How come the water is not infected?

[Ra1th]

There is no evidence (yet) that says how long the pathogen (to allow for more possibilities than the word virus grants us). Tommy got the Jumpers guts sprayed all over him and about five minutes later it gets into his wounds and he turns. For all we know, the pathogen can live outside a host body for years until evidence is produced to the contrary.

The scene at the Arena with humans hiding in a pile of mutilated corpses tends to prove this as well. There is no way that in that vile & juicy pile of creature-killed corpses that they did not come across blood or saliva from a creature - they were covered in goo. Yet no infection.

i think ur forgetting about this. angel and riley came into contact with zombie blood/saliva in the corpse hill, and they didnt turn, so the pathogen will die out in a few days without its host, or so the logic goes, OR ITS A PLOT HOLE!