Notably, despite no reduction in ARG2-enriched CXCR2Hi MDSCs numbers post-BEC, a substantial decrease in CD4+ T cell apoptosis was observed in BALF (7.7% vs. 13.5%, p = 0.046) and BM (23.46% vs. 51.93%, p = 0.017) on day 6 post-infection, effectively restoring CD4+ T cell proportions from 2.18% to 12.19% (p = 0.008) in BALF and from 4.42% to 11.07% (p = 0.016) in BM (Figure 5, D-F, and Figure S6, G and H). This evidence concerns the gene CD4 and infection.