A new study that compares the structure of influenza B virus hemagglutinin (which infects only humans) with a similar protein on influenza A virus (which infects birds and humans, and has been the source of past global pandemics) may provide insight into how avian flu virus must change to infect humans easily.
http://www.sciencedaily.com/releases/2007/10/071015193432.htm
-Elizabeth
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