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Cystic fibrosis (CF) pulmonary exacerbation incidence rates per 10,000 person-months by age group and US influenzalike illness rates, July 2003 through June 2007. Weekly influenzalike illness rates are from US influenza surveillance data.21,22 Influenzalike illness rates are plotted on the Wednesday of each week. CF exacerbation incidence rates are plotted on the 15th day of each calendar month.
