The Poliovirus
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Images
http://upload.wikimedia.org/wikipedia/commons/8/8a/Polio_sequelle.jpg
http://i2.cdn.turner.com/cnn/dam/assets /140305152904-polio-patient-feet-india-story-top.jpg
http://www.takegreatpictures.com /app/webroot/content/2010_images/2007/06/21/end_of_polio_5.jpg
http://failuretolisten.files.wordpress.com/2013/11/polio.gif