#ACR21 #Abstr0437 OK, so RTX affects #COVID vaccine but some pts need RTX. Factors predicting response to vaccine: RA vs AAV/IIM Higher IgG Longer time-to-RTX Lower RTX courses Number. Prediction Calculator is developed but need ext. validation #RheumNow https://t.co/iXSaGQ76hS https://t.co/WQAV3GRPBz