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Background: Salmonella enterica subsp. enterica serovar Virchow (antigenic formula 1formula 6,9,12[Vi]:g,p:--7,14:r:1,2 ) is a serovar of the O:9 7(DC₁) serogroup. S. Virchow is a serovar adapted to cattle, which is the primary host, but it can also infect and cause disease in different hosts, including humans. In cattle, S. Virchow causes acute and subclinical disease; symptoms of salmonellosis in cattle include: fever, diarrhea, abortions, respiratory signs (especially in calves), and systemic disease. S. Virchow is a zoonosis that causes one of the highest rates of systemic disease among all non-typhoidal salmonellosis cases in humans. Recently, the Animal Health Diagnostic Center at Cornell University published an animal health advisory that indicated an increase in the isolation of multidrug resistant strains of S. Dublin in New York. Among ceftriaxone-resistant Salmonella isolates reported by the National Antimicrobial Resistance Monitoring System (NARMS), S. Dublin represents the 40.8% and 2.9% of isolates from cattle and humans, respectively.

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