The Zombie Apocalypse

[TheGoldenGriffin]

The digestion parts easy. There are already parasites (like tapeworm) whose eggs can survive our stomach. Thats why filtered water is important in certain places in Africa, where the Guinea worm lives

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A zombielike disease doesn't have to deteriorate the body, it could be a bacteria that affects the mouth thats hardy enough to survive regular toothbrushing and mouthwashing. It will remain passive for years like HIV before it releases hormones that will get swallowed with the saliva and enter the bloodstream through the intestines, making the host violent and aggressive, biting and spitting on people and spreading the disease.

Places like America probably wouldn't get affected much because behavior like that would get you arrested and quarentined so it wouldn't spread easily.