ArticleIrish journal of medical science2023
SARS CoV-2 reinfection rate is higher in the Omicron variant than in the Alpha and Delta variants.
Article in Irish journal of medical science, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 4 of them syntheses that pooled it.
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Who cites it
24 citing papers in PubMed, 4 syntheses or guidelines pooled it, 34 citations in OpenAlex.
- Incidence, severity, risk factors and outcomes of SARS-CoV-2 reinfections during the Omicron period: a systematic review and meta-analysis.Journal of global health · 2025Pooled it
- Comparison of Omicron and Delta Variants of SARS-CoV-2: A Systematic Review of Current Evidence.Infectious disorders drug targets · 2024Pooled it
- Incidence and outcome of SARS-CoV-2 reinfection in the pre-Omicron era: A global systematic review and meta-analysis.Journal of global health · 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
- Modeling two-strain competition with reinfection: Mathematical analyses and epidemiological implications.Infectious Disease Modelling · 2026Article
- Prevalence and Factors Associated with Common Mental Disorders and Posttraumatic Stress Disorder Among Healthcare Workers in a Reference Center for Infectious Diseases During the COVID-19 Pandemic: A Survey-Based Cross-Sectional Study.International journal of environmental research and public health · 2025Article
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- A brief overview of SARS-CoV-2 infection and its management strategies: a recent update.Molecular and cellular biochemistry · 2024Review
- Homologous and Heterologous Covid-19 Booster Vaccinations Against SARS-CoV-2 Infection in the Elderly.Current microbiology · 2024Article
- A mini review of reinfection with the SARS-CoV-2 Omicron variant.Health science reports · 2024Article
- Frequency and risk of SARS-CoV-2 reinfections in Norway: a nation-wide study, February 2020 to January 2022.BMC public health · 2024Article
- Evaluating the risk of SARS-CoV-2 reinfection with the Omicron or Delta variant in Wales, UK.PloS one · 2024Article
- Investigation of epidemiological and clinical characteristics of people infected with SARS-CoV-2 during the second pandemic of COVID-19 in Chengdu, China.Frontiers in public health · 2024Article
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- Modeling the XBB strain of SARS-CoV-2: Competition between variants and impact of reinfection.Journal of theoretical biology · 2023Article
- The representative COVID-19 cohort Munich (KoCo19): from the beginning of the pandemic to the Delta virus variant.BMC infectious diseases · 2023Article
- Article
- An ecological study on reinfection rates using a large dataset of RT-qPCR tests for SARS-CoV-2 in Santiago of Chile.Frontiers in public health · 2023Article
- A deterministic compartmental model for the transition between variants in the spread of Covid-19 in Italy.PloS one · 2023Article
Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
objectivesMany mutations in variants for instance Delta and Alpha are associated with immune evasion and higher infectious potential. There are uncertainties regarding Omicron. In this regard, we aimed to compare the frequency of reinfection of SARS CoV-2 variants in our hospital between April 22, 2021 and January 26, 2022.
methodThe reinfection rates and demographic characteristics of a total of 27,487 COVID-19 patients infected with different SARS CoV-2 variants were examined.
resultsReinfection was found in 26 (0.46%) of 5554 Alpha, 209 (1.16%) of 17,941 Delta, and 520 (13.0%) of 3992 Omicron variants. A statistically significant difference was observed between the reinfection rates of the variants (p = 0.000). The mean reinfection days were calculated as 204.4 ± 51.1 in the Alpha variant, 291.2 ± 58.2 in the Delta variant, and 361.2 ± 131.6 in the Omicron variant (p = 0.000). It was observed that 16.5% of reinfection cases caught COVID-19 for the second time 3-6 months after the first COVID-19 infection, 36.7% after 6-12 months, and 46.8% after more than 12 months. There was a significant difference between the times in reinfection cases. Most reinfections occurred more than 12 months apart. Among those with a reinfection time > 12 months, 0% had Alpha, 3.4% had Delta, and 96.6% had Omicron variants.
conclusionThe highest reinfection rate was observed in the Omicron variant. Reinfection was approximately 30 times more frequent in the Omicron variant than in the Alpha variant and 10 times more frequent in the Delta variant.
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