Genomic insights into NDM-1-producing Pseudomonas aeruginosa: Current status in a Bulgarian tertiary hospital and on the Balkans.
Acta Microbiol Immunol Hung
; 71(2): 99-109, 2024 Jul 02.
Article
en En
| MEDLINE
| ID: mdl-38857113
ABSTRACT
The present study aimed to explore the genomic characteristics of eight New Delhi metallo-ß-lactamase-1 (NDM-1)-producing carbapenem-resistant Pseudomonas aeruginosa (CRPA) isolates from a Bulgarian tertiary hospital (2021-2023) in comparison to blaNDM-1-positive strains originating from the Balkans. Antimicrobial susceptibility testing, phenotypic assays for carbapenemase activity, PCR screening, whole-genome sequencing (WGS), and phylogenomic analysis were performed. Seven of the CRPA isolates investigated (Minimum inhibitory concentration values of imipenem and meropenem >32 mg L-1) were also resistant to piperacillin-tazobactam, ceftazidime, ceftazidime-avibactam, cefepime, ceftolozane-tazobactam, amikacin, tobramycin, ciprofloxacin, and levofloxacin, but were susceptible to colistin (0.5-2 mg L-1) and cefiderocol (0.25-1 mg L-1). The P. aeruginosa Pae57 isolate (designated Pae57) remained susceptible to aminoglycosides as well. WGS uncovered the co-existence of blaNDM-1 and blaGES-1. The isolates belonged to the ST654 high-risk clone, except for Pae57 (ST611). Alignment against reference sequences revealed the presence of a Tn21 transposon harboring bleMBL-blaNDM-1-ISAba125. It was similar to that found in the P. aeruginosa ST654 NDM1_1 strain (GCA_020404785.1) from Serbia. Phylogenomic analysis of our isolates indicated that seven of them (ST654) differed from each other in no more than 44 single-nucleotide polymorphisms (SNPs). Pae57 (ST611) was strikingly different (>21,700 SNPs) compared to all Balkan strains. In conclusion, to our knowledge this is the first report of blaNDM-1-positive P. aeruginosa ST611 isolation, which indicates the transmission dynamics of this determinant between high-risk and potentially high-risk P. aeruginosa clones. Obtained results unveil the dissemination of clonally related NDM-1-producing P. aeruginosa strains in the monitored hospital for approximately a 2-year period.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Filogenia
/
Pseudomonas aeruginosa
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Infecciones por Pseudomonas
/
Beta-Lactamasas
/
Pruebas de Sensibilidad Microbiana
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Centros de Atención Terciaria
/
Antibacterianos
Límite:
Humans
País/Región como asunto:
Europa
Idioma:
En
Revista:
Acta Microbiol Immunol Hung
Asunto de la revista:
ALERGIA E IMUNOLOGIA
/
MICROBIOLOGIA
Año:
2024
Tipo del documento:
Article
País de afiliación:
Bulgaria
Pais de publicación:
Hungria