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Dollery SJ, Zurawski DV, Bushnell RV, Tobin JK, Wiggins TJ, MacLeod DA, Tasker NJPER, Alamneh YA, Abu-Taleb R, Czintos CM, Su W, Escatte MG, Meeks HN, Daly MJ, Tobin GJ. Whole-cell vaccine candidates induce a protective response against virulent Acinetobacter baumannii. Front Immunol 2022; 13:941010. [PMID: 36238282 PMCID: PMC9553005 DOI: 10.3389/fimmu.2022.941010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 09/02/2022] [Indexed: 11/13/2022] Open
Abstract
Acinetobacter baumannii causes multi-system diseases in both nosocomial settings and a pre-disposed general population. The bacterium is not only desiccation-resistant but also notoriously resistant to multiple antibiotics and drugs of last resort including carbapenem, colistin, and sulbactam. The World Health Organization has categorized carbapenem-resistant A. baumannii at the top of its critical pathogen list in a bid to direct urgent countermeasure development. Several early-stage vaccines have shown a range of efficacies in healthy mice, but no vaccine candidates have advanced into clinical trials. Herein, we report our findings that both an ionizing γ-radiation-inactivated and a non-ionizing ultraviolet C-inactivated whole-cell vaccine candidate protects neutropenic mice from pulmonary challenge with virulent AB5075, a particularly pathogenic isolate. In addition, we demonstrate that a humoral response is sufficient for this protection via the passive immunization of neutropenic mice.
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Affiliation(s)
- Stephen J. Dollery
- Biological Mimetics, Inc., Frederick, MD, United States
- *Correspondence: Stephen J. Dollery,
| | - Daniel V. Zurawski
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | | | - John K. Tobin
- Biological Mimetics, Inc., Frederick, MD, United States
| | | | | | | | - Yonas A. Alamneh
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Rania Abu-Taleb
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Christine M. Czintos
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Wanwen Su
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Mariel G. Escatte
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Heather N. Meeks
- Defense Threat Reduction Agency, Fort Belvoir, VA, United States
| | - Michael J. Daly
- Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
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