Effectiveness of a fourth mRNA dose among individuals with systemic autoimmune rheumatic diseases during the Omicron era

Affiliations

• ¹ Holland Bone & Joint Program, Sunnybrook Research Institute, Toronto, ON M4N3M5, Canada; ICES, Toronto, ON, Canada; Institute of Health Policy, Management & Evaluation, Department of Paediatrics, University of Toronto, Toronto, ON, Canada. Electronic address: jessica.widdifield@utoronto.ca.
• ² ICES, Toronto, ON, Canada; Division of Rheumatology, Department of Paediatrics, University of Toronto, Toronto, ON, Canada.
• ³ Divisions of Rheumatology and Clinical Epidemiology, Department of Medicine, McGill University Health Centre, Montreal, Quebec, Canada.