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Antimicrobial resistance gene pattern of isolated MH, faceted by TxGroup and sampling time. Numbers indicate total number of isolates with that resistance pattern. (a) aph(3′), (b) aph(6′), (c) blaROB, (d) blaOXA, (e) erm(42), (f) msr(E), (g) floR, (h) tetH, and (i) tetR. MH, Mannheimia haemolytica; TxGroup, treatment group; MDR, multidrug resistant; META, tulathromycin metaphylaxis; NO META, no tulathromycin metaphylaxis; TRT, treated; NO TRT, not treated.
