User blog comment:Krishna d/The Dawn of the Infection/@comment-852647-20091121014810

I feel L4D and L4D2 has an amazing story to be discovered behind the game. The way it all connects, with the comments, the writing on the walls, and all that.

If I had to guess, it's either some sort of virus that appeared incredibly fast and spread like wildfire. Obviously some people are immune to it whether they know it or not. I suppose Bio engineering is also a possibility, but I suppose such experiments would be done by a military organization, no ? Thus I would expect to see zombies with machine guns, and maybe some professional clothes. Not to mention the organization would try and prevent the spreading of the infected, but in the game, they just appear to be almost none-existent.

The whole L4D2 environment just looks like they were all trying to treat this infection, and everyone was just wiped/infected by it.

. . . I really hope this all came out okay, I basically just wrote whatever was in my mind. :D