B. ContextB.1. Characteristics of Acinetobacter baumannii and the infections they cause Acinetobacter baumannii is an aerobic, non-fermentative Gram-negative bacterium [6]. This bacteria is an opportunistic pathogen present in soil and water. In addition, it is generally isolated from the hospital environment and hospitalized patients; therefore, it is known to cause nosocomial infections [6,9]. In addition, this bacterium has the ability to adhere and form biofilms on abiotic surfaces as well as the capacity to secrete exopolysaccharide (EPS), a substance that allows bacterial cells to bind to the surface and to each other [ 6.9]. Furthermore, this bacterium is capable of developing new resistance to antibiotics by several mechanisms such as inhibition of the 30S ribosomal subunit, mutations or efflux..