General View of Cedars-Sinai Hospital on June 17, 2013 in Los Angeles, California.
Frederick M. Brown—Getty Images
March 4, 2015 8:06 PM EST

Four patients have been infected with a deadly superbug at Cedars-Sinai Medical Center in Los Angeles, the hospital said Wednesday, and an additional 64 may have been exposed.

Cedars-Sinai began investigating a possible link between CRE infections and one Olympus Corp. duodenoscope used from August to February of 2014 in a procedure called endoscopic retrograde cholangiopancreatography (ERCP), according to the Los Angeles Times. That involves putting a scope down a patient’s throat to diagnose and treat problems in the digestive tract, like gallstones and cancer; about 500,000 people undergo ERCP every year.

MORE: What You Need to Know About the California ‘Superbug’

A similar outbreak occurred at UCLA’s Ronald Reagan Medical Center in mid-February. There, five people were infected by medical scopes with CRE bacteria, and two of them died.

CRE, or carbapenem-resistant Enterobacteriaceae, kills up to half of those infected. One of the four patients at Cedars-Sinai has died, but the hospital said it was for an unrelated reason.

[Los Angeles Times]

Write to Eliana Dockterman at eliana.dockterman@time.com.

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