As threatened, a reset of research selection has occurred. Any nations desperately trying to find a cure for their neighbors will need to revivify their efforts.
Hang in there, everybody! The dead may outnumber the living, and the zombies may outnumber the dead, but time is, well, time isn't on the zombies side!
Update: And now the dead have indeed risen, or at least most of them. Perhaps the good news is that the dead no longer outnumber the living, at least for the time being. And the enormous loss of progress in cure research... good news for the zombies, I suppose?
By the way, it might be good to remind folks that there is a way to ignore all these zombies if you like: Settings -> No Zombies. This doesn't really get rid of the zombies, but it lets you pretend they aren't there, which is close enough.