Table 1.

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

Isolate(s)No. of isolatesNo. isolates with blaCMYSourceState(s)
E. coli1512AvianGeorgia
E. coli3431BovineMichigan, North Dakota
E. coli11SwineOklahoma
E. coli11Ground beefMaryland
E. coli99Ground chickenMaryland
 All E. coli6054
Salmonella33BovineMichigan
Salmonella66Ground beefMaryland
Salmonella22Ground chickenMaryland
Salmonella1010Ground turkeyMaryland
 AllSalmonella2121
 Total8175