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Bird flu still present in a harmless form

This content was published on Jun 9, 2009 The non-virulent strains are particularly rampant in mute swans, where 80 per cent of the local population has been infected, according to the findings of a study presented on Tuesday at a conference on the bird-flu situation. Over the past three years 554 black swans were tested as a part of the Constance research project,…