I caught a little bit of the Disney film Zombies while visiting some nieces, which looks like a delightful campy kinda film, so I'm not expecting a thorough treatise on zombie population dynamics.
But the Wikipedia article gave more details than I expected on how the zombies in the film came about, and it piqued my interest.
Fifty years ago in the planned community of Seabrook, an accident at the Seabrook Power Plant resulted in an explosion that caused half the population of Seabrook to turn into brain-eating zombies. Those that weren't affected constructed a wall to quarantine the zombies from the rest of Seabrook in a territory called Zombietown. The government later created bracelets for zombies, called Z-Bands, that deliver soothing electromagnetic pulses to keep zombies from craving brains. In the present day, zombie students from Zombietown transfer to the human high school, Seabrook High, where suburban life is filled with uniformity, traditions, and pep rallies. The zombies in the school are patrolled by Dale, whose daughter Addison and nephew Bucky are on the school's cheerleading team.
Part of what I caught showed two cheerleaders being dropped off in 'Zombietown' to throw eggs at Zombie's houses, but there are kids and grown-ups, actual houses and communities there.
I'd have imagined that unless more people were turned into zombies their population would have dwindled by now so either:
- Zombies are immortal and unaging (the film didn't seem to imply this)
- Children are born zombies, and fitted with new z-bands at birth (not covered the film, but I wouldn't expect that)
- Exposure to the aftermath of the powerplants explosion converts people into zombies (Which makes most sense, but doesn't explain why people can visit zombie town and be unaffected, nor why people keep going there and letting themselves be converted.
Or some other more typical zombie process (biting, saliva in wounds etc...), the sort of thing genre savvy people might be expected to assume?
Do any of the three films explain this at all, or is it glossed over?