Antibiotic resistance profile of Streptococcus suis isolated from pigs

Abstract

Streptococcus suis is one of the most dangerous zoonotic pathogens. Antibiotics play an important role in treating diseases caused by S. suis, however, the increase of antibiotic resistance poses a significant concern. Therefore, monitoring the antibiotic susceptibility of S. suis should be conducted both in veterinary medicine and human medicine. This study was conducted aimed to determine the serotype and antibiotic resistance of S. suis isolated from 30 lung samples collecting from the sick pigs at 6 farms in Hung Yen province. The results of this study showed that 18/30 samples were positive with S. suis. Among them, 12 out of 18 S. suis isolates belonged to serotype 2. The S. suis isolates exhibited the highest resistance rate (94.44%) to tetracycline and clindamycin. In contrast, the lowest resistance rates were recoded with chloramphenicol (33.33%) and cefepime (27.78%). Particularly, 88.89% of S. suis isolates were found to be multidrug-resistant. Besides, 50% of isolates were resistant to 4 - 7 antibiotics, 39% resistant to 8 - 10 antibiotics, and 11% resistant to 1 - 3 antibiotics.