Just a year after the World Health Organization (WHO) declared Nigeria polio-free, several new cases of the disease cropped up in the African nation, and officials are shifting their focus to ensure that more cases don’t appear. All three cases were confirmed in areas of the Borno state liberated from Boko Haram, an Islamic militant group. Dr. Chima Ohuabunwo, an epidemiologist who has been working with the U.S. Centers for Disease Control and Prevention in Nigeria, says that parts of Borno were cut off from the rest of the world by the militant group, leaving locals with little to no access to healthcare.

For the full article, visit NPR.org.