severe the disease will get.
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