Uh, just looked at map and Pyongyang/North Korea is holding great on stats - zero infections. Does anyone know if it's becase a) almost nobody travels there, or b) there's no outgoing information or both?
So I'd say b) is most likely. People are criticizing China's release of information but compared to NK, they're pretty transparent.
Even if the situation on the ground was disastrous, I'd bet that the government would do everything to hide it.