Determining antibiotic resistance of Streptococcus spp. isolated from tilapia and climbing perch raising in Northern provinces, Vietnam

Abstract

In this study, the Streptococcus spp strains isolated from the diseased tilapia and climbing perch raising in Phu Tho and Hai Duong provinces were selected for determining their antibiotic resistance with 12 different antibiotics using disc diffusion method. The antibiotic susceptibility testing results showed that the Streptococcus spp strains were highly susceptible to tetracycline, doxycycline (tetracyclin group), florphenicol (phenicol group), erythromycin and rifampicin (macrolide group), vancomycin (polypeptid group). However, they were resistant to ampicillin and oxacillin (ß-lactam group), trimethoprim/sulfameyhoxazole (sulfamid/trimethoprim group) and were totally resistant to streptomycin, neomycin (aminoglycoside group) and novobiocin (polypeptid group). The resistance with several antibiotics was observed in some tested Streptococcus spp strains, of which resistance with at least 2 antibiotics and up to 6 antibiotics. These results provide a scientific database on antibiotic resistance of pathogenic Streptococcus bacteria in aquaculture in Viet Nam.