ArticleGHM open2024
Validity of vaccination information in the COVID-19 surveillance system in Japan: Implications for developing efficient and highly valid data collection systems in future pandemics.
Article in GHM open, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
What it found
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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.
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Who cites it
4 citing papers in PubMed.
- Longitudinal characterization of COVID-19 across a surveillance transition in Japan: thirteen epidemic waves, 2020-2025.Scientific reports · 2026Article
- Prevalence and Risk Factors for Persistent Post-COVID-19 Condition at 3, 6, 12, and 18 Months After Initial Infection Among Adults Living in a Community of Japan: Yao COVID-19 Study.Journal of medical virology · 2026Article
- Concerns about Methodological Flaws and Use of Retracted Evidence in the Opinion on COVID-19 Vaccination and Excess Mortality in Japan.JMA journal · 2026Article
- Age-specific patterns of all-cause mortality across COVID-19 booster dose groups in two Japanese municipalities: an exploratory analysis.Frontiers in public health · 2026Observational
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Japan's government developed the Health Center Real-time Information-sharing System on COVID-19 (HER-SYS), the national COVID-19 surveillance system, which relies on manual data entry. Following the COVID-19 vaccination campaign, physicians were mandated to report COVID-19 cases with vaccination history
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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.