Virus research triggers fear
Scientists are at odds over tests that some say could be used to make a biological weapon.
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US pleads to keep bird flu studies secret
The US has asked Nature and Science to censor data on a lab-made version of bird flu that could spread more easily to humans.
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WHO declares first 21st century flu pandemic
The World Health Organisation declared an influenza pandemic on Thursday and advised governments to prepare for a long-term battle.
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