👉29% of pts on RTX fail to mount a humoral OR cellular response to #COVIDvaccine & have⬆️hosp,⬆️hosp stay,⬆️severity, persistent viremia,⬆️deaths) 👉study adding booster (AZ or mRNA) overcomes this, enhancing humoral and cellular response #ACR21 @rheumnow Abst#L17 https://t.co/yuX1TT6ZBF