ABSTRACT
Background: Bulgaria is among the countries with the lowest vaccination rate of adult population in Europe. The presence of autoimmune rheumatic disease could further contribute to vaccine hesitancy and skepticism and influence patients' attitudes towards vaccination [1, 2]. However, little is still known about the willingness and particular causes of hesitancy in patients with infammatory joint diseases in the skeptical part of adult population across Europe. Objectives: Our goal was to assess the rate of SARS-CoV-2 vaccination among patients with immune-mediated rheumatic joint diseases receiving biological and targeted synthetic disease-modifying antirheumatic drugs (DMARDs) and to determine the modifable predictors of vaccination hesitancy. Methods: Patients with rheumatoid arthritis, psoriatic arthritis, or ankylosing spondylitis undergoing biological or targeted synthetic DMARDs therapy were consecutively selected and included in this single-center cross-sectional study. Excluding criteria in patients were psychiatric or neurological disease preventing understanding or responding to the questions, being illiterate, or not willing to participate in the study. Various demographic, anthropometric, and clinical data were collected. Disease activity was determined using DAS28-CRP for rheumatoid arthritis and peripheral psoriatic arthritis and ASDAS for ankylosing spondy-litis and psoriatic spondylitis. All patients were given a questionnaire assessing their vaccination status, hesitancy, and attitude towards vaccination. Binary logistic regression analysis was used to analyze the relationship between self-reported modifable parameters and vaccination status for SARS-CoV-2. Results: Two hundred and one participants were eligible for participating in the study with mean age and BMI of 54.6 years and 28.2, respectively. Of these, 40.3% were women;30.3% had rheumatoid arthritis, 17.9%-psoriatic arthritis, and 51.7%-ankylosing spondylitis. 29.4 % of all participants had already survived a COVID-19 infection with a mean time of 8.4 months since the COVID-19 onset. Only slightly above 1/3 (35.8%) of the study group was fully vaccinated and the majority of them were vaccinated with BNT162b2 (68.1%). Among the modifable factors, we identifed preceding discussion with a rheumatologist, hesitancy due to autoimmune disease presence and (un)awareness of vaccine safety and efficacy as signifcant predictors of vaccination status Conclusion: Our data suggest that there are still possibilities to influence rheumatic patients on their decision to vaccinate against SARS-CoV-2 in Bulgaria. Raising the awareness of the safety and efficacy of the SARS-CoV-2 vaccines and spending more time on the education of patients with rheumatic diseases may positively affect their attitude towards vaccination.