About 4% of inpatients at any given time have hospital-acquired infections, which adds up to more than 600,000 patients a year, according to a CDC report based on the 2011 data from 183 hospitals in 10 states. Pneumonia, surgical site infections and gastrointestinal diseases were the most common, followed by urinary tract infections and bloodstream infections. Clostridium difficile was the bacteria most commonly associated with HAIs, according to the study in the New England Journal of Medicine.

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