Korean Insurance claims nested case–control study of 27,410 RA pts - 5482 w/ > comorbid Dsx Vs 21,928 w/ < 10 comorbd Dz. Having >10 signif incr Serious infx (OR 1.44), opportunistic (21.9)& Hzoster (1.18); mainly skin & soft tissue infx - NOT fatal infx. https://t.co/qDrU3BXYzd