907: COVID-19 VACCINE PROTECTION AGAINST MORTALITY IN PATIENTS WITH OXYGEN: A MULTICONTINENTAL STUDY. (15th December 2022) - Huespe, Ivan; Pollan, Javier; Khalid, Aisha; Ferraris, Augusto; Blanco, Antonio; Gómez-Huelgas, Ricardo; Miguel, Anton Santos Juan; Nuñes-Cortes, Jesus Millan; Lumbreras, Carlos; Rincon, Jose Manuel Ramos; Barrio, Noelia Garcia; Casas-Rojo, Jose Manuel; et al.