$IBRX IBRX booster. I believe! Dr. Fauci on delta variant, risks to children, breakthrough COVID and booster shots Jul 19, 2021 6:55 PM EDT Dr. Anthony Fauci: That is correct, Judy. And those data are being collected right now. We're doing studies to look at the effective boosters, how high you can get the response up, particularly in those people, like transplant patients, who are on immunosuppressive regimens, people with underlying disease that require medication that might suppress their immune system.