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0%), and qnrD (1/67, 1.5%). The prevalent rate of mcr-1 was 6.0% (4/67). Class 1 integrons were detected in 26.9% of these isolates and contained 7 groups of resistance gene cassettes. Multilocus sequence typing analysis revealed 7 sequence types, and ST11 was the most frequent sequence types. This study indicated that reduction of Salmonella and strict control on the use of antibiotics in more than 5,000 million broilers in Shandong are the vitally important measures to keep public health.It has been reported that oral i