The Natural History of Covid-19 in Vaccinated Inflammatory Bowel Disease Patients

ABSTRACT

Introduction: Patients with Inflammatory Bowel Disease (IBD), especially those on immunosuppressives (IMS), should be vaccinated against SARSCoV- 2 to prevent hospitalization, mechanical ventilation, and death. However, IMS may adversely affect response to vaccination, raising concerns as to how vulnerable these patients are to break through COVID-19 infections. Thus, we aimed to assess the proportion of IBD patients who despite complete vaccination developed COVID-19, as well as the course of COVID-19 disease. Aims & Methods: This study was an initiative of the Hellenic IBD Study Group (EOMIFNE) and involved 12 IBD referral Centers. Patients attending these Centers who reported a COVID-19 infection at least 3 weeks after vaccination completion were asked to complete an on-line anonymous questionnaire which included patient demographics and IBD clinical and therapeutic data, a detailed vaccination history, and the course and outcome of COVID-19, especially the need for hospitalization, oxygen supply, and admission to ICU. In patients with a grave outcome information was sought by family members. Result(s) On estimate, 3240 patients reported full vaccination (vaccination scheme either with combined Vaxzevria- Comirnaty or onlyComirnaty vaccine) in the 12 centers. Between 1stMay 2021 and 20thApril 2022,351 (10.8%) fully vaccinated IBD patients reported COVID-19 infection [187 male, 212 CD, 139 UC, mean (SD) age 42.3 (14.9) years, mean (SD) IBD duration mean (SD), 10.1 (9.7) years]. Among them, 322 (91.7%) were infected once and 29 (8.3%) patients twice. Seventy-three patients were receiving 5-ASAs, 15 corticosteroids, 46 azathioprine/methotrexate, 117 anti-TNFs as monotherapy and 21 in combination with azathioprine/methotrexate, and 2 with corticosteroids, 43 vedolizumab, 25 ustekinumab, 5 tofacitinib and 1 rizakinzumab at the time of COVID-19 diagnosis. Three patients did not receive any treatment. IBD was in remission in 279/351 patients (79.5%). Comorbidities were reported by 112 patients (thyroid disease 66;diabetes mellitus 13;hypertension 12;coronary heart disease 11;prior cancer 4;psoriasis 2;spondyoartropathy 2;dyslipidemia 1;and PSC 1 patient). The mean (SD) time between last vaccination dose and infection was 4.1 (1.6) months. Overall, 308 (87.7%) patients reported mild constitutional and respiratory symptoms, 29 (8.6%) were asymptomatic and only 14 patients (3.9%) required hospitalization. Of those hospitalized, 2 patients, both with UC, died because of COVID pneumonia (one aged 67, on infliximab, with diabetes and the second one aged 80, on 5-ASA, with a history of laryngeal cancer);however, the remaining 12 patients did not need high flow oxygen supply or ICU admission, and none reported symptoms of long COVID. IBD medications were stopped in 145 patients (41.3%) during the COVID-19 infection. Conclusion(s) A minority of fully vaccinated IBD vaccinated patients developed COVID-19 which was relatively mild and uneventful. These results reinforce the importance of vaccination especially in vulnerable populations.