Objective: Research of clinical and microbiological characteristics in sepsis patients caused by Acinetobacter baumannii at six hospitals in Viet Nam (2011 - 2012) Method: Descriptive, prospective longitudinal follow-up. All patients diagnosed A baumannii septicemia with positive blood culturesof in 6 hospitals in 3 regions (North, Central and South) of the Vietnam, from 01/01/2011 - 30/06/2012.