News Release

Study finds COVID-19 vaccine not associated with severe disease flare in patients with rheumatic diseases

Reports and Proceedings

American College of Rheumatology

ATLANTA — New research presented this week at ACR Convergence, the American College of Rheumatology’s annual meeting, shows that the COVID-19 vaccine was not associated with severe disease flares in patients with rheumatic diseases. Medications to treat rheumatic diseases were associated with a reduction in vaccine-induced antibody responses. (Abstract #L02).

During the clinical trials for the COVID-19 vaccines, individuals with an immunocompromised condition and/or a history of autoimmune disease were excluded. This left patients concerned about the safety and immunogenicity of the vaccines once they were widely available. Researchers set to find out how safe the vaccines were for patients with rheumatic diseases.

“This study was proposed a year ago when there was essentially no information about the safety and immunogenicity of COVID-19 vaccines in people living with rheumatic diseases. We presented the study proposal to our provincial Government as a 'priority',” said Dr. Inés Colmegna, MD, Associate Professor at McGill University’s Department of Medicine – Rheumatology in Montreal, QC and the study’s co-author. “Historically, some groups of patients with rheumatic diseases had reduced immunogenicity to other vaccines. In addition, case reports indicated a risk of viral mutations in severely immunosuppressed hosts.”

To find out more about the safety and immunogenicity of the vaccines in patients with rheumatic diseases, researchers conducted a prospective, non-randomized, open label, comparative clinical trial at two academic centers in Quebec, Canada. Trial participants were adults with one of the following diagnoses: seropositive rheumatoid arthritis (RA) on stable treatment for more than three months, systemic lupus erythematosus (SLE) on stable treatment with mycophenolate mofetil (MMF), patients with another rheumatic disease receiving greater than 10 mg of prednisone per day, or age/sex matched adults without rheumatic diseases (the control group).

Two hundred twenty participants were enrolled in the study. One hundred thirty-one patients with RA, 23 with SLE, 8 with another rheumatic diseases, and 58 controls. The average age was 60.4 and 72% of the participants were female.

The primary outcomes of the study were the frequency of pre-specified (i.e., solicited) local and systemic adverse events in the seven days after each vaccine dose and any other (i.e., unsolicited) adverse events (including disease flares) in the 28 days following each dose. The study sought to determine the safety profile of the mRNA-COVID-19 vaccine from Moderna in young and elderly patients with RA on different treatments, SLE patients on MMF, and people with any rheumatic disease requiring high doses of steroids. In addition, it evaluated the proportion of those patients that developed vaccine-induced antibodies compared to a control group without rheumatic diseases.

Local and systemic solicited adverse events were more frequently reported after the second dose of the vaccine with pain in the injection site being the most common. Swollen joints (a solicited adverse event) following both doses of the vaccine were more frequently reported by the RA patients than the control group. There was no increase in disease activity post-vaccination. No serious adverse events were attributed to the vaccine.

After the first dose, positivity for the SARS-CoV-2 spike protein and its’ receptor binding domain was 100% in the control group, but only 67.7% in the patients with RA, 34.8% in the patients with SLE, and 87.5% in the patients with other rheumatic diseases. After the second dose, positivity for the SARS-CoV-2 spike protein and its’ receptor binding domain remained at 100% in the control group, but only 88.5% in the patients with RA, 78.3% in the patients with SLE, and 87.5% in the patients with other rheumatic diseases. Positivity after the second doses in RA patients who are 65 years or older versus patients who are younger was similar. After the two vaccine doses, people taking rituximab or mycophenolate mofetil (MMF) had lower humoral responses than patients who are not taking those drugs. These results indicate that most rheumatology patients included in this study had good vaccine responses following two doses of a mRNA-vaccine with the exception of two groups: RA patients on rituximab and SLE patients on MMF. In these two groups, additional strategies to enhance vaccine responses need to be tested.

This study, entirely funded by the Government of Quebec, is still ongoing. The study’s authors say antibody responses will be assessed at 6 months post vaccination as well as after a 3rd dose of a vaccine. In addition, cellular responses will be evaluated.

“These findings help to reassure patients with rheumatic diseases and their providers who are concerned that COVID-19 vaccines could lead to an increase in disease activity,” said Dr. Colmegna. “It highlights the importance of having a complete vaccine scheme in order to enhance vaccine responses. It confirms reduced immunogenicity in patients on drugs that affect B cell function, emphasizing the importance of the Cocoon Strategy (vaccinating those in close contact with these vulnerable patients) and other measures to prevent infection.”


About ACR Convergence

ACR Convergence, the annual meeting of the American College of Rheumatology, is where rheumatology meets to collaborate, celebrate, congregate, and learn. With more than 320 sessions and thousands of abstracts, it offers a superior combination of basic science, clinical science, business education and interactive discussions to improve patient care. For more information about the meeting, visit, or join the conversation on Twitter by following the official hashtag (#ACR21).

About the American College of Rheumatology

Founded in 1934, the American College of Rheumatology (ACR) is a not-for-profit, professional association committed to advancing the specialty of rheumatology that serves over 7,700 physicians, health professionals, and scientists worldwide. In doing so, the ACR offers
education, research, advocacy and practice management support to help its members continue their innovative work and provide quality patient care. Rheumatology professionals are experts in the diagnosis, management and treatment of more than 100 different types of arthritis and rheumatic diseases. For more information, visit

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