Just had a quick read through, here's a couple things I noticed;
You've got a few sentences which are redundant, like the following;-
All knowledge of SCP-4000's contents within its pages are the primary cause of infection.
All knowledge of SCP-4000's contents within its pages are the primary cause of infection.
And this;-
Uninfected subjects are capable of being afflicted with SCP-4000's effect by listening to their pleas and cries for help, or to listen to their dire situation.
It's a bit clunky to read in it's current form, and I think it'd be improved if you wrote something like;-
"SCP-4000's effect can be transferred to other individuals via an auditory memetic component - Hearing a test subjects vocalisations of distress will induce the same feelings of panic and distress in the subject."
Still not the best, but I think it's a slightly more scientific tone than what you've got, and it removes the redundancy at the end of the sentence. I'd suggest maybe calling people affected by SCP-4000 SCP-4000-1 or -alpha, something like that. Makes it easier if you need to later write about affected individuals or anything.
One other thing I noticed, in the additional documents at the bottom of the page you've put height & weight as feet and pounds. The Foundation uses the metric system, so i'd suggest changing this.
Good luck in the contest!
“He who shall be last shall be sideways…
…and smiling”
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