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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.
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CIDRAP - Center for Infectious Disease Research and PolicyOffice of the Vice President for Research, University of Minnesota, Minneapolis, MN
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