RT Journal Article SR Electronic T1 Inflammatory rheumatic diseases with onset after SARS-CoV-2 infection or COVID-19 vaccination: a report of 267 cases from the COVID-19 and ASD group JF RMD Open JO RMD Open FD EULAR SP e003022 DO 10.1136/rmdopen-2023-003022 VO 9 IS 2 A1 Francesco Ursini A1 Piero Ruscitti A1 Olga Addimanda A1 Rosario Foti A1 Vincenzo Raimondo A1 Giuseppe Murdaca A1 Virginia Caira A1 Erika Pigatto A1 Giovanna Cuomo A1 Alberto Lo Gullo A1 Ilaria Cavazzana A1 Corrado Campochiaro A1 Caterina Naclerio A1 Rossella De Angelis A1 Jacopo Ciaffi A1 Luana Mancarella A1 Veronica Brusi A1 Elena Marchetti A1 Francesca Motta A1 Marcella Visentini A1 Sebastiano Lorusso A1 Maria De Santis A1 Giacomo De Luca A1 Laura Massaro A1 Domenico Olivo A1 Roberta Pellegrini A1 Francesca Francioso A1 Jessica Luppino A1 Ilenia Di Cola A1 Roberta Foti A1 Giuseppe Varcasia A1 Francesco Caso A1 Massimo Reta A1 Lorenzo Dagna A1 Carlo Selmi A1 Annamaria Iagnocco A1 Roberto Giacomelli A1 Florenzo Iannone A1 Clodoveo Ferri YR 2023 UL http://rmdopen.bmj.com/content/9/2/e003022.abstract AB Objectives To better define the spectrum of new-onset post-COVID-19 and post-COVID-19 vaccine inflammatory rheumatic diseases (IRD) from a large multicentric observational study.Methods Consecutive cases of IRD encountered during a 12-month period and satisfying one of the following inclusion criteria: (a) onset of the rheumatic manifestations within 4 weeks from SARS-CoV-2 infection or (b) onset of the rheumatic manifestations within 4 weeks from the administration of one of the COVID-19 vaccines ws recruited.Results The final analysis cohort comprised 267 patients, of which 122 (45.2%) in the post-COVID-19 and 145 (54.8%) in the postvaccine cohort. Distribution of IRD categories differed between the two cohorts: the post-COVID-19 cohort had a higher percentage of patients classified as having inflammatory joint diseases (IJD, 52.5% vs 37.2%, p=0.013) while the post-vaccine cohort had a higher prevalence of patients classified as polymyalgia rheumatica (PMR, 33.1% vs 21.3%, p=0.032). No differences were detected in the percentage of patients diagnosed with connective tissue diseases (CTD 19.7% vs 20.7%, p=0.837) or vasculitis (6.6% vs 9.0%, p=0.467). Despite the short follow-up period, IJD and PMR patients’ response to first-line therapy was favourable, with both groups achieving a drop in baseline disease activity scores of ~30% and ~70% respectively.Conclusion Our article reports the largest cohort published to date of new-onset IRD following SARS-CoV-2 infection or COVID-19 vaccines. Although causality cannot be ascertained, the spectrum of possible clinical manifestations is broad and includes IJD, PMR, CTD and vasculitis.Data are available upon reasonable request.