On an average day, about 1 in every 25 hospital patients gets sick from the hospital itself. How? By contracting what the Centers for Disease Control and Prevention (CDC) calls a healthcare-associated infection (HAI). When a patient is already sick, one of these infections can be disastrous for their prognosis, and in 2011, 75,000 of the 722,000 patients who developed an HAI died during their hospital stay. To call attention to this problem, Consumer Reports ranked hospitals across the United States based on the frequency of MRSA and C. diff, the two most common and deadly HAIs, along with three other bugs.