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We wanted to know why the virus hasn't been able to jump from human to human easily," professor Wendy Barclay, co-author of the study from the Division of Investigative Science at Imperial College London, said. Alert level four means the virus is showing an ability to pass from human to human and is able to cause community-level outbreaks. _ Flu pandemics occur when a strain of the flu virus mutates into a new form that can spread from human to human and to which people have no natural immunity. |
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