Study of antibacterial and antibiofilm activity of Bacteriocin in patients with Acinitobacter baumannii chest infection

Acinetobacter baumannii is a Gram-negative opportunistic bacterium associated with nosocomial and community-acquired illnesses. This pathogen is rapidly expanding on a global scale and is linked to the development of resistance against numerous antibiotics. Therefore, this research aims to investigate the activities of bacteriocin as antibacterial and antibiofilm against Acinetobacter baumannii. Sputum specimens were collected from sixty patients with respiratory tract infections admitted to the respiratory care unit in three hospitals in Baghdad. Acinetobacter baumannii was isolated and identified using biochemical tests, and the diagnosis of the isolates was validated. An antibiotic susceptibility test was conducted using the VITEC 2 systems. Biofilm formation was detected using a microtiter plate assay. Bacteriocin extract from Lactobacillus was employed to assess antibiofilm activity via the microtiter plate method, while antibacterial activity was determined using the agar well diffusion method. The results showed that the prevalence of Acinetobacter baumannii was 30% among Iraqi samples. In this study, Acinetobacter baumannii showed higher overall resistance to most antibiotics (100%). In addition, the overall sensitivity for colistin antibiotic was (100%), accompanied with good inhibitory effect against A. buamannii growth that associated with a definitive effect on biofilm production by this bacteria. In conclusion, the study approved the validity of bacteriocin against Acinetobacter baumannii. The authors suggests the possibility of utilization of bacteriocine as effective adjuvants and bio control agents for treatment and eliminating multidrug bacteria using the novel technique.