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phooph
12-10-2009, 10:38 AM
Polio vaccine blamed for outbreaks in Nigeria
Mutation of live virus in oral doses linked to 124 cases this year, experts say
The Associated Press
updated 10:24 a.m. MT, Fri., Aug 14, 2009
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LONDON - Polio is spreading in Nigeria and health officials say in some cases it's caused by the vaccine used to fight the paralyzing disease.
A virologist with the U.S. Centers for Disease Control and Prevention says genetic analysis proves such mutated viruses have caused at least seven separate outbreaks in Nigeria.
The vaccine used in the United States and other Western nations is given in shots, which use a killed virus that cannot cause polio.
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