Table 12.

Summary of calf-level culture and susceptibility (C/S) results at 1DOF and 13DOF and their association with individual calf risk of BRD and likelihood of subsequent C/S patterns at time of treatment.

BRD risk given C/S results near arrival
Risk factor	Outcome	Significant risk factors for increasing risk*
C/S results at 1DOF	Risk of BRD ≤ 13DOF	Tetracycline resistance
C/S results at 1DOF	Risk of BRD ≤ 45 DOF	None
C/S results at 13DOF	Risk of BRD > 13DOF	M. haemolytica, P. multocida, H. somni

Associations between C/S results at time of BRD treatment given C/S results near arrival
Risk factor	Outcome	Significant risk factors for increasing risk**
C/S results at 1DOF	C/S results at BRD treatment ≤13DOF	Tetracycline resistance
C/S results at 1DOF	C/S results at BRD treatment ≤45DOF	None
C/S results at 13DOF	C/S results at BRD treatment >13DOF	P. multocida, any bacteria with AMR, macrolide, or tetracycline resistance

* Table 7, ** Tables 8, 9.