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Estimation of the total number of seasonal influenza infections by fixed-point observation and serological survey

Research Project

Project/Area Number 18K11541
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 62010:Life, health and medical informatics-related
Research InstitutionUniversity of Nagasaki (2020-2023)
The Institute of Statistical Mathematics (2018-2019)

Principal Investigator

Masaya Saito  長崎県立大学, 情報システム学部, 准教授 (00470047)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsインフルエンザ / 総感染者数の推定 / 機構モデル / SIRモデル / 定点報告 / 感染症数理モデル / 時系列解析 / データ同化 / メタ・ポピュレーションモデル / 年令別SIRモデル / 数理モデル / 逆問題 / 感染者数推定 / ベイズ推定 / 疫学 / 血清
Outline of Final Research Achievements

Seasonal influenza, classified as category 5 infectious diseases, is monitored through sentinel surveillance conducted by designated medical institutions. To assess the societal burden of this disease, estimating the total number of infected individuals is essential. In this study, we examined how well the reported rate of the surveillance can be captured by considering the dynamics of the epidemic, specifically the process where infected individuals generate subsequent infections through contact with susceptible individuals. The results confirmed that under ideal conditions, reproducibility is achievable through numerical simulations. However, when analyzing real epidemic data of the 2009 outbreak, while the approximate age dependence of the capture rate aligns with serum data, certain estimated values take unphysical ones. Investigation of the effect of an inconsistent contact matrix is one of the issues to be considered.

Academic Significance and Societal Importance of the Research Achievements

今般の新型コロナウィルス流行のような極めて社会インパクトが大きい場合を除き,感染者の実数が直接把握できることは稀であり,標本調査からの復元手法の開発は重要である.しかしながら,一部の年齢群では適切でない推定値が得られるなど(例えば人口比が負数になる),実データに適用する上での課題が残された.仮定する伝染プロセスとデータ生成機構の両面から見直す必要があると考えられる.本研究では,接触行動のモデリングにおいて,年齢群間の有効接触の頻度として先行調査の結果を所与としたが,状況や当該感染症の特徴によって変わりうるものであり,実データを解析する上でその補正方法などが今後検討すべき課題であると考えられる.

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021 2019 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (6 results)

  • [Journal Article] COVID-19流行動態の再構成によるメタ・ポピュレーションモデルの記述性能評価2022

    • Author(s)
      斎藤正也,竹内昌平,山内武紀,内田満夫
    • Journal Title

      統計数理

      Volume: 70(1) Pages: 59-68

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reconstructing the household transmission of influenza in the suburbs of Tokyo based on clinical cases2021

    • Author(s)
      Masaya M. Saito, Nobuo Hirotsu, Hiroka Hamada, Mio Takei, Keisuke Honda, Takamichi Baba, Takahiro Hasegawa4, Yoshitake Kitanishi
    • Journal Title

      Theoretical Biology and Medical Modelling

      Volume: 18:7 Issue: 1 Pages: 1-10

    • DOI

      10.1186/s12976-021-00138-x

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] HERSYSによる長崎県のCOVID19流行動態2023

    • Author(s)
      斎藤正也
    • Organizer
      統計数理研究所公開シンポジウム「COVID-19とデータ科学」
    • Related Report
      2022 Research-status Report
  • [Presentation] 感染症にかかわる統計的モデリングのための流行動態の記述: オミクロン株国内流入の事例より2022

    • Author(s)
      斎藤正也
    • Organizer
      第16回日本統計学会春季集会・企画セッション「モデリング研究の展開と実践」
    • Related Report
      2021 Research-status Report
  • [Presentation] Estimation of the burden of influenza using surveillance and epidemiological data2019

    • Author(s)
      Masaya Saito, Hiroshi Nishiura
    • Organizer
      Computational and Mathematical Population Dynamics 5
    • Related Report
      2019 Research-status Report
  • [Presentation] ピーク近傍の流行動態を用いた年令別定点報の捕捉率の推定2019

    • Author(s)
      斎藤正也・西浦博
    • Organizer
      応用数理学会
    • Related Report
      2019 Research-status Report
  • [Presentation] Estimation of the burden of influenza using surveillance and epidemiological data2019

    • Author(s)
      Masaya M. Saito, Hiroshi Nishiura
    • Organizer
      Fifth Conference on Computational and Mathematical Population Dynamics
    • Related Report
      2018 Research-status Report
  • [Presentation] 第77回日本公衆衛生学会総会2018

    • Author(s)
      斎藤正也・西浦博
    • Organizer
      血清調査データを用いたインフルエンザ報告率の推定
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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