Asus389, what is the normal range on your functional assay? I don't have it in front of me but I think my result is around your range but the normal range goes up to the 200s so mine is only low normal. I couldn't get a count for some reason with my tests. Funkster, it's just interesting to see if you and your son had similar exposures leading to this illness. And potentially the lead time to seeing symptoms emerge. I wonder if your son's EBV is a primary infection vs. a reactivation.