Andy 0963 #ACR21 @RheumNow covid19 vaccine immunogenicity in rheum pts overall good at 71%, fairly dependent on Rx choice: rituximab 38% after 1g & only 7 % after 1gx2; abatacept IV 45%. Rest biologics >80%, ⬇️MTX &MMF. Low dose prednisone w/out biologics did not affect Ab+ rates https://t.co/TkCC1sgMHG