1
|
Muzahid NH, Md Zoqratt MZH, Ten KE, Hussain MH, Su TT, Ayub Q, Tan HS, Rahman S. Genomic and phenotypic characterization of Acinetobacter colistiniresistens isolated from the feces of a healthy member of the community. Sci Rep 2023; 13:12596. [PMID: 37537198 PMCID: PMC10400646 DOI: 10.1038/s41598-023-39642-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 07/28/2023] [Indexed: 08/05/2023] Open
Abstract
Acinetobacter species are widely known opportunistic pathogens causing severe community and healthcare-associated infections. One such emerging pathogen, Acinetobacter colistiniresistens, is known to exhibit intrinsic resistance to colistin. We investigated the molecular characteristics of A. colistiniresistens strain C-214, isolated from the fecal sample of a healthy community member, as part of a cohort study being conducted in Segamat, Malaysia. Comparison of the whole genome sequence of C-214 with other A. colistiniresistens sequences retrieved from the NCBI database showed 95% sequence identity or more with many of the genome sequences representing that species. Use of the Galleria mellonella killing assay showed that C-214 was pathogenic in this model infection system. The strain C-214 had a colistin and polymyxin B MIC of 32 and 16 mg/L, respectively. Besides, it was resistant to cefotaxime, amikacin, and tetracycline and showed moderate biofilm-producing ability. Different genes associated with virulence or resistance to major classes of antibiotics were detected. We observed mutations in lpxA/C/D in C-214 and other A. colistiniresistens strains as probable causes of colistin resistance, but the biological effects of these mutations require further investigation. This study provides genomic insights into A. colistiniresistens, a potentially pathogenic bacterium isolated from a community member and notes the public health threat it may pose.
Collapse
Affiliation(s)
- Nazmul Hasan Muzahid
- School of Science, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia.
| | | | - Kah Ern Ten
- School of Science, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia
| | - Md Hamed Hussain
- School of Science, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia
| | - Tin Tin Su
- South East Asia Community Observatory (SEACO), Global Public Health, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor, Malaysia
| | - Qasim Ayub
- School of Science, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia
- Monash University Malaysia Genomics Facility, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia
| | - Hock Siew Tan
- School of Science, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia
- Tropical Medicine & Biology Multidisciplinary Platform, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor, Malaysia
| | - Sadequr Rahman
- School of Science, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia.
- Monash University Malaysia Genomics Facility, Bandar Sunway, 47500, Subang Jaya, Selangor Darul Ehsan, Malaysia.
- Tropical Medicine & Biology Multidisciplinary Platform, Monash University Malaysia, Bandar Sunway, 47500, Subang Jaya, Selangor, Malaysia.
| |
Collapse
|
2
|
Acinetobacter baumannii from Samples of Commercially Reared Turkeys: Genomic Relationships, Antimicrobial and Biocide Susceptibility. Microorganisms 2023; 11:microorganisms11030759. [PMID: 36985332 PMCID: PMC10052703 DOI: 10.3390/microorganisms11030759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/05/2023] [Accepted: 03/07/2023] [Indexed: 03/18/2023] Open
Abstract
Acinetobacter baumannii is especially known as a cause of nosocomial infections worldwide. It shows intrinsic and acquired resistances to numerous antimicrobial agents, which can render the treatment difficult. In contrast to the situation in human medicine, there are only few studies focusing on A. baumannii among livestock. In this study, we have examined 643 samples from turkeys reared for meat production, including 250 environmental and 393 diagnostic samples, for the presence of A. baumannii. In total, 99 isolates were identified, confirmed to species level via MALDI-TOF-MS and characterised with pulsed-field gel electrophoresis. Antimicrobial and biocide susceptibility was tested by broth microdilution methods. Based on the results, 26 representative isolates were selected and subjected to whole-genome sequencing (WGS). In general, A. baumannii was detected at a very low prevalence, except for a high prevalence of 79.7% in chick-box-papers (n = 118) of one-day-old turkey chicks. The distributions of the minimal inhibitory concentration values were unimodal for the four biocides and for most of the antimicrobial agents tested. WGS revealed 16 Pasteur and 18 Oxford sequence types, including new ones. Core genome MLST highlighted the diversity of most isolates. In conclusion, the isolates detected were highly diverse and still susceptible to many antimicrobial agents.
Collapse
|
3
|
Molecular Characterization of German Acinetobacter baumannii Isolates and Multilocus Sequence Typing (MLST) Analysis Based on WGS Reveals Novel STs. Pathogens 2021; 10:pathogens10060690. [PMID: 34206118 PMCID: PMC8229575 DOI: 10.3390/pathogens10060690] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/28/2021] [Accepted: 05/29/2021] [Indexed: 01/14/2023] Open
Abstract
Acinetobacter baumannii (A. baumannii) is a major cause of severe nosocomial infections worldwide. The emergence of infections associated with A. baumannii poses a significant health risk in Germany. A. baumannii is part of the ACB complex and is difficult to distinguish from other species phenotypically, necessitating its reliable identification. The current study analyzed 89 A. baumannii strains from human and non-human origins by matrix-assisted laser desorption/ionization (MALDI–TOF) and PCR detection of intrinsic blaOXA-51-like carbapenemase, blaOXA-23-like, blaOXA-24-like, blaOXA-58-like, and ISAba 1 genes. Whole-genome sequencing (WGS) was applied for species confirmation and strain type determination. Combining the molecular detection of the intrinsic blaOXA-51-like carbapenemase gene together with MALDI–TOF with a score value of >2.300 proved to be a suitable tool for A. baumannii identification. WGS data for all of the sequenced strains confirmed the identity of all A. baumannii strains. The Pasteur scheme successfully assigned 79.7% of the strains into distinct STs, while the Oxford scheme succeeded in allocating only 42.7% of isolates. Multilocus sequence typing (MLST) analysis based on the Pasteur scheme identified 16 STs. ST/241 was the most prevalent in samples from non-human origin, whereas ST/2 was predominant in human samples. Furthermore, eight isolates of non-human origin were allocated to seven new STs (ST/1410, ST/1414, ST/1416, ST/1417, ST/1418, ST/1419, and ST/1421). Ten isolates from non-human origin could not be typed since new alleles were observed in the loci Pas_cpn60, Pas_rpoB, and Pas_gltA. MLST analysis based on the Pasteur scheme was more appropriate than the Oxford scheme for the current group of A. baumannii.
Collapse
|