mononucleosis

[Voltron87]

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You should do some reading up on mono. I had it in high school and it sucked ass. However IIRC, there is some debate about how contagious it is, and how it is transmitted. There seems to be some correlation to people developing it after a long period of not getting enough sleep and working themselves too hard.

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this is definitely consistent with a fairly large sample of anecdotal evidence i saw during high school.