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Objective: To investigate the influence of COVID-19 vaccination on disease activity in rheumatoid arthritis (RA) and psoriatic arthritis (PsA) patients under targeted therapies., Patients and Methods: 1765 vaccinated patients COVID-19, 1178 (66.7%) with RA and 587 (33.3%) with PsA from the COVID-19 registry in patients with rheumatic diseases (COVIDSER) project, were included. Demographics, disease characteristics, Disease Activity Score in 28 joints (DAS28) and targeted treatments were collected. DAS28-based flare rates and categorised disease activity distribution prevaccination and post vaccination were analysed by log-linear regression and contingency analyses, respectively. The influence of vaccination on DAS28 variation as a continuous measure was evaluated using a random coefficient model., Results: The distribution of categorised disease activity and flare rates was not significantly modified by vaccination. Log-linear regression showed no significant changes in the rate of flares in the 6-month period after vaccination compared with the same period prior to vaccination in neither patients with RA nor patients with PsA. When DAS28 variations were analysed using random coefficient models, no significant variations in disease activity were detected after vaccination for both groups of patients. However, patients with RA treated with Janus kinase inhibitors (JAK-i) (1) and interleukin-6 inhibitor (IL-6-i) experienced a worsening of disease activity (1.436±0.531, p=0.007, and 1.201±0.550, p=0.029, respectively) in comparison with those treated with tumour necrosis factor inhibitor (TNF-i). Similarly, patients with PsA treated with interleukin-12/23 inhibitor (IL-12/23-i) showed a worsening of disease activity (4.476±1.906, p=0.019) compared with those treated with TNF-i., Conclusion: COVID-19 vaccination was not associated with increased rate of flares in patients with RA and PsA. However, a potential increase in disease activity in patients with RA treated with JAK-i and IL-6-i and in patients with PsA treated with IL-12/23-i warrants further investigation., Competing Interests: Competing interests: JMA-G declares consulting/lecture/speaker’s bureau fees from Abbvie, BMS, Galapagos, Lilly, MSD, Pfizer, Roche and UCB. FD-G reports the following conflicts of interest for payment or honoraria for lectures, presentations, speakers’ bureaus for Lilly, Pfizer, UCB and Novartis; payment for expert testimony for Abbvie, Roche and MSD; support for attending meetings for Pfizer; and participation on advisory board for Gilead and receipt of equipment from Abbvie., (© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY. Published by BMJ.)

Objectives: To analyse the effect of targeted therapies, either biological (b) disease-modifying antirheumatic drugs (DMARDs), targeted synthetic (ts) DMARDs and other factors (demographics, comorbidities or COVID-19 symptoms) on the risk of COVID-19 related hospitalisation in patients with inflammatory rheumatic diseases., Methods: The COVIDSER study is an observational cohort including 7782 patients with inflammatory rheumatic diseases. Multivariable logistic regression was used to estimate ORs and 95% CIs of hospitalisation. Antirheumatic medication taken immediately prior to infection, demographic characteristics, rheumatic disease diagnosis, comorbidities and COVID-19 symptoms were analysed., Results: A total of 426 cases of symptomatic COVID-19 from 1 March 2020 to 13 April 2021 were included in the analyses: 106 (24.9%) were hospitalised and 19 (4.4%) died. In multivariate-adjusted models, bDMARDs and tsDMARDs in combination were not associated with hospitalisation compared with conventional synthetic DMARDs (OR 0.55, 95% CI 0.24 to 1.25 of b/tsDMARDs, p=0.15). Tumour necrosis factor inhibitors (TNF-i) were associated with a reduced likelihood of hospitalisation (OR 0.32, 95% CI 0.12 to 0.82, p=0.018), whereas rituximab showed a tendency to an increased risk of hospitalisation (OR 4.85, 95% CI 0.86 to 27.2). Glucocorticoid use was not associated with hospitalisation (OR 1.69, 95% CI 0.81 to 3.55). A mix of sociodemographic factors, comorbidities and COVID-19 symptoms contribute to patients' hospitalisation., Conclusions: The use of targeted therapies as a group is not associated with COVID-19 severity, except for rituximab, which shows a trend towards an increased risk of hospitalisation, while TNF-i was associated with decreased odds of hospitalisation in patients with rheumatic disease. Other factors like age, male gender, comorbidities and COVID-19 symptoms do play a role., Competing Interests: Competing interests: LL-V declares the following conflicts of interest for payment or honoraria for lectures, speakers’ bureaus for Lilly. JMAG declares consulting/lecture/speaker’s bureau fees from Abbvie, BMS, Galapagos, Lilly, MSD, Pfizer, Roche and UCB. JMP-R reports the following conflicts of interest for payment or honoraria for lectures, presentations, speakers’ bureaus, manuscript writing or educational events from Janssen and Roche. MAG-G received grants/research support from AbbVie, MSD, Janssen and Roche and had consultation fees/participation in company sponsored speaker's bureau from AbbVie, Pfizer, Roche, Celgene, MSD, Novartis, SOBI and Sanofi. FD-G reports the following conflicts of interest for payment or honoraria for lectures, presentations, speakers’ bureaus for Lilly, Pfizer, UCB and Novartis; payment for expert testimony for Abbvie, Roche and MSD; support for attending meetings for Pfizer; participation on advisory board for Gilead and Receipt of equipment Abbvie. CE declares support for attending meetings and/or travel from Pfizer and UCB. PV reports receiving consulting fees from Lilly, Novartis and Fresenius Kabi; payment or honoraria for lectures, presentations, speakers’ bureaus, manuscript writing or educational events from Sandoz, BMS, GSK, Sanofi and Roche; support for attending meetings and/or travel from Abbvie, Pfizer and Roche and grants or contracts from any entity for her hospital from Abbvie, Roche and MSD. JM-B reports the following conflicts of interest for payment or honoraria for lectures, presentations, speakers’ bureaus for UCB, GSK, Lilly and Novartis; support for attending meetings for UCB, GSK and Pfizer; participation on advisory board for UCB and GSK. MG declares the following conflicts of interest for payment or honoraria for lectures, presentations, speakers’ bureaus for UCB, GSK, Lilly and Abbvie; payment for expert testimony for GSK and participation on advisory board for GSK, Abbvie and UCB., (© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)