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. 2021 Jul 1;8:692646. doi: 10.3389/fvets.2021.692646

Figure 4.

Figure 4

Proportion of deep nasopharyngeal swabs that were positive for BRD-related bacteria and Mannheimia haemolytica serotype proportions recovered from beef and dairy-type cattle upon feedlot arrival. These percentages represent unadjusted proportions. The asterisks represent the statistical test significance levels as follows: “*” 0.05, “***” 0.001. BRD, bovine respiratory disease; Hs, Histophilus somni; Mb, Mycoplasma bovis; Mh, Mannheimia haemolytica; Pm, Pasteurella multocida. (A) Beef Mh positive proportion: 283/2,055; beef Pm positive proportion: 703/2,055; beef Hs positive proportion: 68/2,055; beef Mb positive proportion: 257/2,055; dairy Mh positive proportion: 209/769; dairy Pm positive proportion: 463/769; dairy Hs positive proportion: 173/769; dairy Mb positive proportion: 198/769. Mh X2 (1, n = 2,824) = 69.91, p < 0.001; Pm X2 (1, n = 2,824) = 156.04, p < 0.001; Hs X2 (1, n = 2,824) = 263.94, p < 0.001; Mb X2 (1, n = 2,824) = 72.60, p < 0.001. (B) Beef Mh A1 positive proportion: 57/283; beef Mh A6 positive proportion: 45/283; beef Mh A2 positive proportion: 178/283; beef Mh unknown positive proportion: 3/283; dairy Mh A1 positive proportion: 59/209; dairy Mh A6 positive proportion: 32/209; dairy Mh A2 positive proportion: 99/209; dairy Mh unknown positive proportion: 19/209. Mh A1 X2 (1, n = 492) = 4.36, p = 0.0367; Mh A6 X2 (1, n = 492) = 0.03, p = 0.8587; Mh A2 X2 (1, n = 492) = 11.78, p < 0.001; Mh unknown Fisher Exact (1, n = 492) = 18.15, p < 0.001.