Reduced Humoral Response to Two Doses of Covid-19 Vaccine in Patients with Inflammatory Bowel Disease: Data from Escape-Ibd, an Ig-Ibd Study

ABSTRACT

Introduction: Patients on immunosuppressive drugs have been excluded from COVID-19 vaccines trials, creating concerns regarding their efficacy in this setting. Aims & Methods: Effectiveness and Safety of COVID-19 Vaccine in Patients with Inflammatory Bowel Disease (IBD) Treated with Immunomodulatory or Biological Drugs (ESCAPE-IBD) is a prospective, multicentre study promoted by the Italian Group for the study of Inflammatory Bowel Disease. We present data on serological response eight weeks after the second dose of COVID-19 vaccination in IBD patients and healthy controls (HCs). Result(s) 1076 patients with IBD and 1126 HCs were analyzed. Seropositivity for anti-SARS-CoV-2 IgG was reported for most IBD patients, even if with a lesser rate compared with HCs (92.1% vs. 97.9%;p<0.001). HCs had higher antibody concentrations (median OD 8.72 [IQR 5.2-14-2]) compared to the whole cohort of IBD patients (median OD 1.54 [IQR 0.8-3.6];p<0.001) and the subgroup of IBD patients (n=280) without any treatment or on aminosalicylates only (median OD 1.72 [IQR 1.0-4.1];p<0.001). IBD patients treated with anti-TNFs showed significantly lower median anti-SARS-CoV-2 IgG levels compared with those without any treatment or on aminosalicylates only (OD 1.30 [IQR 0.7-3.0] vs.1.72 [IQR 1.0-4.1];p<0.001), those treated with Vedolizumab (OD 1.78 [IQR 1.1-4.1];p=0.001), and Ustekinumab (OD 1.71 [IQR 0.9-4.9];p=0.03). Conclusion(s) Although most IBD patients showed seropositivity after two doses of COVID-19 vaccines, the magnitude of the humoral response was significantly lower than in HCs. Differently from other studies, these findings seem to be mostly unrelated to the use of immune-modifying treatments. Regarding COVID-19 vaccination, patients with IBD should be regarded as a whole as a "frail" category, therefore requiring booster/additional doses of COVID-19 vaccine.