COVID-19(5) Hospitalization(5) Lineage(3) England(3) B.1(3) white(3) were infected(3) affecting(3) outcome(3) clinical(3) with COVID-19(3) women(3) intensive care unit admission(3) Factor(3) veteran(3) required(3) Epidemiology(3) Cohort(3) demographic factor(3) viral genomes(3) Admission(3) Healthcare system(3) increasing age(3) sequenced(3) vaccination(3) the mean(3) clinical outcomes(3) male(3) veterans(3) Analysis(3)