Theory: The Knox event is contained

Heads up: I know I'm not the first one to say this theory, I just have things to add to the already existing one

I like the idea of the Knox event being contained within the zone. I know military broadcasts talk about the whole world being infected but I think it's just a governmental way of saying: hey y'all, don't try to escape and potentially spread the infection cuz, uhh, the whole world is infected, so there's no point. I also believe, similarly to other people, that the infection is fabricated. You can see the military is HEAVILY involved within all of this, I know in a real life event like this they would be involved too but I feel like something sketchy is going on. In the recent build 42, in the military base basement you can see something I noticed as soon as I saw it. Animal cages. Along with test cells to put humans with boxes and chairs and stuff, maybe to test their cognitive abilities. Now, I think everyone here is familiar with the lab rats, using small mammals to test the effects of infections. There are A LOT of small animal cages in the room SPECIFICALLY DESIGNED FOR THEM, (also one of them is broken so do what you will with that info) wich makes me think that they made this as a biological weapon in a potential future war but it escaped and shit happens. Next: also in the military base basement you see a giant cave with a small camp. I don't think the general population would have access to that military base, much less the cave system, wich makes me think that the research staff took refuge in those caves, hoping to survive the breach. You also see the graffiti text "have hope", wich also makes me think that, even with the government saying the whole world is doomed, you need to have hope because IT'S NOT actually, and the infection is contained. As I said previously, only research staff would have access to this cave and such, they would know what they were talking about when they said for you to have hope that the world isn't doomed.

TDLR: Virus was being fabricated for warfare and a test subject, rat or human, broke containment and started infection spread. The military, to control people from attempting to escape the infection zone, said the world is completely infected.