A total of 179 patients at Ronald Reagan UCLA Medical Center were exposed to CRE during endoscopic procedures between October and January, University of California, Los Angeles spokeswoman Dale Tate said yesterday.
The bacteria may have been a "contributing factor" in the deaths of two patients, a university statement said.
Similar outbreaks of Carbapenem-Resistant Enterobacteriaceae (CRE) have been reported around the nation. They are difficult to treat because some varieties are resistant to most known antibiotics.
The bacteria can cause infections of the bladder or lungs, leading to coughing, fever or chills. CRE infections have been reported in every state except Idaho, Alaska and Maine, according to the CDC.
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UCLA said infections may have been transmitted through two endoscopes used during the diagnosis and treatment of pancreatic and bile-duct problems.
"We notified all patients who had this type of procedure, and we were using seven different scopes. Only two of them were found to be infected. In an abundance of caution, we notified everybody," Tate said.
Potentially infected patients are being sent free home-testing kits that UCLA will analyse, the university said.
A similar outbreak occurred in Illinois in 2013. Dozens of patients were exposed to CRE, with some cases apparently linked to a tainted endoscope used at Advocate Lutheran General Hospital.
The hospital later changed its sterilisation procedures. A Seattle hospital, Virginia Mason Medical Center, reported in January that CRE linked to an endoscope sickened at least 35 patients, and 11 died, although it was unclear whether the infection played a role in their deaths.