JAMA Case challenge: 61yoM with seronegative RA x yrs (rx w/ MTX and biologics) develops intermittent fever (38C), asymmetric polyarthralgias, & 50 lb Weight Loss, CRP 7.7mg/L. No response to TCZ and developed diarrhea. What do you do next? https://t.co/QkGca1qp9r