(CNN) Hospitals need to take action against the spread of a deadly, antibiotic-resistant strain of bacteria, says the Centers for Disease Control and Prevention. The bacteria kill up to half of patients who are infected.

The bacteria, called carbapenem-resistant Enterobacteriaceae or CRE, have increased over the past decade and grown resistant to even the most powerful antibiotics, according to the CDC. In the first half of 2012, 200 health care facilities treated patients infected with CRE.

“CRE are nightmare bacteria,” CDC director Dr. Tom Frieden said in a statement. “Our strongest antibiotics don’t work and patients are left with potentially untreatable infections. Doctors, hospital leaders and public health must work together now to implement CDC’s ‘detect and protect’ strategy and stop these infections from spreading.”

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