How Influenza Pandemics Occur
The National Institute of Allergy and Infectious Diseases explains the emergence and potential spread of new influenza viruses.
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![Experiments with Spanish Influenza, 1918-1919 [The Invisible rainbow]](https://sun9-60.userapi.com/_ct-D0Ftk1rrxqFXFucPswx876byVgILNErlBQ/GVBR_z_9yBw.jpg)
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