Detection of Salmonella enterica Isolates Producing CTX-M Cephalosporinase in U.S. Livestock Populations

We report the detection of Salmonella carrying blaCTX-M in U.S. livestock populations. We identified 12 of 2,034 (0.6%) Salmonella isolates originating from turkeys, horses, and pigs from at least 6 U.S. states, all carrying blaCTX-M-1, many on a pandemic sequence type 1 IncN plasmid.