MTX Hold During Covid-19 Booster

Inclusion Criteria: * Males or females ≥ 19 years of age at time of consent * Have a diagnosis of RA per ACR criteria * Require methotrexate for RA treatment * Subject to a Covid-19 booster vaccination * Must understand and voluntarily sign an informed consent form including writing consent for data protection Exclusion Criteria: * Pregnant or lactating females * Previous anaphylactic response to the vaccine components * Any other rheumatic disease such as systemic lupus erythematosus, mixed connective tissue disease, dermatomyositis/polymyositis, and vasculitis except for secondary Sjogren's disease * Any condition including laboratory abnormality which places the subject at unacceptable risk * Subjects who decline to participate