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Health officials have long known that virus from the oral vaccine can contaminate water supplies; they underestimated how big a problem this would be.
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The World Health Organization is celebrating the eradication of another strain of the polio virus. Yet major challenges remain in the global effort to get rid of the disease.
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A Norwalk teen who got vaccinated against his mother's wishes testified Tuesday before a U.S. Senate committee examining preventable disease outbreaks.…