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A bacterial driver of arthritis?

Autoantibodies are detected in people at risk for rheumatoid arthritis before development of clinical disease. The source of these autoantibodies is unclear.

“A bacterial strain from the Subdoligranulum genus associated with autoantibody development was identified. Mice colonized with this Subdoligranulum isolate developed arthritis…”

https://www.science.org/doi/10.1126/scitranslmed.abn5166