What to do w Rituximab users and #COVID19 vaccine? #Rituximab no seroconversion 30% with 2 #COVIDVaccination. With 3rd vaccine dose up to 94% can have immune response! Pts need their 3rd vaccination @RheumNow #ACR21 #ACRBest abstL17 https://t.co/0GHOuoqPKQ