COVID-19(84) Abstract(41) SARS-CoV-2(36) ARDS(14) Patient(13) vaccination(13) variants.(12) Pneumonia(12) intensive care(12) variants(12) Efficacy(10) outcome(10) Respiratory failure(9) Treatment(9) Acute respiratory failure(9) variant(9) Mortality(8) mechanical ventilation(8) therapy(8) management(8) ICU(8) COVID-19 pandemic(8) Infection(7) Admission(7) was performed(7) France(7) Care(6) French(6) booster(6) COVID-19 vaccine(6)