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Canada confines mutant flu to maximum-security facilities

Canada this month announced that any research on mammalian-transmissible strains of the H5N1 avian flu virus in the country’s labs would need to be done at the strictest level of biocontainment, Biological Safety Level 4 (BSL-4). It’s the first country to issue a biosafety rating following the creation of such H5N1 strains in two recent controversial studies (see “Nature News Special: “Mutant Flu”). 

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