biostudies-literatureUnknown175(6)Bouzid D<h4>Background</h4>At the end of 2021, the B.1.1.529 SARS-CoV-2 variant (Omicron) wave superseded the B.1.617.2 variant (Delta) wave.<h4>Objective</h4>To compare baseline characteristics and in-hospital outcomes of patients with SARS-CoV-2 infection with the Delta variant versus the Omicron variant in the emergency department (ED).<h4>Design</h4>Retrospective chart reviews.<h4>Setting</h4>13 adult EDs in academic hospitals in the Paris area from 29 November 2021 to 10 January 2022.<h4>Patients</h4>Patients with a positive reverse transcriptase polymerase chain reaction (RT-PCR) test result for SARS-CoV-2 and variant identification.<h4>Measurements</h4>Main outcome measures were baseline clinical and biological characteristics at ED presentation, intensive care unit (ICU) admission, mechaniAnnals of internal medicine831-837https://www.ebi.ac.uk/biostudies/studies/S-EPMC8941485biostudies-literatureComparison of Patients Infected With Delta Versus Omicron COVID-19 Variants Presenting to Paris Emergency Departments : A Retrospective Cohort Study.PMC8941485Javaud NIMProving Emergency Care (IMPEC) FHU Collaborators GroupFemy FHermand CMeritet JFBeaune SSimon TVeyer DMorel TJacquier HPeyrony OGindre FFreund YCachanado MVaittinada Ayar PRousseau ABouzid DAugustin CPavlovsky TBloom BRiou BKassasseya CGoulet HLe Goff JSchnuriger AIng VVieux TYordanov YBerard LAloui KChauvin ABourg AFerre VMarot STruchot JHouhou-Fidouh NKhellaf MSaib MDaoud AFourati SChoquet CChocron RVisseaux BEyer XSalmona MCahen SLandraud LRozenberg FCoulomb AfalseComparison of Patients Infected With Delta Versus Omicron COVID-19 Variants Presenting to Paris Emergency Departments : A Retrospective Cohort Study.<h4>Background</h4>At the end of 2021, the B.1.1.529 SARS-CoV-2 variant (Omicron) wave superseded the B.1.617.2 variant (Delta) wave.<h4>Objective</h4>To compare baseline characteristics and in-hospital outcomes of patients with SARS-CoV-2 infection with the Delta variant versus the Omicron variant in the emergency department (ED).<h4>Design</h4>Retrospective chart reviews.<h4>Setting</h4>13 adult EDs in academic hospitals in the Paris area from 29 November 2021 to 10 January 2022.<h4>Patients</h4>Patients with a positive reverse transcriptase polymerase chain reaction (RT-PCR) test result for SARS-CoV-2 and variant identification.<h4>Measurements</h4>Main outcome measures were baseline clinical and biological characteristics at ED presentation, intensive care unit (ICU) admission, mechani2022-01-01T00:00:00Z2022 Jun2025-04-19T22:12:42.911Z2025-04-19T22:12:42.911ZS-EPMC89414853528614710.7326/M22-0308