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Peer-reviewedCC BY 4.0International Journal of Molecular Sciences

Isolation, Identification, and Pathogenicity of Aeromonas veronii from Diseased Paracobitis variegatus

  • Zhiqiang Zhang1,2
  • Yiling Zhou1,2
  • Qing Zhou1,2
  • Ying Wang1,2
  • Changlun Xiao3
  • Dayong Xu1,2
  1. 1Key Laboratory of Application of Ecology and Environmental Protection in Plateau Wetland of Sichuan, Xichang University, Xichang 415000, China
  2. 2Key Laboratory of Animal Disease Detection and Prevention in Panxi District, Xichang University, Xichang 415000, China
  3. 3Institute of Animal Husbandry and Fisheries, Yibin Academy of Agricultural Sciences, Yibin 644600, China
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Abstract

Aeromonas veronii (A. veronii) is ubiquitous in aquatic habitats and infects diverse aquatic animals, causing high mortality and heavy economic losses in aquaculture. In this study, we initially isolated a Gram-negative bacterium (Pv001) from the visceral organs of naturally diseased Paracobitis variegatus. Based on morphological, biochemical, and 16S rRNA and gyrB gene sequence analysis, the isolated strain was accurately determined to be A. veronii. Virulence gene screening showed that the strain Pv001 carried multiple virulence genes, including Acg, Act, Alt, Exu, Lip, and Omp. In vitro antimicrobial evaluations revealed that ceftriaxone, chloramphenicol, ciprofloxacin, and tetracycline displayed significant inhibitory effects on Pv001, while ampicillin, penicillin, and lincomycin exhibited no detectable inhibitory action. The artificial challenge of Paracobitis variegatus with the isolated strain Pv001 via intraperitoneal injection reproduced the clinical signs observed in the affected farm, yielding a calculated LD50 of 8.61 × 105 CFU/fish. Histopathological analysis of the diseased fish indicated extensive intestinal mucosal destruction, vacuolar degeneration of liver cells, and localized necrosis, as well as a considerable number of melano-macrophage centers (MMCs) aggregating in the spleen. This study provides a scientific foundation for the prevention and control of epidemics by revealing the pathogenic features of A. veronii illness in P. variegatus.

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Cite

BibTeXRIS
BibTeX
@article{zhang2026isolation,
  title = {{Isolation, Identification, and Pathogenicity of Aeromonas veronii from Diseased Paracobitis variegatus}},
  author = {Zhiqiang Zhang and Yiling Zhou and Qing Zhou and Ying Wang and Changlun Xiao and Dayong Xu},
  journal = {International Journal of Molecular Sciences},
  year = {2026},
  month = oct,
  doi = {10.3390/ijms27219776},
  url = {https://www.mdpi.com/1422-0067/27/21/9776},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Isolation, Identification, and Pathogenicity of Aeromonas veronii from Diseased Paracobitis variegatus
AU  - Zhiqiang Zhang
AU  - Yiling Zhou
AU  - Qing Zhou
AU  - Ying Wang
AU  - Changlun Xiao
AU  - Dayong Xu
PY  - 2026
DA  - 2026/10/30
JO  - International Journal of Molecular Sciences
DO  - 10.3390/ijms27219776
UR  - https://www.mdpi.com/1422-0067/27/21/9776
AB  - Aeromonas veronii (A. veronii) is ubiquitous in aquatic habitats and infects diverse aquatic animals, causing high mortality and heavy economic losses in aquaculture. In this study, we initially isolated a Gram-negative bacterium (Pv001) from the visceral organs of naturally diseased Paracobitis variegatus. Based on morphological, biochemical, and 16S rRNA and gyrB gene sequence analysis, the isolated strain was accurately determined to be A. veronii. Virulence gene screening showed that the strain Pv001 carried multiple virulence genes, including Acg, Act, Alt, Exu, Lip, and Omp. In vitro antimicrobial evaluations revealed that ceftriaxone, chloramphenicol, ciprofloxacin, and tetracycline displayed significant inhibitory effects on Pv001, while ampicillin, penicillin, and lincomycin exhibited no detectable inhibitory action. The artificial challenge of Paracobitis variegatus with the isolated strain Pv001 via intraperitoneal injection reproduced the clinical signs observed in the affected farm, yielding a calculated LD50 of 8.61 × 105 CFU/fish. Histopathological analysis of the diseased fish indicated extensive intestinal mucosal destruction, vacuolar degeneration of liver cells, and localized necrosis, as well as a considerable number of melano-macrophage centers (MMCs) aggregating in the spleen. This study provides a scientific foundation for the prevention and control of epidemics by revealing the pathogenic features of A. veronii illness in P. variegatus.
SN  - 1422-0067
ER  -