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“Background Non-typhoidal Salmonellae are major zoonotic pathogens that commonly cause salmonellosis outbreaks. Globally, salmonellosis caused by non-typhoidal salmonellae generally results in about 1.3 billion cases of acute gastroenteritis and 3 million deaths annually [1]. In the United States, Salmonellae cause an estimated 1.4 million cases of salmonellosis and over 500 deaths annually [2]. Multi-drug resistant (MDR) Salmonella, the global spread of which is mediated by international food trade and travel, is a global public health issue [3, 4]. Often, clonal spread of MDR strains has been observed in particular serovars [4–6].