In vitro investigation of the susceptibility of Acinetobacter baumannii strains isolated from clinical specimens to ampicillin/sulbactam alone and in combination with amikacin.

The sensitivity of 52 strains of Acinetobacter baumannii was determined to 13 antimicrobial drugs. All strains tested were multiresistant. Compared with MICs of amikacin and ampicillin/sulbactam alone, there was a significant decrease in MICs for both drugs when the combination was used. The results of the in vitro study of this combination showed a synergistic or partial synergistic effect in 98% of the strains.