1Key
Laboratory of Livestock Infectious Diseases in Northeast China,
Ministry of Education, College of Animal Science and Veterinary
Medicine, Shenyang Agricultural University, China
ɸ
These two authors contribute equally to this research.
*Corresponding author:
liumingchun@syau.edu.cn;
zhangdx@syau.edu.cn
Abstract
Streptococcus suis (S.
suis) is an important zoonotic agent, leading to sepsis, meningitis,
arthritis, encephalitis, and pneumonia both in swine and humans. This study aims
to illustrate the antimicrobial susceptibility, integron genes, and virulence
gene profiles of Streptococcus suis
from pigs in Liaoning province of China. The results indicated that virulence
genes including gdh,
pgdA,
srtA, gapdh, and dltA, were
positive in all S. suis isolates, and
sly,
manN, and purD were
carried by 68.18, 63.64, and 68.18% of isolates, respectively. A variety of
virulence gene profiles were observed in this study. Most
S. suis isolates were non-susceptible to chlortetracycline (17/22),
tetracycline (20/22), marbofloxacin (19/22), erythromycin (17/22), azithromycin
(15/22), penicillin (16/22), oxacillin (18/22), ceftiofur(14/22), and timicosin
(18/22) by the broth microdilution method. Although no isolate was
non-susceptible to all tested antimicrobial agents, 81.82% (18/22) of isolates
were non-susceptible to at least 7 tested antimicrobial agents in this study,
and all isolates were non-susceptible to at least three antimicrobial agents
tested in this study. In this study, 95.45% of isolates were positive for
Integrase intI I, which indicated that
intI I, such as
drfA1 and
aadA1, may be involved in multidrug resistance. Our results
indicated that caution should be paid when choosing antimicrobial agents in pig
herds in this area as multi-resistance has emerged, and mobile genetic elements
such as drfA1 and
aadA1 may be involved in resistance of
S. suis isolates.
To Cite This Article:
Guo Y, Li R, Sun X, Zhang Z, Zheng H, Han L, Cui
Y, Zhang D and Liu M, 2022. In vitro
antibiotic susceptibility, virulence genes profiles and integrons of
streptococcus suis isolates from pig
herds in Liaoning Province of China. Pak Vet J, 42(1): 117-121. http://dx.doi.org/10.29261/pakvetj/2021.074