Antimicrobial
Resistance and Virulence Factors of
Edwardsiella tarda
Isolated from Pet Turtles
Dong-Min Shin§, Sabrina Hossain§,
SHMP Wimalasena and Gang-Joon Heo*
Veterinary Medical Center and College of
Veterinary Medicine, Chungbuk National University, Cheongju 28644,
Korea;
*Corresponding author: gjheo@cbu.ac.kr
Abstract
Pet turtles are known as a source of bacterialinfection to humans when
handled in captivity. PathogenicEdwardsiella tarda was identified
using 16S rRNA sequencing, and characterized using conventional PCR analysis
with E. tarda-specific virulence
primer sets and antimicrobial susceptibility tests with a disk diffusion test.
E. tarda was isolated from 12 fecal
samples of 27 commercially popular pet turtles purchased through pet shops and
online markets in Korea. All isolates were confirmed as
E. tarda through biochemical analysis
and 16S rRNAsequencing. PCR analysis
showed that the virulence genes citC
and wecC were present in all isolates
and indicated their potential pathogenicity. The strains showed susceptibility
against amikacin, amoxicillin, cefoxitin, ceftriaxone, ciprofloxacin, gentamicin,
imipenem and streptomycin but were resistant to colistin and trimethoprim/sulfamethoxazole
in disk diffusion test. Intermediate resistance was noted against ampicillin and
nalidixic acid. Most isolates displayed resistance against tetracycline. These
results indicate that pet turtles pose a potential risk of exposure to a
zoonotic pathogen in humans
from a public health standpoint.
Key words:
Antimicrobial resistance, Edwardsiella tarda, Pet turtles, Virulence genes
citC, wecC