ABSTRACT
Background and aims: Little is known regarding the antibody responses of COVID-19 vaccination in patients with autoimmune liver diseases (AILD). We aim to evaluate the antibody responses and explore the impact of immunosuppressants on SARS-CoV-2 vaccines in AILD.Methods: We conducted a prospective observational study and included participants been healthy as controls and AILD. All adverse events (AEs) were recorded. IgG antibodies against the receptor-binding domain (RBD) of spike protein (anti-RBD-IgG) and Neutralizing antibodies (NAbs) were tested after the COVID-19 vaccination. In addition, SARS-CoV-2 specific B cells were detected by flow cytometry.Results: 76 patients and 136 healthy controls (HC) were included. All AEs were mild and self-limiting, and the incidences were similar between AILD and HC groups. The seropositivity rates of anti-RBD-IgG and NAbs in AILD were 97.4% (100% in HC, p = 0.13) and 63.2% (84.6% in HC, p < 0.001), respectively. The titers of anti-RBD-IgG and NAbs were significantly lower in AILD compared with HC. After adjusting for confounders, immunosuppressive therapy was an independent risk factor for the low-level anti-RBD-IgG (adjusted odds ratio [AOR]: 4.7; 95% confidence interval [CI], 1.5-15.2; p = 0.01) and reduced probability of NAbs seropositivity (AOR, 3.0; 95% CI, 1.0-8.9; p = 0.04) in AILD patients. However, regardless of immunosuppressants, the SARS-CoV-2 specific memory B cells responses were comparable between AILD and HC groups.Conclusion: SARS-CoV-2 inactivated vaccine is safe, but its immunogenicity is compromised in patients with AILD. Moreover, immunosuppressants are significantly associated with poor antibody responses to the SARS-CoV-2 vaccine.