PSMD1 and systemic lupus erythematosus: The level of anti-S1/RBD protein IgG antibodies in patients with AIIRD (median [IQR], 8.8 [2.2–17.3] S/CO) and SLE (median [IQR], 9.6[2.4–20.4] S/CO) was comparable to that in the control group (median [IQR], 7.2 [3.1–14.2] S/CO), p > 0.05 (Table 1).The scatter plots of antibody levels in the control group and patients with AIIRD according to the antibody detection time after the second dose of vaccine are shown in Fig. 1.