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Number of P. multocida and M. haemolytica isolates with different MIC values by treatment group and sampling occasion. Sa1 (saline, arrival), Tu1 (tulathromycin, arrival), Sa2 (saline, follow-up), Tu2 (tulathromycin, follow-up). Only one isolate was included from each calf unless duplicate isolates from the same calf had different MIC values. Horizontal lines indicate susceptibility breakpoints established by the Clinical Laboratory and Standards Institute (CLSI).
