ArticleBMC infectious diseases2022
COVID-19 in Japan, January-March 2020: insights from the first three months of the epidemic.
Article in BMC infectious diseases, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Risk of severe infections in patients with triple-negative breast cancer treated with atezolizumab plus nab-paclitaxel: a real-world, postmarketing database study in Japan.International journal of clinical oncology · 2025Article
- Treatment Behaviors of Patients With Odontogenic Infections During the COVID-19 Pandemic.Cureus · 2025Article
- Greater impact of COVID-19 on peer-supported addiction services than government-owned services for addiction in Japan: A nationwide 3-year longitudinal cohort study.PCN reports : psychiatry and clinical neurosciences · 2024Article
- Human Papillomavirus Self-Sampling for Unscreened Women Aged 24 Years During the COVID-19 Pandemic.Healthcare (Basel, Switzerland) · 2024Article
- Effect of Long-Distance Domestic Travel Ban Policies in Japan on COVID-19 Outbreak Dynamics During Dominance of the Ancestral Strain: Ex Post Facto Retrospective Observation Study.Online journal of public health informatics · 2024Article
- Article
- The Emergence and Widespread Circulation of Enteric Viruses Throughout the COVID-19 Pandemic: A Wastewater-Based Evidence.Food and environmental virology · 2023Article
- Evolution of the viral genomes of SARS-CoV-2 in association with the changes in local condition: a genomic epidemiological study of a suburban city of Japan.DNA research : an international journal for rapid publication of reports on genes and genomes · 2023Article
- Genetic diversity and declining norovirus prevalence in infants and children during Japan's COVID-19 pandemic: a three-year molecular surveillance.Archives of virology · 2023Article
- Genotype Diversity of Enteric Viruses in Wastewater Amid the COVID-19 Pandemic.Food and environmental virology · 2023Article
Corrections and comments
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Authors and funding
8 authors.
Funding
Abstract
backgroundUnderstanding the characteristics and natural history of novel pathogens is crucial to inform successful control measures. Japan was one of the first affected countries in the COVID-19 pandemic reporting their first case on 14 January 2020. Interventions including airport screening, contact tracing, and cluster investigations were quickly implemented. Here we present insights from the first 3 months of the epidemic in Japan based on detailed case data.
methodsWe conducted descriptive analyses based on information systematically extracted from individual case reports from 13 January to 31 March 2020 including patient demographics, date of report and symptom onset, symptom progression, travel history, and contact type. We analysed symptom progression and estimated the time-varying reproduction number, R
resultsThe corrected fitted mean onset-to-reporting delay after the peak was 4 days (standard deviation: ± 2 days). Early transmission was driven primarily by returning travellers with R
conclusionsInformation collected in the early phases of an outbreak are important in characterising any novel pathogen. The availability of timely and detailed data and appropriate analyses is critical to estimate and understand a pathogen's transmissibility, high-risk settings for transmission, and key symptoms. These insights can help to inform urgent response strategies.
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