“Cytokines are from the endogenous (comes from inside the body) and infections are from the exogenous (comes from outside the body).”
I think you did not completely understand what you wrote. it is not cytokines versus infections. The cytokines (TNF-alpha plays a minor role in this process) are usually released in response to an infection of some kind. I think you did not understand that this exogenous refers to exogenous substances that directly trigger release of cytokines (i.e. lps as a major role in gram -sepsis) as opposed to the other more regulated immunological response, which some term endogenous. I guess Wikipedia was unclear. Am I right in presuming that you are not a doctor?