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Colleges have seen a surge in the rates at which students are being diagnosed with H1N1 or similar flu illnesses, according to new data from the American College Health Association. The association has been using a national sample of 270 colleges and universities to track the spread of H1N1, and, in the last week, the rate of cases increased by 34 percent. In addition, several regions where H1N1 had appeared to be in decline -- the Northeast, Southeast, Mid-Atlantic and the Midwest -- saw increases. Of the colleges in the survey, 97 percent reported new cases. Details on the latest data are available here.