ArticleInfluenza and other respiratory viruses2022
Epidemiological analysis of the first 1000 cases of SARS-CoV-2 lineage BA.1 (B.1.1.529, Omicron) compared with co-circulating Delta in Wales, UK.
Article in Influenza and other respiratory viruses, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 3 of them syntheses that pooled it.
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Who cites it
14 citing papers in PubMed, 3 syntheses or guidelines pooled it.
- Comparison of Omicron and Delta Variants of SARS-CoV-2: A Systematic Review of Current Evidence.Infectious disorders drug targets · 2024Pooled it
- Multidisciplinary inpatient rehabilitation for older adults with COVID-19: a systematic review and meta-analysis of clinical and process outcomes.BMC geriatrics · 2023Pooled it
- Pooled it
- The potential of genomic epidemiology: capitalizing on its practical use for impact in the healthcare setting.Frontiers in public health · 2025Article
- Current Updates on Variants of SARS-CoV- 2: Systematic Review.Health science reports · 2024Review
- Clinical Features and Prognosis of Patients with COVID-19 and B-Cell Non-Hodgkin Lymphoma.Infection and drug resistance · 2024Article
- SARS-CoV-2 Vaccine Breakthrough Infections of Omicron and Delta Variants in Healthcare Workers.Vaccines · 2023Article
- Interaction of Laurusides 1 and 2 with the 3C-like Protease (MInternational journal of molecular sciences · 2023Article
- Prevalence of Olfactory Dysfunction with the Omicron Variant of SARS-CoV-2: A Systematic Review and Meta-analysis.medRxiv : the preprint server for health sciences · 2023Article
- Epidemiological and laboratory characteristics of Omicron infection in a general hospital in Guangzhou: a retrospective study.Frontiers in public health · 2023Article
- Influencing factors of nucleic acid negative conversion in patients with mild and common COVID-19 induced by the Omicron variant of SARS-COV-2.Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences · 2022Article
- Machine learning-based scoring system to predict in-hospital outcomes in patients hospitalized with COVID-19.Archives of cardiovascular diseases · 2022Observational
- Epidemiological analysis of the first 1000 cases of SARS-CoV-2 lineage BA.1 (B.1.1.529, Omicron) compared with co-circulating Delta in Wales, UK.Influenza and other respiratory viruses · 2022Article
- SARS-CoV-2 Omicron BA.5: Riding the seventh wave in Central Canada.Influenza and other respiratory viruses · 2022Article
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15 authors.
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Abstract
backgroundThe Omicron (lineage B.1.1.529) variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in Wales, UK, on 3 December 2021. The aim of the study was to describe the first 1000 cases of the Omicron variant by demographic, vaccination status, travel and severe outcome status and compare this to contemporaneous cases of the Delta variant.
methodsTesting, typing and contact tracing data were collected by Public Health Wales and analysis undertaken by the Communicable Disease Surveillance Centre (CDSC). Risk ratios for demographic factors and symptoms were calculated comparing Omicron cases to Delta cases identified over the same time period.
resultsBy 14 December 2021, 1000 cases of the Omicron variant had been identified in Wales. Of the first 1000, just 3% of cases had a prior history of travel revealing rapid community transmission. A higher proportion of Omicron cases were identified in individuals aged 20-39, and most cases were double vaccinated (65.9%) or boosted (15.7%). Age-adjusted analysis also revealed that Omicron cases were less likely to be hospitalised (0.4%) or report symptoms (60.8%). Specifically a significant reduction was observed in the proportion of Omicron cases reporting anosmia (8.9%).
conclusionKey findings include a lower risk of anosmia and a reduced risk of hospitalisation in the first 1000 Omicron cases compared with co-circulating Delta cases. We also identify that existing measures for travel restrictions to control importations of new variants identified outside the United Kingdom did not prevent the rapid ingress of Omicron within Wales.
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