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피부 궤양이 발생한 금붕어(Carassius auratus)에서 분리한 Aeromonas veronii의 특성 및 병원성 분석

A study on the characteristics and pathogenicity of Aeromonas veronii isolated from infected goldfish (Carassius auratus)

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초록

Aeromonas spp. infections have been reported to cause significant economic losses not only in the ornamental fish industry but also in aquaculture. In December 2022-January 2023, an Aeromonas infection occurred on a goldfish in korea, A gram-negative bacterium was isolated from the skin and internal organs of infected goldfish (Carassius auratus). The results showed that the isolate was identified as Aeromonas veronii using 16S rDNA targeted oilgpnucleotide primers, furthermore charac-teristics of A. veronii was confirmed by enterotoxin gene, infectious experiment, antibiotic resistance. In-vivo pathogenicity of isolates to goldfsh resulted in 100% mortality in challenged host within one week of post experiment injection. As a result of PCR analysis targeting three enterotoxin-encoding genes, cytotoxic enterotoxin (act) was identified in A. veronii isolate in this study. Antimicrobial susceptibility pattern of isolate showed it was to susceptible to most antimicrobial agents tested but resistant to ampicillin, imipenem, meropenem and clindamycin.

Abstract

Aeromonas spp. infections have been reported to cause significant economic losses not only in the ornamental fish industry but also in aquaculture. In December 2022-January 2023, an Aeromonas infection occurred on a goldfish in korea, A gram-negative bacterium was isolated from the skin and internal organs of infected goldfish (Carassius auratus). The results showed that the isolate was identified as Aeromonas veronii using 16S rDNA targeted oilgpnucleotide primers, furthermore charac-teristics of A. veronii was confirmed by enterotoxin gene, infectious experiment, antibiotic resistance. In-vivo pathogenicity of isolates to goldfsh resulted in 100% mortality in challenged host within one week of post experiment injection. As a result of PCR analysis targeting three enterotoxin-encoding genes, cytotoxic enterotoxin (act) was identified in A. veronii isolate in this study. Antimicrobial susceptibility pattern of isolate showed it was to susceptible to most antimicrobial agents tested but resistant to ampicillin, imipenem, meropenem and clindamycin.

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