Possible pseudotransmission of Enterobacter cloacae associated with an endobronchial ultrasound scope.

During an investigation of positive environmental cultures with Enterobacter cloacae from an endobronchial ultrasound scope, possible pseudotransmission was discovered between 2 patients. All reprocessing steps were adhered to and the original equipment manufacture's quality control assessment of the scope could not determine the root cause. Our findings appear to be the first documented case of pseudotransmission from an endobronchial ultrasound scope and suggest bacterial transmission may exist in endoscopes without an elevator channel.