ArticleInternational journal of environmental research and public health2022
Shorter Incubation Period among COVID-19 Cases with the BA.1 Omicron Variant.
Article in International journal of environmental research and public health, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers, 5 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
35 citing papers in PubMed, 5 syntheses or guidelines pooled it.
- Consolidating Estimates of the Incubation Period for Omicron Subvariants From the Literature and Their Comparison to the Estimate From Taiwan: A Systematic Review and Meta-Analysis, September 2024.Influenza and other respiratory viruses · 2025Pooled it
- Comparison of Omicron and Delta Variants of SARS-CoV-2: A Systematic Review of Current Evidence.Infectious disorders drug targets · 2024Pooled 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
- Assessing changes in incubation period, serial interval, and generation time of SARS-CoV-2 variants of concern: a systematic review and meta-analysis.BMC medicine · 2023Pooled it
- Incubation Period of COVID-19 Caused by Unique SARS-CoV-2 Strains: A Systematic Review and Meta-analysis.JAMA network open · 2022Pooled it
- Impact of healthcare-associated respiratory virus infections in children.Infection prevention in practice · 2026Article
- Impact of imported COVID-19 cases on South Korea's response: variant transitions and regional patterns (2020-2023).BMC infectious diseases · 2025Article
- Did COVID-19 surveillance system sensitivity change after Omicron? a retrospective observational study in England.BMC infectious diseases · 2025Observational
- Evaluating trade-offs between COVID-19 prevention and learning loss: an agent-based simulation analysis.Royal Society open science · 2025Article
- Evaluating strategies for global respiratory pandemic control at ports: a modelling study.BMJ public health · 2025Article
- Comparison of COVID-19 testing strategies and costs for professional sports teams: A case study of J. League clubs.PloS one · 2025Article
- A two-variant model of SARS-COV-2 transmission: estimating the characteristics of a newly emerging strain.BMC infectious diseases · 2024Article
- Key issues in Japan's public health centers to prepare for future pandemics: a text mining study using a topic model.BMC health services research · 2024Article
- Article
- Influenza and COVID-19 co-infection and vaccine effectiveness against severe cases: a mathematical modeling study.Frontiers in cellular and infection microbiology · 2024Article
- SARS-CoV-2 Incubation Period during Omicron BA.5-Dominant Period, Japan (Response).Emerging infectious diseases · 2024Article
- SARS-CoV-2 Incubation Period during Omicron BA.5-Dominant Period, Japan.Emerging infectious diseases · 2024Article
- Unravelling the effect of New Year's Eve celebrations on SARS-CoV-2 transmission.Scientific reports · 2023Article
- Reconstructing COVID-19 incidences from positive RT-PCR tests by deconvolution.BMC infectious diseases · 2023Article
- The relationship between controllability, optimal testing resource allocation, and incubation-latent period mismatch as revealed by COVID-19.Infectious Disease Modelling · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
We aimed to elucidate the range of the incubation period in patients infected with the SARS-CoV-2 Omicron variant in comparison with the Alpha variant. Contact tracing data from three Japanese public health centers (total residents, 1.06 million) collected following the guidelines of the Infectious Diseases Control Law were reviewed for 1589 PCR-confirmed COVID-19 cases diagnosed in January 2022. We identified 77 eligible symptomatic patients for whom the date and setting of transmission were known, in the absence of any other probable routes of transmission. The observed incubation period was 3.03 ± 1.35 days (mean ± SDM). In the log-normal distribution, 5th, 50th and 95th percentile values were 1.3 days (95% CI: 1.0−1.6), 2.8 days (2.5−3.1) and 5.8 days (4.8−7.5), significantly shorter than among the 51 patients with the Alpha variant diagnosed in April and May in 2021 (4.94 days ± 2.19, 2.1 days (1.5−2.7), 4.5 days (4.0−5.1) and 9.6 days (7.4−13.0), p < 0.001). As this incubation period, mainly of sublineage BA.1, is even shorter than that in the Delta variant, it is thought to partially explain the variant replacement occurring in late 2021 to early 2022 in many countries.
Indexed as
Identifiers
What OpenQuestion 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 OpenQuestion graph.