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![Swine Flu: Learning From Past Pandemics](https://webarchive.library.unt.edu/eot2008/20090509071831im_/http://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/articles/thumbnails_daily_images/2009/May_2009/swine_flu_friday.jpg)
Swine Flu: Learning From Past Pandemics
The last three flu pandemics have features in common with H1N1 swine flu -- and show that pandemics come in waves of differing severity in different places over two or more years.
The last three flu pandemics have features in common with H1N1 swine flu -- and show that pandemics come in waves of differing severity in different places over two or more years.
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