Researchers estimate that 1.5 million children die each year from vaccine-preventable illnesses. Access to vaccines in the developing world is limited by cost, supply shortages, a lack of trained health workers, unreliable transportation systems and a lack of refrigerated storage facilities. According to the Gates Foundation, “Nearly 200 countries around the globe have endorsed a shared vision—known as the Decade of Vaccines—to extend the benefits of vaccines to every person by 2020 and thereby save more than 20 million lives.” This vision includes the eradication of polio, which remains endemic to Afghanistan, Pakistan, and Nigeria.

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