How come the water is not infected?

[Dyehardjr]

The paragrah is a bit jumbled but basicly in order for the Virus/Parasite (V/P) to survive out side the body, let alone in salt water will take several years of mutation and will most likely have mutated the ability to infect animals as well.

That's interesting... we know that animals aren't effected from the Virus/Parasite/whatever, but if the Tower was forced to begin hunting animals and having to eat them, which is likely, because Riley has said that they have 2 years before ALL the food goes bad, could the virus be transfered through the animal to humans, even though it doesn't effect the animal?