SynthesisJournal of cellular and molecular medicine2023
Severity of the Omicron SARS-CoV-2 variant compared with the previous lineages: A systematic review.
Synthesis in Journal of cellular and molecular medicine, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 59 papers, 6 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
59 citing papers in PubMed, 6 syntheses or guidelines pooled it.
- Severity of COVID-19 Omicron Variants: A Global Systematic Review.Infectious diseases and therapy · 2026Pooled it
- New onset of type 1 and type 2 diabetes post-COVID-19 infection: a systematic review.Emerging microbes & infections · 2025Pooled it
- The impact of SARS-CoV-2 VOCs on clinical outcomes: an overview of reviews.Frontiers in medicine · 2025Pooled it
- The relative prevalence of the Omicron variant within SARS-CoV-2 infected cohorts in different countries: A systematic review.Human vaccines & immunotherapeutics · 2023Pooled it
- Role of previous infection with SARS-CoV-2 in protecting against omicron reinfections and severe complications of COVID-19 compared to pre-omicron variants: a systematic review.BMC infectious diseases · 2023Pooled it
- Severity of the Omicron SARS-CoV-2 variant compared with the previous lineages: A systematic review.Journal of cellular and molecular medicine · 2023Pooled it
- Phase I study, and dosing regimen selection for a pivotal COVID-19 trial of GST-HG171.Antimicrobial agents and chemotherapy · 2024Trial
- Associations of Pre-Pandemic CKD With Acute and Post-Acute COVID-19: The C4R Study.American journal of kidney diseases : the official journal of the National Kidney Foundation · 2026Article
- Combinatorial analysis of clinical and genomic data used to assess the association between SARS-CoV-2 mutations and disease severity.PNAS nexus · 2026Article
- SARS-CoV-2 seroprevalence among pregnant women during the first three waves of the COVID-19 pandemic in southern Mozambique.BMC pregnancy and childbirth · 2026Observational
- Article
- Impact of local COVID-19 incidence on health care personnel risk perception and social activity.American journal of infection control · 2026Article
- Long-term effects on physical and mental health and work ability after COVID-19 versus other upper respiratory infections.BMC public health · 2026Article
- The genomic diversity of SARS-CoV-2 Omicron lineages collected during routine sentinel surveillance in Tanzania between November 2022 and July 2023.BMC genomics · 2026Article
- COVID-19-related inflammation of the placenta impedes fetal development in pregnant hamsters.Nature communications · 2026Article
- Racial and Ethnic Differences in COVID-19 Disease Severity Among US Adults in Health Systems Participating in PCORnet®: May 2020-October 2022.Medical care · 2026Article
- Genomic and clinical epidemiology of SARS-CoV-2 in Lebanon: a prospective multicenter study 2020-2024.BMC infectious diseases · 2026Article
- Does asthma treatment influence COVID-19 severity? A comparative cohort study of SMART vs. Traditional therapy.European clinical respiratory journal · 2026Article
- SARS-CoV-2 Infection With Alpha B.1.1.7 Virus Induced Higher Antibody Responses Than Earlier Non-VOC Variants During the First Waves of the COVID-19 Pandemic in Norway.APMIS : acta pathologica, microbiologica, et immunologica Scandinavica · 2025Article
- Impact of COVID-19 after lung transplantation: A retrospective multicenter comparison of clinical outcomes in Denmark and Sweden.JHLT open · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
21 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The Omicron variant was first detected in October 2021, which evolved from the original SARS-CoV-2 strain and was found to possess many mutations. Immune evasion was one of the notable consequences of these mutations. Despite Omicron exhibiting increased transmissibility, the rates of hospitalizations and deaths among patients infected with this variant were substantially lower when compared to other strains. However, concluding that the Omicron variant is less severe than other variants of SARS-CoV-2 requires consideration of multiple factors, including the vaccination status of infected patients as well as any previous infections with other variants. This review compiled data about any reported indicators of severity in Omicron-infected patients, including studies comparing Omicron with other variants while adjusting for confounders. A comprehensive search was conducted using different databases to target any studies about Omicron. In total, 62 studies met our inclusion criteria and were included in this study. Many studies reported a significantly reduced risk of hospitalization, ICU admission, need for oxygenation/ventilation, and death in Omicron-infected patients compared to patients infected with other variants, such as Delta. Some studies, however, reported comparable severity in Omicron infected patients as to other variants emphasizing a substantial risk for severe illness. Furthermore, the COVID-19 vaccines were less effective against Omicron relative to previous lineages, except after receiving the booster dose. One study recommended vaccination during pregnancy, which may help prevent future cases of severe SARS-CoV-2 pneumonia in neonates and young infants due to the transfer of humoral response from the mother.
Indexed as
Identifiers
What Socratic holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.