Isolation of Multidrug-Resistant <i>Stenotrophomonas maltophilia</i> from Cultured Yellowtail ( <i>Seriola quinqueradiata</i> ) from a Marine Fish Farm

Abstract

Six strains of multidrug-resistant Stenotrophomonas maltophilia were isolated from cultured yellowtail. The strains were divided into two clusters based on the 16S rRNA genes, and all of them contained L1 metallo-beta-lactamase and L2 beta-lactamase genes. Differences in the intercluster divergence between the lactamase genes suggest that horizontal transfer of the genes occurred.