(DAILYMAIL) — A suburban Chicago hospital has come under severe scrutiny after a very rare strain of a dangerous drug resistant strand of flu was found to be connected to a series of operations performed there.

The Centers for Disease Control has discovered 44 cases where patients in Illinois had a particular bacteria and 38 of those individuals had all recently undergone an endoscopic procedure at Advocate Lutheran General Hospital in the past year.

The bacteria, carbapenem-resistant enterobacteriaceae (CRE), is extremely difficult to treat because it has unusually high levels of tolerance to antibiotics.

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