Smallpox vaccine, the first successful vaccine to be developed, was introduced by Edward Jenner in 1798. He followed up his observation that milkmaids who had previously caught cowpox did not later catch smallpox by showing that inoculated cowpox protected against inoculated smallpox.
Read more here: https://en.wikipedia.org/wiki/Smallpox_vaccine
Watch similar videos here: http://www.dailymotion.com/playlist/x42kaw_wikivideos_medicine
See more from Wiki Videos: https://www.youtube.com/channel/UC9pZsh1JbkZDC1LiwOHjwuQ/feed
Follow us on Facebook : https://www.facebook.com/WikiVideoProductions
Follow us on Twitter : https://twitter.com/VideosWiki
Our Website : www.wvprod.com
This video is the sole and exclusive property of WV Production Limited.
