New Vaccine Joins Campaign to End Polio.
There are three types of polio virus.
Polio is highly infectious.
One victim in two hundred suffers permanent paralysis, usually in the legs.
Five to ten percent of those victims die when their breathing muscles fail.
http://www.voanews.com/specialenglish/2010-01-17-voa3.cfm
impression
I recovered from a disease by vaccine, but vaccine heard few things in the poor countries of Afghanistan or the Middle East and thought that I was sad very in the world.
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