TABLE 2.

In vivo generation of blaCMY-2 transconjugant E. coli in experimental calves

CalfaResistance ratiobDay of first detectionDuration of detection (days)
MeanMaximum
C17.26E−079.43E−06121
T11.41E−041.76E−0343
C23.92E−044.76E−0374
T200NAcNA
C300NANA
T300NANA
C43.85E−065.00E−0531
T48.11E−048.33E−03114
C500NANA
T51.25E−057.50E−0526
C (mean)7.93E−059.64E−04NA2
T (mean)1.93E−042.03E−03NA4.3
  • a A “T” prefix indicates the treatment group; a “C” prefix indicates the control group.

  • b Resistance ratio = transconjugants (CFU/g)/total fecal E. coli (CFU/g).

  • c NA, not applicable.