Officials say drug caused Nigeria polio
LONDON - A polio outbreak in Nigeria was caused by the vaccine designed to stop it, international health officials say, leaving at least 69 children paralyzed.
It is a frightening paradox in a part of the world that already distrusts western vaccines, making it even tougher to stamp out age-old diseases.
The outbreak was caused by the live polio virus that is used in vaccines given orally — the preferred method in developing countries because it is cheaper and doesn't require medical training to dispense....
Experts say such outbreaks only happen when too few children are vaccinated. In northern Nigeria, only about 39 percent of children are fully protected against polio.
The oral polio vaccine contains a weakened version of polio virus. Children who have been vaccinated excrete the virus, and in unsanitary conditions it can end up in the water supply, spreading to unvaccinated children.
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