Background Few reports have evaluated the effect of the SARS-CoV-2 variant and
vaccination on the clinical and imaging features of COVID-19. Purpose To evaluate and …

Background Differences in the clinical and radiologic characteristics of SARS-CoV-2
Omicron subvariants have not been well studied. Purpose To compare clinical disease …

Objectives: To compare the clinical characteristics and chest CT findings of patients infected
with Omicron and Delta variants and the original strain of COVID-19. Methods: A total of 503 …

Background The SARS-Cov-2 Omicron variant demonstrates rapid spread but reduced
disease severity. Studies evaluating lung imaging findings of Omicron infection versus non …

Background Since vaccines against COVID-19 became available, rare breakthrough
infections have been reported despite their high efficacies. Purpose To evaluate the clinical …

Rationale and Objectives The Omicron variant of COVID-19 is less severe than the ancestral
strain, leading to the potential for deaths in patients infected with the virus but who die of …

Background: The impact of SARS-CoV-2 variants of concern (VOCs) on disease severity is
unclear. In this retrospective cohort study, we compared outcomes of patients infected with …

Background CT manifestations of SARS-CoV-2 may differ among variants. Purpose To
compare the chest CT findings of SARS-CoV-2 between the Delta and Omicron variants …

Background The genetic and pathogenic characteristics of SARS-CoV-2 have evolved from
the original isolated strains; however, the changes in viral virulence have not been fully …

Background Four severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants
predominated in the United States since 2021. Understanding disease severity related to …