The Last of Us
According to this article, the explaination for the "zombie" outbreak in The Last of Us actually has it roots in some very interesting science. The idea is based on this fungus that takes over ant bodies (the host) to make it do its bidding and eventually spread its spores. The cilia grow out of the ants body, similar to terrifying abomination that is whatever is coming out of a clicker's face. The Last of Us' proposal that this fungi, cordyceps, somehow transfer to humans is ACTUALLY PLAUSIBLE.
Dead Rising Series
So the Dead Rising series proposes that these wasp eggs contain parasites that infect humans leading to the zombie outbreak that forces you run through a mall with a chainsaw attached to a boat paddle. But how much do we really know about wasps, and more importantly, how much do we really know about eggs? Wasp Science is woefully underfunded, even more so than egg science, and I've been denied grants to study Wasp Zombies more times than I can count. For all we know, Dead Rising's parasitic wasp eggs are SOMEWHAT PLAUSIBLE.