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Huang X, Ning N, Li D, Chen S, Zhang L, Wang H, Bao C, Yang X, Li B, Wang H. Molecular epidemiology of Acinetobacter baumannii during COVID-19 at a hospital in northern China. Ann Clin Microbiol Antimicrob 2024; 23:63. [PMID: 39026334 PMCID: PMC11264759 DOI: 10.1186/s12941-024-00716-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 06/10/2024] [Indexed: 07/20/2024] Open
Abstract
BACKGROUND The wide spread of carbapenem-resistance clones of Acinetobacter baumannii has made it a global public problem. Some studies have shown that the prevalence of Acinetobacter baumannii clones can change over time. However, few studies with respect to the change of epidemiological clones in Acinetobacter baumannii during Corona Virus Disease 2019 (COVID-19) were reported. This study aims to investigate the molecular epidemiology and resistance mechanisms of Acinetobacter baumannii during COVID-19. RESULTS A total of 95 non-replicated Acinetobacter baumannii isolates were enrolled in this study, of which 60.0% (n = 57) were identified as carbapenem-resistant Acinetobacter baumannii (CRAB). The positive rate of the blaOXA-23 gene in CRAB isolates was 100%. A total of 28 Oxford sequence types (STs) were identified, of which the most prevalent STs were ST540 (n = 13, 13.7%), ST469 (n = 13, 13.7%), ST373 (n = 8, 8.4%), ST938 (n = 7, 7.4%) and ST208 (n = 6, 6.3%). Differently, the most widespread clone of Acinetobacter baumannii in China during COVID-19 was ST208 (22.1%). Further study of multidrug-resistant ST540 showed that all of them were carrying blaOXA-23, blaOXA-66, blaADC-25 and blaTEM-1D, simultaneously, and first detected Tn2009 in ST540. The blaOXA-23 gene was located on transposons Tn2006 or Tn2009. In addition, the ST540 strain also contains a drug-resistant plasmid with msr(E), armA, sul1 and mph(E) genes. CONCLUSION The prevalent clones of Acinetobacter baumannii in our organization have changed during COVID-19, which was different from that of China. ST540 strains which carried multiple drug-resistant mobile elements was spreading, indicating that it is essential to strengthen the molecular epidemiology of Acinetobacter baumannii.
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Affiliation(s)
- Xinlin Huang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongda Street, Fengtai District, Beijing, 100071, China
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese Peoples's Liberation Army (PLA) General Hospital, No. 100 Western 4th Middle Ring Road, Beijing, 100039, China
- School of Medical Laboratory, Weifang Medical University, Weifang, 261053, China
| | - Nianzhi Ning
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongda Street, Fengtai District, Beijing, 100071, China
| | - Deyu Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongda Street, Fengtai District, Beijing, 100071, China
| | - Suming Chen
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese Peoples's Liberation Army (PLA) General Hospital, No. 100 Western 4th Middle Ring Road, Beijing, 100039, China
| | - Liangyan Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongda Street, Fengtai District, Beijing, 100071, China
| | - Huan Wang
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese Peoples's Liberation Army (PLA) General Hospital, No. 100 Western 4th Middle Ring Road, Beijing, 100039, China
| | - Chunmei Bao
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese Peoples's Liberation Army (PLA) General Hospital, No. 100 Western 4th Middle Ring Road, Beijing, 100039, China
| | - Xiaolan Yang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongda Street, Fengtai District, Beijing, 100071, China
| | - Boan Li
- Department of Clinical Laboratory, the Fifth Medical Center, Chinese Peoples's Liberation Army (PLA) General Hospital, No. 100 Western 4th Middle Ring Road, Beijing, 100039, China.
- School of Medical Laboratory, Weifang Medical University, Weifang, 261053, China.
| | - Hui Wang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongda Street, Fengtai District, Beijing, 100071, China.
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Sun F, Zhang L, Ma X, Ali T, Wu Y, Li L. A promising metabolite, 9-aminominocycline, restores the sensitivity of tigecycline against tet(X4)-positive Escherichia coli. Front Microbiol 2024; 15:1432320. [PMID: 39044954 PMCID: PMC11264248 DOI: 10.3389/fmicb.2024.1432320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 06/20/2024] [Indexed: 07/25/2024] Open
Abstract
The emergence and widespread of tigecycline resistance undoubtedly poses a serious threat to public health globally. The exploration of combination therapies has become preferred antibacterial strategies to alleviate this global burden. In this study, tigecycline-resistant tet(X4)-positive Escherichia coli were selected for adjuvant screening. Interestingly, 9-aminominocycline (9-AMC), one of the tigecycline metabolites, exhibits synergistic antibacterial activity with tigecycline using checkerboard assay. The efficacy in vitro and in vivo was evaluated, and the synergistic mechanism was further explored. The results suggested that 9-AMC combined with tigecycline could inhibit the growth of antibiotic resistant bacteria, efficiently retard the evolution of tet(X4) gene and narrow the drug mutant selection window. In addition, the combination of tigecycline and 9-AMC could destroy the normal membrane structure of bacteria, inhibit the formation of biofilm, remarkably reduce the level of intracellular ATP level, and accelerate the oxidative damage of bacteria. Furthermore, 9-AMC is more stable in the bind of Tet(X4) inactivating enzyme. The transcriptomics analysis revealed that the genes related to the 9-AMC and tigecycline were mainly enriched in ABC transporters. Collectively, the results reveal the potentiation effects on tigecycline and the probability of 9-AMC as a novel tigecycline adjuvant against tet(X4)-positive Escherichia coli, which provides new insights for adjuvant screening.
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Affiliation(s)
- Feifei Sun
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
- NHC Key Laboratory of Food Safety Risk Assessment, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Lin Zhang
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
| | - Xuan Ma
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
| | - Tariq Ali
- College of Veterinary Sciences, University of Agriculture, Peshawar, Peshawar, Pakistan
| | - Yongning Wu
- NHC Key Laboratory of Food Safety Risk Assessment, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Lin Li
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
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Weng Z, Yang N, Shi S, Xu Z, Chen Z, Liang C, Zhang X, Du X. Outer Membrane Vesicles from Acinetobacter baumannii: Biogenesis, Functions, and Vaccine Application. Vaccines (Basel) 2023; 12:49. [PMID: 38250862 PMCID: PMC10818702 DOI: 10.3390/vaccines12010049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/25/2023] [Accepted: 12/29/2023] [Indexed: 01/23/2024] Open
Abstract
This review focuses on Acinetobacter baumannii, a Gram-negative bacterium that causes various infections and whose multidrug resistance has become a significant challenge in clinical practices. There are multiple bacterial mechanisms in A. baumannii that participate in bacterial colonization and immune responses. It is believed that outer membrane vesicles (OMVs) budding from the bacteria play a significant role in mediating bacterial survival and the subsequent attack against the host. Most OMVs originate from the bacterial membranes and molecules are enveloped in them. Elements similar to the pathogen endow OMVs with robust virulence, which provides a new direction for exploring the pathogenicity of A. baumannii and its therapeutic pathways. Although extensive research has been carried out on the feasibility of OMV-based vaccines against pathogens, no study has yet summarized the bioactive elements, biological activity, and vaccine applicability of A. baumannii OMVs. This review summarizes the components, biogenesis, and function of OMVs that contribute to their potential as vaccine candidates and the preparation methods and future directions for their development.
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Affiliation(s)
- Zheqi Weng
- The Second Clinical Medical School, Nanjing Medical University, Nanjing 210011, China
| | - Ning Yang
- Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital of Nanjing Medical University, Nanjing 210011, China
| | - Shujun Shi
- The Second Clinical Medical School, Nanjing Medical University, Nanjing 210011, China
| | - Zining Xu
- The Second Clinical Medical School, Nanjing Medical University, Nanjing 210011, China
| | - Zixu Chen
- The Second Clinical Medical School, Nanjing Medical University, Nanjing 210011, China
| | - Chen Liang
- The Second Clinical Medical School, Nanjing Medical University, Nanjing 210011, China
| | - Xiuwei Zhang
- Department of Respiratory and Critical Care Medicine, The Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing 211100, China
| | - Xingran Du
- Department of Respiratory and Critical Care Medicine, The Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing 211100, China
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