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High demand, production problems, and lack of raw materials contribute to the shortage, which has hindered immunization campaigns at a crucial time.
WHO Director-General Margaret Chan declared polio's spread this year to be a public health emergency, and she spelled out temporary steps for curbing the threat.
The CDC noted some hope in Afghanistan and Pakistan—but the disease reappeared in Cameroon.
(CIDRAP News) – Polio cases in Africa were almost halved in 2011, but the disease shows worrisome trends in some countries, health officials reported today as the continent geared up to vaccinate 111 million children against the disease.
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