Bacterial isolates (Table 1) for this research were obtained from the collection of the Medical Faculty, University of Belgrade. There were four clinical isolates of the Acinetobacter baumannii, being previously identified and characterized as multidrug-resistant (MDR) strains (Lukovic et al., 2020 (link)). Among used isolates, GN249 and GN321 were invasive. In addition, referent ATCC 19606 strain was used. Bacterial strains were cultivated in Luria Broth (LB, Sigma Aldrich, Steinheim, Germany) medium at 37°C and stored on Luria Agar (LA, Sigma Aldrich, Steinheim, Germany) medium at the 4°C.
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