Nigeria

As part of an anti-corruption crackdown, Nigeria is prosecuting former national security adviser Sambo Dasuki. He allegedly stole billions earmarked for the fight against Boko Haram.

Nigeria is now off the list — the last case was in 2014. That leaves Afghanistan and Pakistan as the last two countries harboring the virus.

Tunde Wey wanted to share the food of his West African childhood. So he crossed the U.S. by bus, hosting pop-up dinners along the way. But Wey, like many immigrants, found success can unravel quickly.