- Paranoia Fuel: Under the Skin has this in spades. Not only because the zombies in this scenario are caused by nigh-unkillable parasites that range in size from single-celled microorganisms to towering abominations the size of small buildings, and can infest humans during any of these stages, with the infestation usually not being apparent at first, but also because of the implied Government Conspiracy.
- Similarly, Nanopocalypse. Being more than microscopic in size, the nanomachines can get in pretty much anywhere, no matter how tightly sealed, and it only takes one nanobot to infest and replicate in something, or someone.
YMMV / The End of the World