ArticleBMC microbiology2025
Comparative study of phenotypic and genotypic expression of virulence factors in colonizing and pathogenic carbapenem resistant Acinetobacter baumannii (CRAB).
Article in BMC microbiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- New Insights intoPathogens (Basel, Switzerland) · 2026Review
- Phenotype-Genotype Discordance in Antimicrobial Resistance ofPathogens (Basel, Switzerland) · 2026Review
- Draft genome sequence of an Acinetobacter baumannii strain belonging to CC79 isolated from a reference hospital in Brazil.Molecular biology reports · 2026Article
- Ward microclimate and procedural factors as predictors for CRAB environmental contamination in ICUs: a longitudinal monitoring study.Antimicrobial resistance and infection control · 2026Article
- Molecular analysis of carbapenem-resistantFrontiers in cellular and infection microbiology · 2026Article
- Feasibility and Potential Clinical Ramifications of Using Bacteriophage Therapy forJournal of clinical medicine · 2025Article
- When the Last Line Fails: Characterization of Colistin-ResistantPathogens (Basel, Switzerland) · 2025Article
- Comparative genomics of Acinetobacter baumannii from Egyptian healthcare settings reveals high-risk clones and resistance gene mobilization.BMC infectious diseases · 2025Article
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7 authors.
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Abstract
Carbapenem resistant Acinetobacter baumannii has evolved as the most troublesome microorganism with multiple virulence factors. Biofilm formation, porins, micronutrient capturing mechanism and quorum sensing, provide protection against desiccation, host-pathogen killing and enhance its persistence. The conservation of these factors between colonizing and pathogenic carbapenem resistant A. baumannii has been barely investigated. We studied biofilm formation, desiccation survival, motility and hemolysis in pathogenic carbapenem resistant A. baumannii and colonizer carbapenem resistant A. baumannii from the hospital environment. The virulent genes pgaA, csuE, bap, ompA, abaI, pilA and bauA were detected by simplex-PCR and Quantitative Real-Time PCR was done for expressional studies. In-vivo survival percentage was studied by Galleria mellonella (wax moth) killing assay. Phenotypic characterization revealed that the biofilm formation and desiccation survival proportion was significantly higher in colonizer carbapenem resistant A. baumannii (p < 0.05). Twitching motility was found comparable (mean 0.5 to 1.5 cm). Surface associated motility varied widely. None showed hemolysis. The csuE, bap, ompA, abaI, pilA and bauA genes were detected in almost all the pathogenic and colonizer carbapenem resistant A. baumannii isolates while none harboured pgaA gene. The expression of bap, ompA and bauA gene was found significantly higher in pathogenic carbapenem resistant A. baumannii while expression of csuE and abaI gene was comparable in both. Overexpression of pilA gene was seen in those with higher surface associated motility. Pathogenic carbapenem resistant A. baumannii showed significantly higher pathogenicity in-vivo, as 100% of larvae died on 4th day post-infection. In conclusion high level expression of outer membrane proteins (ompA) and siderophores is significantly associated with the pathogenicity in carbapenem resistant A. baumannii isolated from infections, which can be a differentiating point from the colonizers. CLINICAL TRIAL: Not Applicable.
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