Enlarge / A Pakistani health worker administers polio vaccine drops to a child during a vaccination campaign in Karachi on December 10, 2018. Pakistan is one of only two countries in the world where polio remains endemic. (credit: Getty | RIZWAN TABASSUM )

The United States, one of the world’s richest and most developed countries, has met the World Health organization’s criteria to be listed as a country with circulating vaccine-derived poliovirus, the US Centers for Disease Control and Prevention announced Tuesday.
The US now joins the ranks of around 30 other polio outbreak countries, largely low- and middle-income, including Ethiopia, Mozambique, Somalia, and Yemen. Notably, the list includes just two other high-income countries—the United Kingdom and Israel—which have detected the circulation of a poliovirus strain genetically linked to the one spreading in the US.
Specifically, the US met the criteria for WHO’s list by documenting a patient with vaccine-derived

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