{Reference Type}: Journal Article {Title}: Rapid Wane and Recovery of XBB Sublineage Neutralization After Sequential Omicron-based Vaccination in Solid Organ Transplant Recipients. {Author}: Johnston TS;Hage C;Abedon AT;Panda S;Alejo JL;Eby Y;Segev DL;Tobian AAR;Cox AL;Werbel WA;Karaba AH; {Journal}: Clin Infect Dis {Volume}: 0 {Issue}: 0 {Year}: 2024 Jul 2 {Factor}: 20.999 {DOI}: 10.1093/cid/ciae279 {Abstract}: Durability of variant neutralization in solid organ transplant recipients following Omicron-containing boosters is unknown. We report wane in XBB.1.5 neutralization by 3 months following a first bivalent booster, improved by a second booster; hybrid immunity improved peak, and duration of neutralization. Boosting at 3 to 6 months appears necessary to maintain neutralization.