Antimicrobial susceptibility of the strains of Lactococcus garvieae isolated from cultured fish of the genus Seriola (yellowtail, amberjack and kingfish) in Japan from 2004 to 2009

Abstract

Susceptibility to 14 antimicrobials was examined for 221 strains of Lactococcus garvieae isolated from the several species of genus Seriola cultured in Japan from 2004 to 2009. Of the 221 isolates, 182 strains showed at least one resistance to oxytetracycline (OTC), erythromycin (EM) and Lincomycin (LCM). Multiple resistance to OTC, EM and LCM was observed in 11.3% of the isolates. Resistant to LCM was observed in 64.7% of the isolates. Ratio of sensitive isolates increased from 4.0% in 2003 to 23.1% in 2009. The strains resistant to OTC or EM decreased to 0% in 2009, whereas isolates resistant to LCM were found every year.