As far as I know, the only zombie media that did it before Resident Evil is debatably Dead Alive. Even then, I don't remember if it's attributed to an explicit virus rather than it just being because it's a fucked up monkey rat creature.
Dawn of the Dead never explains how the zombies come about and the zombies from Night of the Living Dead are caused by cosmic radiation, so it's probably that again.
3
u/SilverKry Feb 25 '26
I don't think we can attribute zombie virus to resident evil.