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Apparently I can't catch it. This girl I was hooking up 2 yrs ago suddenly told me she had just come down with mono. A week later we were still hooking up and I was fine.

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You could actually be infected with the virus and not know it. My ex girlfriend got really bad mono and a few months later I developed a persistant head ached and ended up going to the doctor. They did some blood work and found that I had mono. But I never really got sick at all. My girlfriend was almost hospitalized with it and all that happened to me was I got a headache. So, its quite possible that you have the virus, but not the mono.

Also, my doctor told me that once you get the virus, it always stays with you (though you may never get mono again) and you will go through periods where you can infect people for the rest of your life.