“…Flow cytometry (FCM) , is a device that passes cells or micrometer particles through the point of contact where the laser beams affect them, and the light that they absorb which is based on the intrinsic or sub-physical properties of the particle itself, Scatter or diffuse, and this light can be measured (1,2). Today, flow cytometry is a tool for bacterial analysis, detection, enumeration, determining changes in cellular function, metabolic activity, cell viability and antibiotic susceptibility of bacteria (3,32). Over the past decade, the presence of Acinetobacter baumannii, especially multiple drug resistant A. baumannii (MDRAB), has been recognized as the most important pathogen and cause of hospital mortality worldwide.…”