한국수산과학회

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kfas, vol. 54, no. 6, pp.912-917, December, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0912

Detection Characteristics and Antimicrobial Resistance of Vibrio vulnificus
Isolated from Sea Water Along the Gadeok Island Coast
가덕도 연안 해수에서 분리된 Vibrio vulnificus의 검출 특성 및 항생제 내성

오희경1·정희진2·정금재2·신혜영3·신중호1,4·정원교1,4·오정환1,4·김영목2*
1부경대학교 4차산업융합바이오닉스공학과, 2부경대학교 식품공학과, 3강릉원주대학교 해양식품공학과, 4부경대학교 의공학과

We investigated the distribution, molecular characteristics, and antimicrobial resistance of Vibrio vulnificus isolated
from seawater at Gadeok Island, the Republic of Korea between June to October. Interestingly no isolates were detected
between December to February. The detection rate of V. vulnificus was high (80-100%) from July to September
2019 and from June to September 2020. This coincided with the relatively low salinity of the seawater, which ranged
from 7.8-29.9 practical salinity units for that period. Additionally, V. vulnificus had a high detection rate at sampling
stations near the Nakdong river. The detection rates of virulence genes, such as vvhA, viuB, and vcgC, among the
isolates were 97.1%, 44.1%, and 57.4% in 2019 and 100%, 43.0%, and 50.0% in 2020, respectively. Notably, viuB
and vcgC were detected in V. vulnificus isolated between June to October when water temperature was above 20°C.
The antimicrobial susceptibility analysis of 80 isolates revealed that most of the strains were susceptible to most antimicrobial
agents. However, some isolates showed intermediate resistance to cefepime (18.8%), cefoxitin (58.8%),
and erythromycin (22.5%). Of note, 3.8% of the tested strains were resistant to cefoxitin. The minimum inhibitory
concentration of highly cefoxitin-resistant strains was determined to be less than 32 μg/mL.

Keyword : Antimicrobial resistance, Vibrio vulnificus, Virulence genes

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