An unvaccinated young adult from New York recently contracted polio, the first US case in nearly a decade, health officials said Thursday.
More than 150 countries have begun switching to a different polio vaccine - an important milestone towards polio eradication, health campaigners say.
An unvaccinated young adult from New York recently contracted polio, the first US case in nearly a decade, health officials said Thursday.
More than 150 countries have begun switching to a different polio vaccine - an important milestone towards polio eradication, health campaigners say.