The pandemic 2009 (H1N1) swine influenza virus is mild compared to the pandemic 1918 (H1N1) virus because of a proline-to-serine substitution in the receptor-binding site of its hemagglutinin – A hypothesis
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PII: S0306-9877(09)00639-2
doi:10.1016/j.mehy.2009.09.034
© 2009 Elsevier Ltd. All rights reserved.
