I would guess that whatever the infectious agent is, it does not survive outside of the host organism very long but is passed only by direct contact. The survivors have been in close contact on so many occasions but only infected by direct injury.
If it were otherwise, say airborne or even long-living on exposed surfaces or fluids, then everyone would have turned by now. They live in a filthy, bloody & dead environment. Just cleaning up after an attack would have infected the cleanup crew. I seem to recall the extent of their personal protective gear being gloves and shower curtains at one point. From a biological defense point of view that is laughable, yet none were infected.
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.
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.
~Ra1th: Nik doesn't sleep, he waits.~
~TCM Revolver: ra1th needs to be on the look out for cars that appear to be moved recently, and nikvoodoo on the rooftops
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decent point but thats partially due to pollution right? or no, if it is then it could totally rain more cuz of less pollution.
The word 'almost' is the longest in the English language with all the letters in alphabetical order, other than Aegilops but no ones knows what the hell that means, so it doesn't count.
acid rain doesnt really have anything to do with the zombies, i think you guys are overthinking this issue.
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