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

Three years ago, health officials phasied out a problematic component of the polio vaccine used in developing countries, and introduced a version that they hoped would put the world on a better footing to eradicate the disease. Now, some health officials are weighing whether “the switch,” as the process was known, needs to be reversed because they fear the new vaccine heightens the risk of the disease spreading indevelopin nations.

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Helen Branswell
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