Effectiveness of the 2023-to-2024 XBB.1.5 COVID-19 Vaccines Over Long-Term Follow-up: A Target Trial Emulation: Annals of Internal Medicine: Vol 0, No 0
“C-19 vaccines targeting the XBB.1.5 variant of Omicron were NOT effective in preventing infection and had relatively low VE against hospitalization and death, which declined rapidly over time."