Competitive indices (CI) of ΔmsrC and ΔmsrBΔmsrC versus wild type on day 3 post infection.

*P-values were calculated using the Wilcoxon Signed Rank Test to test whether the actual median differs significantly from 1 (theoretical median). CIs are shown as medians ± standard deviation.本研究采用威尔科克森符号秩检验（Wilcoxon Signed Rank Test）计算P值，以检验实际中位数与理论中位数1是否存在显著差异。置信区间（Confidence Intervals，CI）以中位数±标准差的形式呈现。