I've thought about this too. As far as we know there isn't one. They were working on it at the France location but last we heard they thought they were close. You know how medicine is though. When they say they are close that could mean another 20+ years. 😳
About this, i thought he said France try but they didnt make it. But also i think somewhere in earth, some CDC centers trying to found cure. This maybe Wales,England,Germany or somewhere. All world cant be overruned by walkers. Some places should protecting by military or civilians.