Epidemiological Investigation and Phylogenetic Analysis of Bovine Respiratory Disease Complex in Northern China.

Statistical analyses (Section 2.5 ) revealed—Viral seasonality: significantly elevated detection rates in Q1 (72.85%, n = 965/1425) and Q4 (67.72%, n = 896/1230) ( χ 2 = 54.18, p < 0.001; Figure 7 ), the p ‐value analysis based on the chi‐square test yielded highly significant differences in infection rates of individual viruses between quarters; Annual dynamics: BVDV prevalence declined from 21.55% (2022) to 20.48% (2024) (ANOVA: F = 2.883, p = 0.1027), whereas BRSV increased from 2.63% to 10.3% ( F = 1.539, p = 0.2778) (Figure 8B ), according to a one‐way ANOVA, there

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