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Acinetobacter baumannii (A. baumannii) is an opportunistic pathogen that causes serious infections in the lungs, blood, and brain in critically ill hospital patients, resulting in considerable mortality rates every year. Due to the rapid appearance of multi-drug resistance or even pan-drug resistance isolates, it is becoming more and more difficult to cure A. baumannii infection by traditional antibiotic treatment, alternative strategies are urgently required to combat A. baumannii infection. In this study, we developed a DNA vaccine encoding two antigens from A. baumannii, OmpA and Pal, and the immunogenicity and protective efficacy was further evaluated. The results showed that the DNA vaccine exhibited significant immune protective efficacy against acute A. baumannii infection in a mouse pneumonia model, and cross protective efficacy was observed when immunized mice were challenged with clinical strains of A. baumannii. DNA vaccine immunization induced high level of humoral response and a mixed Th1/Th2/Th17 cellular response, which protect against lethal bacterial challenges by decreased bacterial loads and pathology in the lungs, and reduced level of inflammatory cytokines expression and inflammatory cell infiltration in BALF. These results demonstrated that it is possible to prevent A. baumannii infection by DNA vaccine and both OmpA and Pal could be serve as promising candidate antigens.

DNA vaccine encoding OmpA and Pal from Acinetobacter baumannii efficiently protects mice against pulmonary infection