Singh H, et al. - This research was initiated in order to examine if monitoring of duodenoscope cleaning by rapid adenosine-tri-phosphate (ATP) combined with channel-purge storage could eliminate high-concern microorganisms. The inference drawn was that high-concern gram negatives but not E faecalis or environmental bacteria could be reliably eliminated following manufacturer’s instructions for reprocessing with ATP monitoring of cleaning and channel-purge storage conditions.