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Drug resistance and pulsed‐field gel electrophoresis patterns of Lactococcus garvieae isolates from cultured Seriola (yellowtail, amberjack and kingfish) in Japan
Author(s) -
Kawanishi M.,
Kojima A.,
Ishihara K.,
Esaki H.,
Kijima M.,
Takahashi T.,
Suzuki S.,
Tamura Y.
Publication year - 2005
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.2005.01690.x
Subject(s) - biology , fishery , lactococcus , zoology , microbiology and biotechnology , bacteria , lactococcus lactis , genetics , lactic acid
Aims: To investigate the existing antimicrobial susceptibility and genetic characteristics of Lactococcus garvieae isolates from cultured Seriola in Japan. Methods and Results: Minimum inhibitory concentrations (MICs) of 14 antimicrobial agents for 170 isolates were determined using the agar dilution method. Seventy‐five isolates (44·1%) were simultaneously resistant to erythromycin (EM) (MIC ≥ 2 μ g ml −1 ), lincomycin (LCM) (MIC ≥ 128 μ g ml −1 ) and oxytetracycline (OTC) (MIC ≥4 μ g ml −1 ). Resistance to EM was grouped as intermediate‐ and high‐level resistant by MIC values. All resistant isolates possessed ermB and tet (S) genes. The number of different bands between pulsed‐field gel electrophoresis patterns of 25 isolates and two ATCC strains (isolated in 1974), determined using two enzymes ( Apa I and Sma I), did not exceed 3. Conclusions: The present resistance pattern observed with ermB and tet (S) is similar to that observed in previous reports. Moreover, the genetic characteristics of L. garvieae isolates from a wide area in Japan in 2002 and ATCC strains were closely related. Significance and Impact of the Study: This study suggests that EM‐, LCM‐ and OTC‐resistant isolates have been present for 15 years and that L. garvieae strains with same origin have spread among Seriola spp. in Japan since 1974.