highly significantp = 0.001
Notably, non-responding LTRs had markedly lower antibody levels compared to responding LTRs, with highly significant differences observed for both Wuhan anti-S and anti-Omicron IgG (128.2 BAU/mL vs. 1161 BAU/mL, p = 0.001, and 6.7 AU/mL vs. 144 AU/mL, p = 0.001, respectively).