I’m assuming that the zombie disease spreads via bites, scratches, or really any injuries caused by zombies.
Edit: Just to be fair to the zombies lets say they can also swim
Zombies wouldn’t even be that bad tbh
In a verse where someone can just walk up to your small island town one day and turn into into a glass crater in one spell, they just aint that threatening
Honestly, between zombies, whatever they walk or run, that bite me and transform me into one of them, and atlanteans, that are able to use magic, FS and weapon skills and what to eat me alive, I choose zombies every time.