A safety and security manager in a laboratory handles an uninfected blood sample in London
A safety and security manager in a Category 4 laboratory handles an uninfected blood sample used as a control against Influenza A samples at the National Institute of Medical Research in London May 1, 2009. A British health official confirmed on Friday the first case of the Influenza A (H1N1) strain, formerly referred to as swine flu, contracted by a person in Britain who had not been recently to Mexico. REUTERS/Stephen Hird (BRITAIN HEALTH)
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