Data collected more than 30 years ago on the incidence of infectious mononucleosis show the highest rates in persons 10 to 19 years of age (six to eight cases per 1,000 persons per year).2,3 The incidence in persons younger than 10 years and older than 30 years is less than one case per 1,000 persons per year,2,So the poster has a 99.2% - 99.4% chance of not getting mono in a given year between the ages of 10 and 19, so if we assume that the likelyhood is about the same in the early 20s, the chances that the someone would get mono is just 2.4% - 3.2%. In other words she will probably not get mono. In fact, it's very unlikely that she will.
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posted by delmoi at 9:52 PM on May 15