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Aeromonas veronii  is a kind of opportunistic pathogen to fish and humans, significantly impending aquaculture production. Recently, we isolated two  A. veronii  strains, named GYC1 and GYC2, from diseased Gibel carp ( Carassius   gibelio ) in China. Based on  gyr B (DNA gyrase B subunit) genes of GYC1 and GYC2, the constructed phylogenetic tree showed that the two strains were clustered with  A. veronii . Sixteen virulence genes related to the pathogenicity of  Aeromonas  spp. were subjected to PCR assay. The genes of  omp AI,  omp AII,  laf A,  act ,  aer ,  fla ,  gca T and  acg  were detected in the two strains, while genes of  hly ,  ahp ,  lip ,  ast  and  alt  were not detected. Additionally, genes  epr CAI,  ela  and  exu  were only detected in the strain GYC1. Furthermore, the results of extracellular enzyme analysis revealed that the two isolates can produce hemolysin, caseinase, esterase, amylase and lecithinase, which were closely related to the pathogenicity of the two strains. However, the results showed that there was no gelatinase activity in either strain. According to the antibiotic resistant assay, the two strains were sensitive to cephalosporins and aminoglycosides, while they were resistant to penicillins and quinolones. Through this study, the virulence characteristics, including virulence genes and extracellular enzymes, the pathogenicity of  A. veronii  was clarified, enhancing the understanding about this pathogenic bacterium and providing the theoretical basis in disease control.

Characterization of Virulence Properties of Aeromonas veronii Isolated from Diseased Gibel Carp (Carassius gibelio)