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2017 Fiscal Year Annual Research Report

Epidemiological study on rotavirus diarrhea and a study on the mode of trasmisson

Research Project

Project/Area Number 15H05286
Research InstitutionNagasaki University

Principal Investigator

一瀬 休生  長崎大学, 熱帯医学研究所, 教授 (70176296)

Co-Investigator(Kenkyū-buntansha) 長谷川 慎  長浜バイオ大学, バイオサイエンス学部, 教授 (10367899)
Project Period (FY) 2015-04-01 – 2018-03-31
Keywordsロタウイルス / ジェノタイピング / 感染モード / ワクチン効果 / ケニア
Outline of Annual Research Achievements

ケニアにおけるロタウイルスワクチン導入について下痢症患者由来のロタウイルス株の変異の実相解明を行うためにウイルス株のジェノタイプを行い、同時にロタウイルス感染モードの解明を行うことが本研究の目的である。
ナイロビ近郊のキアンブカウンテイー病院およびビクトリア湖畔のビタ地区のビタサブカウンテイーに下痢症で入院した小児を対象として疫学調査を行った。下痢症の患者検体から検出されたロタウイルスの検出率は2地域では異なるものの、ケニアで実施されているロタウイルスワクチンによる下痢症発症の減少効果はそれぞれの地域でほぼ50%弱であり、接種後に出現したジェノタイプはG2P4が優勢で、2地域おいても同様の結果であった。ロタウイルスの感染ルートを解明する目的で、キアンブ地区で金属メッシュデバイスを用いて補足した空気検体からロタウイルス粒子の検出をPCR法で行った。バッファー条件や土壌に含まれるPCR反応阻害物質の抑制条件を検討し、VP4、VP7の遺伝子をsemi-nested PCRで検出した結果、4ミクロン程度の比較的大きなサイズのメッシュを用いると、291検体中、18検体の検出が可能であった。
このことからケニアで補足した空気検体からかなりのロタウイルス粒子が検出されることが明らかとなり、空気を介した感染を示唆する結果であった。現在さらに検出条件などの要因を加味した分析を行っている。さらにロタウイルスによる下痢症の季節的、気候的変化に関する分析を行い、感染モードの解明に迫っている。

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

  • Research Products

    (12 results)

All 2018 2017

All Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Journal Article] Impact of rotavirus vaccination on rotavirus hospitalization rates among a resource-limited rural population in Mbita, Western Kenya2018

    • Author(s)
      Ernest Apondi Wandera, Shah Mohammad1, Martin Bundi, James Nyangao, Amina Galata, Cyrus Kathiiko, Erick Odoyo, Sora Guyo, Gabriel Miring’u, Satoshi Komoto and Yoshio Ichinose
    • Journal Title

      Tropical Medicine & International Health

      Volume: 2 Pages: 201-211

    • DOI

      10.1111/tmi.13040

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Variation in Rotavirus Coverage by Sub-counties in Kenya2017

    • Author(s)
      Ernest A. Wandera1, Shah Mohammad1, John Ouko, James Yatitch, Koki Taniguchi and Yoshio Ichinose
    • Journal Title

      Trop Med Health

      Volume: 45(9) Pages: 223-239

    • DOI

      10.1186/s41182-017-0051-z.

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Detection of rotavirus in clinical specimens using an immunosensor prototype based on the photon burst counting technique2017

    • Author(s)
      Makoto Hasegawa, Ernest Apondi Wandera, Yuka Inoue, Nanami Kimura, Ryuzo Sasaki, Tamio Mizukami, Mohammad Monir Shah, Nobuaki Shirai, Osamu Takei, Hironori Shindo, and Yoshio Ichinose
    • Journal Title

      Biomed. Opt. Express

      Volume: 8(7) Pages: 3383-3394

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Impact of Rotauirus and All-cause Gasteroenteritis in Peri-Urban Kenyan Children2017

    • Author(s)
      Ernest A. Wandera1, Mohammad1 S., Bundi M., Komoto S., Nyangao J., Kathihiko C., Odoyo E., Miring’u G., Taniguchi K. and Ichinose Y.
    • Journal Title

      Vaccine

      Volume: 35 Pages: 5217-5223

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Burden of Rotavirus gastroenteritis in children under five years old admitted with diarrhea in an urban and a rural setting in Kenya2017

    • Author(s)
      Shah M, Odoyo E, Wandera EA, Bundi M, Miringu G, Guyo S, Kathiiko C, Galata A, Komoto S, Nyangao J, Karama M, Tsuji T, Taniguchi K, Morita K, Ichinose Y
    • Journal Title

      Jpn. J. Infect. Dis.

      Volume: 70 Pages: 442-447

    • DOI

      10.7883/yoken.JJID.2016.398

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Impact of Rotavirus Vaccination on Rotavirus and All-Cause Gastroenteritis in Central Kenya2018

    • Author(s)
      Ernest A. Wandela(研究協力者)
    • Organizer
      1st Africa-Asia Rotavirus Symposium
    • Int'l Joint Research
  • [Presentation] Cholera outbreak caused by drug resistant Vibrio cholerae O1 strains in Kenya2017

    • Author(s)
      Mohammad Shah, Martin Bundi, Sora Guyo, Cyrus Kathiiko, Gabriel Miringu, Yoshio Ichinose
    • Organizer
      the 13th Nagasaki-Singapore Medical Symposium/Leading Program International Symposium
    • Int'l Joint Research
  • [Presentation] An outbreak of Diarrhea in Madera, Kenya Due to Escherichia coli Serogroup O-untypable strain that had a coding gene for Entero-aggregative coli heat-stable enterotoxin 12017

    • Author(s)
      Yoshio Ichinose, Sadayuki Ochi, Erick Odoyo, Martin Bundi, Gabriel Miringu, Sora Guyo, Samuel Kariuki, and Shah Mohammad
    • Organizer
      4th international Conference on Tropical Medicine Infectious Diseases & Public Health
    • Int'l Joint Research / Invited
  • [Presentation] Early Impact of Rotavirus Vaccination in Rural Resource-Limited Setting in Kenya2017

    • Author(s)
      Shah Mohammad, Ernest Apondi Wandera, Martin Bundi, James Nyangao, Amina Galata, Cyrus Kathiiko, Erick Odoyo, Gabriel Miring’u, Satoshi Komoto, Yoshio Ichinose
    • Organizer
      the 16th Awaji International Forum on Infection and Immunity
    • Int'l Joint Research
  • [Presentation] Prevalence and virulence factors of Enteroaggregative Escherichia coli (EAEC) isolated from children admitted with diarrheal disease in Kiambu County, Kenya2017

    • Author(s)
      Erick Odoyo, Martin Bundi, Cyrus Kathiiko, Gabriel Miringu, Sora Guyo, Ernest Wandera, Mohamed Karama, Mohammad Shah, Yoshio Ichinose
    • Organizer
      the 16th Awaji International Forum on Infection and Immunity
    • Int'l Joint Research
  • [Presentation] An Outbreak of Diarrhea in Mandera, Kenya due to Escherichia coli Serogroup O-Nontypable strain that had a coding gene for Enteroaggegative E. coli heat-stable enterotoxin 12017

    • Author(s)
      Sadayuki Ochi1, Mohammad Shah, Erick Odoyo, Martin Bundi, Gabriel Miring’u, Sora Guyo, Ernest Wandera, Cyrus Kathiiko, Samuel Kariuki, Mohamed Karama, Takao Tsuji and Yoshio Ichinose
    • Organizer
      The 3rd Africa International Biotechnology and Biomedical Conference
    • Int'l Joint Research
  • [Presentation] Characterization of V. cholerae O1 strains isolated from cholera outbreaks in Kenya: 1975-20172017

    • Author(s)
      Martin Bundi, Mohammad Shah, Eric Odoyo, Cyrus Kathiiko, Ernest Wandera, Gabriel Miring’u, Sora Guyo, Amina Galata, Kouichi Morita and Yoshio Ichinose
    • Organizer
      The 3rd Africa International Biotechnology and Biomedical Conference
    • Int'l Joint Research

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Published: 2018-12-17  

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