USA EMR (N3C) Data on 577,335 Rheum Pts w/18,164 #COVID19 breakthrough infx (BTI) 👉91% vax'd 👉3.1% w/BTI 👉86% were vax'd May 2021 or earlier 👉More BTI w/Pfizer 👉BTI higher in inflamm myositis, RA 👉Drugs assc w/BTI: biologics, mult DMARDs #ACR21 @rheumnow Abst#L16 #ACRbest https://t.co/Eu77vAAk3N