The Explainer How Polio Became a Global Health Crisis

摘要

Two years after being on the brink of eradication, polio has spread to at least 10 countries in Asia, Africa and the Middle East, prompting the World Health Organization to declare a global public-health emergency. In Pakistan, the nexus of the new outbreak, rumors abound that immunization can cause infertility or worse, and local Taliban groups have obstructed anti-polio workers. The number of cases in the country rose 60% last year.