Bird flu may mutate to kill more than 50% of humans who catch it, as a result of ‘unprecedented’ outbreak sweeping mammals, experts fear
Cases of killer H5N1 strain have already jumped from birds to foxes and mink
It has sparked concern that pathogen is one step closer to spreading in humans
Experts warn a new variant could arise that is ‘more harmful’ to humans
www.dailymail.co.uk/health/article-11748537/Bird-flu-mutate-kill-50-humans.html
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