'The switch’ was supposed to help eradicate polio. Now it’s a quandary

'The switch’ was supposed to help eradicate polio. Now it’s a quandary

‘The switch’ was supposed to be a major step toward eradicating polio. Now it’s a quandary

By HELEN BRANSWELL

YASUYOSHI CHIBA/AFP/GETTY IMAGES

The phasing out a problematic component of the polio vaccine used in the developing world has created major issues for the effort to eradicate the disease.

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