qnrA was found in most common Entero- bacteriaceae, including Escherichia coli (E coli), Klebsiella spp, Enterobacter spp, Citrobacter freundii, and Provi- dencia stuartii [4], and it was located in complex sul1-type class 1 integrons[5]. qnrB and qnrS were identified in clini- cal ...