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Abstract
The objective of this study was to investigate the prevalence and antimicrobial resistance (AMR) of S. aureus, and Streptococcus sp. isolates from swine that were raised in Son Tinh district, Quang Ngai province. The bacterial strains isolated from nasal swab samples of swine were exmined for AMR by disk diffusion method. There were 43/86 (50.00%) and 33/86 (38.40%) samples positive for S. aureus, and Streptococcus sp., respectively. The probability of bacterial isolates decreases when antimicrobial agents were introduced to prevent and/or treatment diseases in swine. The S. aureus strains show resistance to streptomycin (79.07%); cefotaxime (72.09%); oxacillin and enrofloxacin (shared 67.44%); and ampicillin (60.47%) at a high rate. In contrast, the Streptococcus sp. strains were resistant to oxacillin (96.67%); linezolid (72.73%); cefotaxime (69.70%), and streptomycin (66.67%). The high rate of S. aureus (95.35%), and Streptococcus sp. (96.67%) strains showed multi-drug resistance. Of which, one (4.65%) S. aureus and two (6.06%) Streptococcus sp. strains were resistant to 9 different antimicrobial agents. This research provides important information about high prevalence of AMR among S. aureus, and Streptococcus sp. strains. This finding raised a concern for clinical control of the diseases caused by those bacteria, as well as for developing policies and clinical practice guidelines to reduce AMR.