How safe is America from polio?

After decades of American children routinely receiving polio vaccines, the virus that had doomed many to paralysis was nearly eliminated in the United States. But vaccine avoidance today may allow the crippling disease to return.

How safe is America from polio?
After decades of American children routinely receiving polio vaccines, the virus that had doomed many to paralysis was nearly eliminated in the United States. But vaccine avoidance today may allow the crippling disease to return.

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