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Abstract
Streptococcus spp. is a bacteria causing serious diseases to humans and animals such as encephalitis, pneumonia, blood infection. This is the reason of increasing treatment costs and reducing economic efficiency in livestock production. The uncontrolled use of antibiotics is considered to be the cause of increasing antibiotic resistance to many bacteria, including Streptococcus spp.. The objectives of this study were to determine the prevalence of Streptococcus spp. and assess antibiotic resistance level of the isolated strains in pigs in Huong Tra, Thua Thien Hue . The bateria was isolated from nasal swab samples of healthy pigs by a conventional method. The antibiotic resistant of Streptococcus spp. was assessed by using the disk diffusion method. Results showed that 57.9% (40/69) samples were positive for Streptococcus spp. and there was a difference in terms of the positive rate for this bacteria in two communes (p < 0.05). The relatively high rate of Streptococcus spp. strains isolated from pigs were resistant to oxytetracycline (60.0%), linezolid (40.0%), doxycycline (33.3%). Besides, these strains were sensitive to enrofloxacin (100.0%), cefotaxime (93.3%), cephalexin (86.6%), and streptomycin (80.0%). 86.6% (12/15) strains were resistant to at least one antibiotic; 46.6% (7/15) strains showed multi-drug resistance. The results of this study provide important information to managers, veterinarians and breeders which help prevent the inappropriate use of antibiotics and restrict the antimicrobial resistance tendency in pig production.