Table 1.

Ceftiofur-resistant bacteria used in this study and their carriage of the bla CMY gene

Isolate(s)No. of isolatesNo. isolates with blaCMYSourceState(s)
E. coli 1512AvianGeorgia
E. coli 3431BovineMichigan, North Dakota
E. coli 11SwineOklahoma
E. coli 11Ground beefMaryland
E. coli 99Ground chickenMaryland
 All E. coli 6054
Salmonella 33BovineMichigan
Salmonella 66Ground beefMaryland
Salmonella 22Ground chickenMaryland
Salmonella 1010Ground turkeyMaryland
 AllSalmonella 2121
 Total8175