KNTV NBC Nightly News February 20, 2015 01:36:00
Possibly contributed to the deaths of two others. >> our heart goes out to the people who were involved and the patients who passed away as a result of this infection. >> reporter: the bug's been traced to two medical instruments used in a complex kind of endoscopy called ercb. it's when doctors use a device called the duoendoscopy. to examine the upper intensen. but bacteria can get trapped at its tip making it hard to clean. >> this is really the perfect storm. you have an instrument that on the whole is difficult to completely disinfect. and at the same time you have a bug that has become m...