A key defence that blocks nearly all bird flu when it attempts to invade our body has been discovered by scientists.
Bird flus have been involved in four pandemics since 1918 - killing millions of people.
The research, led by the University of Glasgow, showed those pandemics and normal winter flus had evolved ways of getting round this "powerful barrier".
The team think we will soon be able to predict which of the flus currently in birds pose the biggest risk.
Source: www.bbc.com
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