Personnel Information

写真a

SAITO Ryoichi


Job title

Professor

Mail Address

r-saito.mi@tmd.ac.jp

Research Areas, Keywords

bacteria, virulence, antibiotic resistance, molecular epidemiology, vaccine, rapid detection
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Graduating School 【 display / non-display 】

  • Tokyo Medical and Dental University, Faculty of Medicine, 1997.03, Graduated

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Graduate School 【 display / non-display 】

  • Tokyo Medical and Dental University, Doctor's Course, 2007.03, Completed

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Degree 【 display / non-display 】

  • Doctor (Medical Laboratory Science)

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Campus Career 【 display / non-display 】

  • 2010.04
    -
    2012.04
    Tokyo Medical and Dental University， Graduate School of Health Care Sciences， Biomedical Laboratory Sciences， Moleculo-genetic Sciences， Microbiology and Immunology， Assistant Professor
  • 2012.05
    -
    2018.03
    Tokyo Medical and Dental University， Graduate School of Health Care Sciences， Biomedical Laboratory Sciences， Moleculo-genetic Sciences， Microbiology and Immunology， Associate Professor
  • 2018.04
    -
    2020.07
    Tokyo Medical and Dental University， Graduate School of Medical and Dental Sciences， Biomedical Sciences and Engineering， Division of Biomedical Laboratory Sciences， Department of Molecular Microbiology， Associate Professor
  • 2020.06
    -
    2020.07
    Tokyo Medical and Dental University， Graduate School of Medical and Dental Sciences， Biomedical Sciences and Engineering， Division of Biomedical Laboratory Sciences， Department of Molecular Microbiology， Associate Professor
  • 2020.08
    -
    2023.04
    Tokyo Medical and Dental University， Graduate School of Medical and Dental Sciences， Biomedical Sciences and Engineering， Division of Biomedical Laboratory Sciences， Department of Molecular Microbiology， Professor
  • 2023.05
    -
    Now
    Tokyo Medical and Dental University， Graduate School of Medical and Dental Sciences， Biomedical Sciences and Engineering， Division of Biomedical Laboratory Sciences， Department of Molecular Microbiology and Immunology， Professor

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External Career 【 display / non-display 】

  • 1997.04
    -
    2009.06
    University of Tokyo Hospital, Department of Clinical Laboratory, Infection Control and Prevention , Medical Technologist
  • 2009.07
    -
    2010.03
    National Institute of Infectious Diseases , Department of Bacteriology II, Researcher
  • 2010.04
    -
    2013.03
    National Institute of Infectious Diseases , Department of Bacteriology Ⅱ, Visiting Researcher
  • 2015.11
    -
    2017.03
    Oregon State University, College of Veterinary Medicine, Courtesy Associate Professor
  • 2018.05
    -
    Now
    National Institute of Infectious Diseases , Department of Bacteriology I, Visiting Researcher
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Academic Society Affiliations 【 display / non-display 】

  • Japanese Association for Infectious diseases

  • Japanese Association of Medical Technologists

  • Japanese Society for Bacteriology

  • Japanese Society for Clinical Microbiology

  • Japanese Society of Environmental Infections

  • The American Society for Microbiology

  • Japanese Society of Laboratory Medicine

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Academic Activity 【 display / non-display 】

  • 2020.04
    -
    Now
    Japanese Society for Clinical Microbiology Councilor
  • 2019.04
    -
    Now
    Japanese Association for Anaerobic Infection Research Manager
  • 2012.01
    -
    Now
    Japanese Society for Clinical Microbiology Councilor
  • 2018.01
    -
    Now
    Japanese Society for Clinical Microbiology Councilor
  • 2019.04
    -
    2023.05
    Japanese association of medical technology education Director, Editor-in-chief
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Research Areas 【 display / non-display 】

  • Bacteriology

  • Infectious disease medicine

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Qualification Acquired 【 display / non-display 】

  • Infection Control Doctor

  • Japanese Board of Infection Control Microbiological Technologist

  • Japanese Board of Microbiological Technologist

  • Medical Technologist

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Research Theme 【 display / non-display 】

  • Research on the evolution and diversity of multidrug-resistant bacteria

  • Research on environmental microbiome dynamics and interactions for AMR transmission

  • Research on the regulation system of virulence in pathogenic bacteria

  • Development of molecular biological and bacteriological methods for rapid identification and typing of pathogenic bacteria

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Published Papers & Misc 【 display / non-display 】

  1. Yoshiaki Iwashita, Shizue Takeuchi, Yoshiro Hadano, Taira Kawamura, Yuichiro Tanaka, Rie Sato, Nobuhiro Kodani, Noriaki Yamada, Ryoichi Saito. A case of community-acquired Clostridioides difficile infection causing intussusception, severe pneumonia, and severe hypokalemia. BMC Infect Dis. 2024.07; 24 (1): 744. ( PubMed, DOI )

  2. Samiratu Mahazu, Isaac Prah, Yusuke Ota, Takaya Hayashi, Masato Suzuki, Mitsunori Yoshida, Yoshihiko Hoshino, Yukihiro Akeda, Toshihiko Suzuki, Tomoko Ishino, Anthony Samuel Ablordey, Ryoichi Saito. Colistin Resistance Mediated by Mcr-3-Related Phosphoethanolamine Transferase Genes in Aeromonas Species Isolated from Aquatic Environments in Avaga and Pakro Communities in the Eastern Region of Ghana. Infect Drug Resist. 2024.07; 17 3011-3023. ( PubMed, DOI )

  3. Kayo Yamada, Alafate Ayibieke, Akari Ikeda, Kageto Yamada, Shinji Ogihara, Shuji Tohda, Ryoichi Saito. Molecular characterization of Staphylococcus epidermidis bloodstream isolates from two hospitals in Tokyo. Laboratory Medicine International. 2024.06; 3 (2): 33-41. ( DOI )

  4. Yusuke Ota, Kei Yasunaga, Samiratu Mahazu, Isaac Prah, Satoshi Nagai, Takaya Hayashi, Masato Suzuki, Mitsunori Yoshida, Yoshihiko Hoshino, Yukihiro Akeda, Toshihiko Suzuki, Yoshiaki Gu, Ryoichi Saito. Comparative evaluation of analytical pipelines for illumina short- and nanopore long-read 16S rRNA gene amplicon sequencing with mock microbial communities. J Microbiol Methods. 2024.04; 221 106929. ( PubMed, DOI )

  5. Yusuke Kanno, Shuzo Masui, Yusuke Ota, Ryoichi Saito, Takasi Nisisako. Electrochemical sensing strategies for on-site testing of pathogenic nucleic acids. Electrochemical Science Advance. 2024.04; 1-10. ( DOI )

  6. Azusa Yamazaki, Yoko Nukui, Takahiro Kameda, Ryoichi Saito, Yuki Koda, Naoya Ichimura, Shuji Tohda, Ryunosuke Ohkawa. Variation in presepsin and thrombomodulin levels for predicting COVID-19 mortality. Sci Rep. 2023.12; 13 (1): 21493. ( PubMed, DOI )

  7. Taira Kawamura, Isaac Prah, Samiratu Mahazu, Anthony Ablordey, Ryoichi Saito. Types A and F Clostridium perfringens in healthcare wastewater from Ghana. Appl Environ Microbiol. 2023.12; e0161923. ( PubMed, DOI )

  8. Hideyuki Takahashi, Masatomo Morita, Hajime Kamiya, Munehisa Fukusumi, Mitsuru Yasuda, Masatomi Sunagawa, Haruna Nakamura-Miwa, Yuki Ohama, Ken Shimuta, Makoto Ohnishi, Ryoichi Saito, Yukihiro Akeda. Emergence of ciprofloxacin- and penicillin-resistant Neisseria meningitidis isolates in Japan between 2003 and 2020 and its genetic features. Antimicrob Agents Chemother. 2023.11; 67 (11): e0074423. ( PubMed, DOI )

  9. Yusuke Ota, Isaac Prah, Samiratu Mahazu, Yoshiaki Gu, Yoko Nukui, Ryuji Koike, Ryoichi Saito. Novel insights into genetic characteristics of blaGES-encoding plasmids from hospital sewage. Front Microbiol. 2023.08; 14 1209195. ( PubMed, DOI )

  10. Yusuke Ota, Reina Okada, Hideyuki Takahashi, Ryoichi Saito. A mismatch amplification mutation assay for specific detection of ciprofloxacin-resistant Neisseria meningitidis. J Infect Chemother. 2023.05; 29 (5): 562-564. ( PubMed, DOI )

  11. Samiratu Mahazu, Isaac Prah, Yusuke Ota, Takaya Hayashi, Yoko Nukui, Masato Suzuki, Yoshihiko Hoshino, Yukihiro Akeda, Toshihiko Suzuki, Tomoko Ishino, Anthony Ablordey, Ryoichi Saito. Klebsiella species and Enterobacter cloacae isolates harboring blaOXA-181 and blaOXA-48: resistome, fitness cost, and plasmid stability. Microbiol Spectr. 2022.12; e0332022. ( PubMed, DOI )

  12. Yusuke Ota, Reina Okada, Hideyuki Takahashi, Ryoichi Saito. Molecular detection of fluoroquinolone-resistant Neisseria meningitidis by using mismatched PCR-restriction fragment length polymorphism technique. Front Cell Infect Microbiol. 2022.08; 12 911911. ( PubMed, DOI )

  13. Yusuke Ota, Chihiro Tani Sassa, Masayo Kashiwagi, Chikako Okawara, Shuji Tohda, Ryoichi Saito. Complete Genome Sequence of an Enterobacter roggenkampii Strain with Reduced Carbapenem Susceptibility Isolated from a Home-Visit Nursing Agency. Microbiol Resour Announc. 2022.08; e0035322. ( PubMed, DOI )

  14. Isaac Prah, Yoko Nukui, Shoji Yamaoka, Ryoichi Saito. Emergence of a high-risk Klebsiella michiganensis clone disseminating carbapenemase genes. Front Microbiol. 2022.05; 13 880248. ( PubMed, DOI )

  15. Yusuke Ota, Isaac Prah, Yoko Nukui, Ryuji Koike, Ryoichi Saito. blaKPC-2-Encoding IncP-6 Plasmids in Citrobacter freundii and Klebsiella variicola Strains from Hospital Sewage in Japan. Appl Environ Microbiol. 2022.04; e0001922. ( PubMed, DOI )

  16. Ryoichi Saito, Jun Nakajima, Isaac Prah, Masatomo Morita, Samiratu Mahazu, Yusuke Ota, Ayuka Kobayashi, Shuji Tohda, Hajime Kamiya, Hideyuki Takahashi, Makoto Ohnishi. Penicillin- and Ciprofloxacin-Resistant Invasive Neisseria meningitidis Isolates from Japan. Microbiol Spectr. 2022.04; e0062722. ( PubMed, DOI )

  17. Samiratu Mahazu, Wakana Sato, Alafate Ayibieke, Isaac Prah, Takaya Hayashi, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Insights and genetic features of extended-spectrum beta-lactamase producing Escherichia coli isolates from two hospitals in Ghana. Sci Rep. 2022.02; 12 (1): 1843. ( PubMed, DOI )

  18. Isaac Prah, Alafate Ayibieke, Samiratu Mahazu, Chihiro Tani Sassa, Takaya Hayashi, Shoji Yamaoka, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Emergence of oxacillinase-181 carbapenemase-producing diarrheagenic Escherichia coli in Ghana. Emerg Microbes Infect. 2021.12; 10 (1): 865-873. ( PubMed, DOI )

  19. Yusuke Ota, Natsune Hongou, Yoko Nukui, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Evaluation of polymerase chain reaction-based open reading frame typing method for the clonality investigation of Clostridioides difficile isolates. Anaerobe. 2021.12; 72 102462. ( PubMed, DOI )

  20. Samiratu Mahazu, Isaac Prah, Alafate Ayibieke, Wakana Sato, Takaya Hayashi, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Possible Dissemination of Escherichia coli Sequence Type 410 Closely Related to B4/H24RxC in Ghana. Front Microbiol. 2021.12; 12 770130. ( PubMed, DOI )

  21. Hideyuki Takahashi, Masaki Nakamura, Yuko Matsumoto, Shuji Yoshino, Tetsuya Kakita, Ken Shimuta, Hajime Kamiya, Ryoichi Saito, Makoto Ohnishi. Development of a simple and cost-effective gel-based duplex PCR method to identify both encapsulated and unencapsulated Neisseria meningitidis applicable under resource-limited conditions. J Infect Chemother. 2021.05; 27 (5): 773-777. ( PubMed, DOI )

  22. Isaac Prah, Alafate Ayibieke, Thi Thu Huong Nguyen, Atsushi Iguchi, Samiratu Mahazu, Wakana Sato, Takaya Hayashi, Shoji Yamaoka, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Virulence Profiles of Diarrheagenic Escherichia coli Isolated from the Western Region of Ghana. Jpn J Infect Dis. 2021.03; 74 (2): 115-121. ( PubMed, DOI )

  23. Alafate Ayibieke, Ayumi Kobayashi, Masato Suzuki, Wakana Sato, Samiratu Mahazu, Isaac Prah, Miyuki Mizoguchi, Kyoji Moriya, Takaya Hayashi, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Prevalence and characterization of carbapenem-hydrolyzing class D β-lactamase-producing Acinetobacter isolates from Ghana. Front Microbiol. 2020.11; 11 587398. ( PubMed, DOI )

  24. Koh Okamoto, Alafate Ayibieke, Ryoichi Saito, Kenichi Ogura, Yuki Magara, Reiko Ueda, Hina Ogawa, Shuji Hatakeyama. A nosocomial cluster of Roseomonas mucosa bacteremia possibly linked to contaminated hospital environment. J. Infect. Chemother.. 2020.08; 26 (8): 802-806. ( PubMed, DOI )

  25. Miyuki Mizoguchi, Yoshimi Matsumoto, Ryoichi Saito, Tomoaki Sato, Kyoji Moriya. Direct antibiotic susceptibility testing of blood cultures of gram-negative bacilli using the Drug Susceptibility Testing Microfluidic (DSTM) device. J. Infect. Chemother.. 2020.06; 26 (6): 554-562. ( PubMed, DOI )

  26. Yuta Okada, Shu Okugawa, Mahoko Ikeda, Tatsuya Kobayashi, Ryoichi Saito, Yoshimi Higurashi, Kyoji Moriya. Genetic diversity and epidemiology of accessory gene regulator loci in Clostridioides difficile. Access Microbiol. 2020.05; 2 (7): acmi000134. ( PubMed, DOI )

  27. Yukino Usui, Yoko Nukui, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Draft Genome Sequence of a Clostridioides difficile Sequence Type 97 Strain Belonging to Hypervirulent Clade 2. Microbiol Resour Announc. 2020.04; 9 (14): e00245-20. ( PubMed, DOI )

  28. Yukino Usui, Alafate Ayibieke, Yuko Kamiichi, Shu Okugawa, Kyoji Moriya, Shuji Tohda, Ryoichi Saito. Impact of deoxycholate on Clostridioides difficile growth, toxin production, and sporulation. Heliyon. 2020.04; 6 (4): e03717. ( PubMed, DOI )

  29. Yuta Okada, Yuka Yagihara, Yoshitaka Wakabayashi, Gene Igawa, Ryoichi Saito, Yoshimi Higurashi, Mahoko Ikeda, Keita Tatsuno, Shu Okugawa, Kyoji Moriya. Epidemiology and virulence-associated genes of Clostridioides difficile isolates and factors associated with toxin EIA results at a university hospital in Japan. Access Microbiol. 2019.12; 2 (2): acmi000086. ( PubMed, DOI )

  30. Ryoichi Saito, Yukino Usui, Alafate Ayibieke, Jun Nakajima, Isaac Prah, Kazunari Sonobe, Yoshibumi Aiso, Shiori Ito, Yasuhiro Itsui, Yoshiro Hadano, Yoko Nukui, Ryuji Koike, Shuji Tohda. Hypervirulent clade 2, ribotype 019/sequence type 67 Clostridioides difficile strain from Japan. Gut Pathog. 2019.11; 11 54. ( PubMed, DOI )

  31. Yoko Nukui, Takashi Chino, Chihiro Tani, Kazunari Sonobe, Yoshibumi Aiso, Shuji Tohda, Ryuji Koike, Ryoichi Saito. Molecular epidemiologic and clinical analysis of Helicobacter cinaedi bacteremia in Japan. Helicobacter. 2019.11; e12675. ( PubMed, DOI )

  32. Francesco Comandatore, Davide Sassera, Sion C Bayliss, Erika Scaltriti, Stefano Gaiarsa, Xiaoli Cao, Ana C Gales, Ryoichi Saito, Stefano Pongolini, Sylvain Brisse, Edward J Feil, Claudio Bandi. Gene Composition as a Potential Barrier to Large Recombinations in the Bacterial Pathogen Klebsiella pneumoniae. Genome Biol Evol. 2019.11; 11 (11): 3240-3251. ( PubMed, DOI )

  33. Yoko Nukui, Alafate Ayibieke, Makoto Taniguchi, Yoshibumi Aiso, Yuka Shibuya, Kazunari Sonobe, Jun Nakajima, Saki Kanehira, Yoshiro Hadano, Shuji Tohda, Ryuji Koike, Ryoichi Saito. Whole-genome analysis of EC129, an NDM-5-, CTX-M-14-, OXA-10- and MCR-1-co-producing Escherichia coli ST167 strain isolated from Japan. J Glob Antimicrob Resist. 2019.09; 18 148-150. ( PubMed, DOI )

  34. Yohei Washio, Shun-Ichiro Sakamoto, Ryoichi Saito, Takahito Nei, Masayo Morishima, Akihiro Shinoyama, Ayaka Tashiro, Ryoji Sugimoto. Infective endocarditis caused by Cardiobacterium valvarum. Access Microbiol. 2019.07; 1 (8): e000040. ( PubMed, DOI )

  35. Kageto Yamada, Ryoichi Saito, Saori Muto, Masakazu Sasaki, Hinako Murakami, Kotaro Aoki, Yoshikazu Ishii, Kazuhiro Tateda. Long-term observation of antimicrobial susceptibility and molecular characterisation of Campylobacter jejuni isolated in a Japanese general hospital 2000-2017. J Glob Antimicrob Resist. 2019.02; 18 59-63. ( PubMed, DOI )

  36. Alafate Ayibieke, Wakana Sato, Samiratu Mahazu, Isaac Prah, John Addow-Thompson, Mitsuko Ohashi, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Molecular characterisation of the NDM-1-encoding plasmid p2189-NDM in an Escherichia coli ST410 clinical isolate from Ghana. PLoS ONE. 2018.12; 13 (12): e0209623. ( PubMed, DOI )

  37. Ayako Kasai, Ayaka Ohta, Yuina Maeda, Kageto Yamada, Kazuyuki Tao, Ryoichi Saito. Novel mechanism responsible for high-level macrolide resistance in Moraxella catarrhalis. Infect Drug Resist. 2018.11; 11 2137-2140. ( PubMed, DOI )

  38. Saud Alanazi, Maryam Alnoman, Saeed Banawas, Ryoichi Saito, Mahfuzur R Sarker. The inhibitory effects of essential oil constituents against germination, outgrowth and vegetative growth of spores of Clostridium perfringens type A in laboratory medium and chicken meat. Food Microbiol.. 2018.08; 73 311-318. ( PubMed, DOI )

  39. Mahoko Ikeda, Miyuki Mizoguchi, Yukie Oshida, Keita Tatsuno, Ryoichi Saito, Mitsuhiro Okazaki, Shu Okugawa, Kyoji Moriya. Clinical and microbiological characteristics and occurrence of Klebsiella pneumoniae infection in Japan. Int J Gen Med. 2018.07; 11 293-299. ( PubMed, DOI )

  40. Ryoichi Saito, Prabhat K Talukdar, Saud S Alanazi, Mahfuzur R Sarker. RelA/DTD-mediated regulation of spore formation and toxin production by Clostridium perfringens type A strain SM101. Microbiology (Reading, Engl.). 2018.05; 164 (5): 835-847. ( PubMed, DOI )

  41. Shinji Ogihara, Ryoichi Saito, Etsuko Sawabe, Takahiro Kozakai, Mari Shima, Yoshibumi Aiso, Toshihide Fujie, Yoko Nukui, Ryuji Koike, Michio Hagihara, Shuji Tohda. Molecular typing of methicillin-resistant Staphylococcus aureus: Comparison of PCR-based open reading frame typing, multilocus sequence typing, and Staphylococcus protein A gene typing. J. Infect. Chemother.. 2018.04; 24 (4): 312-314. ( PubMed, DOI )

  42. Kageto Yamada, Ryoichi Saito, Saori Muto, Machiko Kashiwa, Yoshiko Tamamori, Shingo Fujisaki. Molecular Characterization of Fluoroquinolone-Resistant Moraxella catarrhalis Variants Generated In Vitro by Stepwise Selection. Antimicrob. Agents Chemother.. 2017.07; 61 (10): e01336-17. ( PubMed, DOI )

  43. Kageto Yamada, Katsumi Arai, Ryoichi Saito. Antimicrobial susceptibility to β-lactam antibiotics and production of BRO β-lactamase in clinical isolates of Moraxella catarrhalis from a Japanese hospital. J Microbiol Immunol Infect. 2017.06; 50 (3): 386-389. ( PubMed, DOI )

  44. Kageto Yamada, Machiko Kashiwa, Katsumi Arai, Noriyuki Nagano, Ryoichi Saito. Evaluation of the modified carbapenem inactivation method and sodium mercaptoacetate-combination method for the detection of metallo-β-lactamase production by carbapenemase-producing Enterobacteriaceae. J. Microbiol. Methods. 2017.01; 132 112-115. ( PubMed, DOI )

  45. Gene Igawa, Mika Casey, Etsuko Sawabe, Yoko Nukui, Shu Okugawa, Kyoji Moriya, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Comparison of agar dilution and broth microdilution methods for Clostridium difficile antimicrobial susceptibility testing. J Glob Antimicrob Resist. 2016.12; 43-45. ( PubMed, DOI )

  46. Shinji Ogihara, Ryoichi Saito, Etsuko Sawabe, Michio Hagihara, Shuji Tohda. First Japanese case of infectious endocarditis due to Enterococcus faecalis small-colony variants. J. Infect. Chemother. 2016.10; 22 (10): 716-719. ( PubMed, DOI )

  47. Kageto Yamada, Machiko Kashiwa, Katsumi Arai, Noriyuki Nagano, Ryoichi Saito. Comparison of the Modified-Hodge test, Carba NP test, and carbapenem inactivation method as screening methods for carbapenemase-producing Enterobacteriaceae. J. Microbiol. Methods. 2016.09; 128 48-51. ( PubMed, DOI )

  48. Kazuhito Yuhashi, Yuka Yagihara, Yoshiki Misawa, Tomoaki Sato, Ryoichi Saito, Shu Okugawa, Kyoji Moriya. Diagnosing Clostridium difficile-associated diarrhea using enzyme immunoassay: the clinical significance of toxin negativity in glutamate dehydrogenase-positive patients. Infect Drug Resist. 2016.05; 9 93-99. ( PubMed, DOI )

  49. Yoko Ida, Hiroaki Ohnishi, Kouji Araki, Ryoichi Saito, Shin Kawai, Takashi Watanabe. Efficient management and maintenance of ultrasonic nebulizers to prevent microbial contamination. World J Methodol. 2016.03; 6 (1): 126-132. ( PubMed, DOI )

  50. Hiroe Ohno, Jun-Ichi Wachino, Ryoichi Saito, Wanchun Jin, Keiko Yamada, Kouji Kimura, Yoshichika Arakawa. A highly macrolide-resistant Campylobacter jejuni strain with rare A2074T mutations in 23S rRNA genes. Antimicrob. Agents Chemother. 2016.03; 60 (4): 2580-2581. ( PubMed, DOI )

  51. Yumi Sakakibara, Yoshio Ohtani, Torahiko Jinta, Toshihide Fujie, Yasunari Miyazaki, Naohiko Inase, Ryoichi Saito, Miho Akaza, Tetsuo Sasano, Yuki Sumi. Concentrations of Immunoglobulin G Antibodies Against Pertussis Toxin Does Not Decrease Over a Long Period of Time in Japan. Intern. Med. 2016; 55 3257-3263. ( PubMed, DOI )

  52. Takahito Nei, Akiko Sato, Kazunari Sonobe, Yoshihiko Miura, Kenji Takahashi, Ryoichi Saito. Streptobacillus moniliformis bacteremia in a rheumatoid arthritis patient without a rat bite: a case report. BMC Res Notes. 2015.11; 8 (1): 694. ( PubMed, DOI )

  53. Takahito Nei, Kazunari Sonobe, Asaka Onodera, Toshikazu Itabashi, Hiroki Yamaguchi, Miho Maeda, Ryoichi Saito. Two cases with bacteremia suspected to be due to relatively rare Pseudomonas (Flavimonas) oryzihabitans. J. Infect. Chemother.. 2015.10; 21 (10): 751-755. ( PubMed, DOI )

  54. Ryoichi Saito, Yuta Miharu, Shiho Matsuoka, Shotaro Nonaka, Yuji Fujinami, Noboru Okamura. The outer membrane protein CD is associated with resistance to penicillins in Moraxella catarrhalis. J Glob Antimicrob Resist. 2015.09; 3 (3): 224-225. ( PubMed, DOI )

  55. Ryoichi Saito, Ayako Kasai, Shinji Ogihara, Kageto Yamada, Kazuyuki Tao. Rapid assay of A2058T-mutated 23S rRNA allelic profiles associated with high-level macrolide resistance in Moraxella catarrhalis. J. Med. Microbiol.. 2015.09; 64 (9): 990-992. ( PubMed, DOI )

  56. Ayako Kasai, Shinji Ogihara, Kageto Yamada, Yumiko Tanimichi, Hiroyuki Nishiyama, Ryoichi Saito. Prevalence and molecular analysis of macrolide-resistant Moraxella catarrhalis clinical isolates in Japan, following emergence of the highly macrolide-resistant strain NSH1 in 2011. J. Med. Microbiol.. 2015.07; 64 (7): 708-713. ( PubMed, DOI )

  57. Shinji Ogihara, Ryoichi Saito, Teru Akikura, Akiko Iwama, Yukari Adachi, Daiki Kaji, Kyoka Kakinuma, Hiroshi Takahashi. Characterization of Mucoid and Non-Mucoid Streptococcus pneumoniae Isolated From Outpatients. Annals of laboratory medicine. 2015.07; 35 (4): 410-415. ( PubMed, DOI )

  58. Kuwata Yusuke, Tanimoto Shina, Sawabe Etsuko, Shima Mari, Takahashi Yutaka, Ushizawa Hiroto, Fujie Toshihide, Koike Ryuji, Tojo Naoko, Kubota Tetsuo, Saito Ryoichi. Molecular epidemiology and antimicrobial susceptibility of Clostridium difficile isolated from a university teaching hospital in Japan. Eur J Clin Microbiol Infect Dis. 2015.04; 34 (4): 763-772. ( PubMed, DOI )

  59. Ryoichi Saito, Saho Koyano, Misato Dorin, Yoshimi Higurashi, Yoshiki Misawa, Noriyuki Nagano, Takamasa Kaneko, Kyoji Moriya. Evaluation of a simple phenotypic method for the detection of carbapenemase-producing Enterobacteriaceae. J. Microbiol. Methods. 2015.01; 108 45-48. ( PubMed, DOI )

  60. Saho Koyano, Keita Tatsuno, Mitsuhiro Okazaki, Kiyofumi Ohkusu, Takashi Sasaki, Ryoichi Saito, Shu Okugawa, Kyoji Moriya. A Case of Liver Abscess with Desulfovibrio desulfuricans Bacteremia. Case Rep Infect Dis. 2015; 2015 354168. ( PubMed, DOI )

  61. Kageto Yamada, Ryoichi Saito. Molecular analysis of low-level fluoroquinolone resistance in clinical isolates of Moraxella catarrhalis. J. Med. Microbiol.. 2014.08; 63 (Pt 8): 1066-1070. ( PubMed, DOI )

  62. Ryoichi Saito, Rieko Takahashi, Etsuko Sawabe, Saho Koyano, Yutaka Takahashi, Mari Shima, Hiroto Ushizawa, Toshihide Fujie, Naoki Tosaka, Yuko Kato, Kyoji Moriya, Shuji Tohda, Naoko Tojo, Ryuji Koike, Tetsuo Kubota. First report of KPC-2 Carbapenemase-producing Klebsiella pneumoniae in Japan. Antimicrob. Agents Chemother.. 2014.05; 58 (5): 2961-2963. ( PubMed, DOI )

  63. Shotaro Nonaka, Kosuke Matsuzaki, Tomoya Kazama, Hiroyuki Nishiyama, Yoko Ida, Saho Koyano, Kazunari Sonobe, Noboru Okamura, Ryoichi Saito. Antimicrobial susceptibility and mechanisms of high-level macrolide resistance in clinical isolates of Moraxella nonliquefaciens. J. Med. Microbiol.. 2014.02; 63 (Pt 2): 242-247. ( PubMed, DOI )

  64. Ryoichi Saito, Shotaro Nonaka, Yuji Fujinami, Shiho Matsuoka, Shinichi Nakajima, Hiroyuki Nishiyama, Noboru Okamura. The frequency of BRO β-lactamase and its relationship to antimicrobial susceptibility and serum resistance in Moraxella catarrhalis. J. Infect. Chemother.. 2014.01; 20 (1): 6-8. ( PubMed, DOI )

  65. Uetera Yushi, Kishii Kozue, Yasuhara Hiroshi, Kumada Naohito, Moriya Kyoji, Saito Ryoichi, Okazaki Mitsuhiro, Misawa Yoshiki, Kawamura Kunio. A 5 year longitudinal study of water quality for final rinsing in the single chamber washer-disinfector with a reverse osmosis plant. PDA J Pharm Sci Technol. 2013.07; 67 (4): 399-411. ( PubMed, DOI )

  66. Saito Ryoichi, Matsuoka Shiho, Fujinami Yuji, Nonaka Shotaro, Ichinose Shizuko, Kubota Tetsuo, Okamura Noboru. Role of Moraxella catarrhalis outer membrane protein CD in bacterial cell morphology and autoaggregation. Res Microbiol. 2013.04; 164 (3): 236-243. ( PubMed, DOI )

  67. Koyano Saho, Saito Ryoichi, Nagai Ran, Tatsuno Keita, Okugawa Shu, Okamura Noboru, Moriya Kyoji. Molecular characterization of carbapenemase-producing clinical isolates of Enterobacteriaceae in a teaching hospital, Japan. J Med Microbiol. 2013.03; 62 (Pt 3): 446-450. ( PubMed, DOI )

  68. Nei Takahito, Inai Shunta, Mikami Iwao, Sato Akira, Okamoto Junichi, Yokoshima Kazuhiko, Nakamizo Munenaga, Haraguchi Shuji, Sonobe Kazunari, Saito Ryoichi. Descending necrotizing mediastinitis associated with Lactobacillus plantarum. BMC Infect Dis. 2013; 13 398. ( PubMed, DOI )

  69. Nei Takahito, Akutsu Koichi, Shima Ayaka, Tsuboi Ippei, Suzuki Hiroomi, Yamamoto Takeshi, Tanaka Keiji, Shinoyama Akihiro, Kojima Yoshiko, Washio Yohei, Okawa Sakina, Sonobe Kazunari, Norose Yoshihiko, Saito Ryoichi. A case of streptococcal toxic shock syndrome due to Group G streptococci identified as Streptococcus dysgalactiae subsp. equisimilis. J Infect Chemother. 2012.12; 18 (6): 919-924. ( PubMed, DOI )

  70. Saito Ryoichi, Nonaka Shotaro, Nishiyama Hiroyuki, Okamura Noboru. Molecular mechanism of macrolide-lincosamide resistance in Moraxella catarrhalis. J Med Microbiol. 2012.10; 61 (Pt 10): 1435-1438. ( PubMed, DOI )

  71. Saito Ryoichi, Shimosawa Tatsuo, Ogihara Takehide, Maruyama Naoki, Fujita Toshiro, Okamura Noboru, Nakahara Kazuhiko. Function of adrenomedullin in inflammatory response of liver against LPS-induced endotoxemia. APMIS. 2012.09; 120 (9): 706-711. ( PubMed, DOI )

  72. Nei Takahito, Hyodo Hideya, Sonobe Kazunari, Dan Kazuo, Saito Ryoichi. First report of infectious pericarditis due to Bordetella holmesii in an adult patient with malignant lymphoma. J Clin Microbiol. 2012.05; 50 (5): 1815-1817. ( PubMed, DOI )

  73. Nishiyama Hiroyuki, Saito Ryoichi, Chida Toshio, Sano Kazumitsu, Tsuchiya Tatsuyuki, Okamura Noboru. Nutrient agar with sodium chloride supplementation for presumptive detection of Moraxella catarrhalis in clinical specimens. J Infect Chemother. 2012.04; 18 (2): 219-227. ( PubMed, DOI )

  74. Uetera Y, Kishii K, Yasuhara H, Kumada N, Moriya K, Saito R, Okazaki M. Evaluation of water quality in a single chamber washer-disinfector equipped with a reverse osmosis plant. 2012.01; 20 (1): 44-55.

  75. Nagai Ran, Saito Ryoichi, Koyano Saho, Okamura Noboru, Yokota Hiromitsu, Kitazawa Takatoshi, Moriya Kyoji. Evaluation of multiplex PCR using dual-priming oligonucleotide for the detection of vanA and vanB in vancomycin-resistant enterococci. Clin Chem Lab Med. 2011.04; 49 (4): 751-752. ( PubMed, DOI )

  76. Nakamura Y, Kamachi K, Toyoizumi-Ajisaka H, Otsuka N, Saito R, Tsuruoka J, Katsuta T, Nakajima N, Okada K, Kato T, Arakawa Y. Marked difference between adults and children in Bordetella pertussis DNA load in nasopharyngeal swabs. Clin Microbiol Infect. 2011.03; 17 (3): 365-370. ( PubMed, DOI )

  77. Uetera Y, Yasuhara H, Kumada N, Moriya K, Saito R, Okazaki M. Performance of a new type of containers equipped with reusable filters investigated using wireless loggers and microbiological methods. Central Service. 2011.01; 19 105-116.

  78. Saito R, Koyano S, Nagai R, Okamura N, Moriya K, Koike K. Evaluation of a chromogenic agar medium for the detection of extended-spectrum ss-lactamase-producing Enterobacteriaceae. Lett Appl Microbiol. 2010.12; 51 (6): 704-706. ( PubMed, DOI )

  79. Uetera Yushi, Kawamura Kunio, Kobayashi Hiroyoshi, Saito Yuhei, Yasuhara Hiroshi, Saito Ryoichi. Studies on Viral Disinfection: An Evaluation of Moist Heat Disinfection for HBV by Using A0 Concept Defined in ISO 15883-Washer-Disinfectors. PDA J Pharm Sci Technol. 2010.07; 64 (4): 327-336. ( PubMed )

  80. Ode Takashi, Saito Ryoichi, Kumita Wakako, Sato Kenya, Okugawa Shu, Moriya Kyoji, Koike Kazuhiko, Okamura Noboru. Analysis of plasmid-mediated multidrug resistance in Escherichia coli and Klebsiella oxytoca isolates from clinical specimens in Japan. Int J Antimicrob Agents. 2009.10; 34 (4): 347-350. ( PubMed, DOI )

  81. Saito R, Uetera Y, Saito Y, Okamura N, Moriya K, Koike K. Evaluation of the efficacy of a low temperature steam and formaldehyde steriliser by using biological indicators. J Hosp Infect. 2009.10; 73 (2): 179-180. ( PubMed, DOI )

  82. Qiu Hongli, Kumita Wakako, Sato Kenya, Nakajima Shinichi, Nishiyama Hiroyuki, Saito Ryoichi, Sawabe Etsuko, Ono Emi, Chida Toshio, Okamura Noboru. uspA1 of Moraxella catarrhalis clinical isolates in Japan and its relationship with adherence to HEp-2 cells. J Med Dent Sci. 2009.03; 56 (1): 61-67. ( PubMed )

  83. Kumita Wakako, Saito Ryoichi, Sato Kenya, Ode Takashi, Moriya Kyoji, Koike Kazuhiko, Chida Toshio, Okamura Noboru. Molecular characterizations of carbapenem and ciprofloxacin resistance in clinical isolates of Pseudomonas putida. J Infect Chemother. 2009.02; 15 (1): 6-12. ( PubMed, DOI )

  84. Bakeli Gulibahaer, Sato Kenya, Kumita Wakako, Saito Ryoichi, Ono Emi, Chida Toshio, Okamura Noboru. Antimicrobial susceptibility and mechanism of quinolone resistance in Campylobacter jejuni strains isolated from diarrheal patients in a hospital in Tokyo. J Infect Chemother. 2008.10; 14 (5): 342-348. ( PubMed, DOI )

  85. Uetera Y, Saito Y, Ide K, Yssuhara H, Kumada N, Saito R. Investigation of “prion” chemical indicators in the prevacuum autoclave using a wireless logger system. Central Service. 2008; 16 372-376.

  86. Uetera Y, Saito Y, Ide K, Yssuhara H, Kumada N, Saito R, Takahashi O. Reduced water supply to the water ring vacuum pump. Central Service. 2008; 16 182-185.

  87. Saito R, Okugawa S, Kumita W, Sato K, Chida T, Okamura N, Moriya K, Koike K. Clinical epidemiology of ciprofloxacin-resistant Proteus mirabilis isolated from urine samples of hospitalised patients. Clin Microbiol Infect. 2007.12; 13 (12): 1204-1206. ( PubMed, DOI )

  88. Misawa Yoshiki, Yoshida Atsushi, Saito Ryoichi, Yoshida Honami, Okuzumi Katsuko, Ito Nobue, Okada Mitsumasa, Moriya Kyoji, Koike Kazuhiko. Application of loop-mediated isothermal amplification technique to rapid and direct detection of methicillin-resistant Staphylococcus aureus (MRSA) in blood cultures. J Infect Chemother. 2007.06; 13 (3): 134-140. ( PubMed, DOI )

  89. Saito Ryoichi, Kumita Wakako, Sato Kenya, Chida Toshio, Okamura Noboru, Moriya Kyoji, Koike Kazuhiko. Detection of plasmid-mediated quinolone resistance associated with qnrA in an Escherichia coli clinical isolate producing CTX-M-9 beta-lactamase in Japan. Int J Antimicrob Agents. 2007.05; 29 (5): 600-602. ( PubMed, DOI )

  90. Saito Ryoichi, Sato Kenya, Kumita Wakako, Inami Natsuko, Nishiyama Hiroyuki, Okamura Noboru, Moriya Kyoji, Koike Kazuhiko. Role of type II topoisomerase mutations and AcrAB efflux pump in fluoroquinolone-resistant clinical isolates of Proteus mirabilis. J Antimicrob Chemother. 2006.09; 58 (3): 673-677. ( PubMed, DOI )

  91. Saito Ryoichi, Misawa Yoshiki, Moriya Kyoji, Koike Kazuhiko, Ubukata Kimiko, Okamura Noboru. Development and evaluation of a loop-mediated isothermal amplification assay for rapid detection of Mycoplasma pneumoniae. J Med Microbiol. 2005.11; 54 (Pt 11): 1037-1041. ( PubMed, DOI )

  92. Ryoichi Saito, Hiromitsu Yokota, Emiko Takahashi, Fumiko Mashige, Akiko Yoneyama, Kazuhiko Nakahara, Noboru Okamura. Performance of an automated system for quantitation of hepatitis C virus core antigen. J. Virol. Methods. 2003.09; 112 (1-2): 93-97. ( PubMed, DOI )

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Conference Activities & Talks 【 display / non-display 】

  1. Ayaha Suzuki, Isaac Prah, Yusuke Ota, Samiratu Mahazu, Mitsunori Yoshida, Masato Suzuki, Yoshihiko Hoshino, Toshihiko Suzuki, Anthony Ablordy, Ryoichi Saito. Phenotypic and genotypic characterization of carbapenemase producers from hospital sewage in Ghana. The International Union of Microbiological Societies 2024 2024.10.25 Florence, Italy

  2. Yusuke Ota, Fei Chen, Isaac Prah, Samiratu Mahazu, Kimiyo Watanabe, Tomoko Oda, Teruaki Kinoshita, Yoshiaki Gu, Yoko Nukui, Ryoichi Saito. Integrated metagenomic and metatranscriptomic analysis reveals actively expressed antimicrobial-resistant genes and their hosts in hospital wastewater. The International Union of Microbiological Societies 2024 2024.10.25 Florence, Italy

  3. Tomoko Oshiro, Yusuke Ota, Hideki Takahashi, Ryoichi Saito. Functional characterization of polyphosphates in Neisseria meningitidis. The Asian Society for Clinical Pathology and Laboratory Medicine 2024 2024.09.27 Seoul, Korea

  4. Frederick Ofosu Appiah, Samiratu Mahazu, Isaac Prah, Yusuke Ota, Yohei Nishikawa, Mitsunori Yoshida, Masato Suzuki, Yoshihiko Hoshino, Toshihiko Suzuki, Tomoko Ishino, Anthony Ablordy, Ryoichi Saito. Emergence of meropenem-resistant blaPOM-1 producing Pseudomonas otitidis isolated from a river water in Ghana. The Asian Society for Clinical Pathology and Laboratory Medicine 2024 2024.09.27 Seoul, Korea

  5. Nanako Minami, Yusuke Ota, Hideki Takahashi, Ryoichi Saito. Genetic characteristics evolving ciprofloxacin resistance in Neisseria meningitidis. The Asian Society for Clinical Pathology and Laboratory Medicine 2024 2024.09.27 Seoul, Korea

  6. Y Nukui, C Yamamoto, K Furukawa, T Inaba, R Saito, Y Ota, K Aoki, Y Ishii, R Koike. Molecular Epidemiological Analysis of Multidrug-Resistant Achromobacter xylosoxidans that Caused an Outbreak in Japan. AMS Microbe 2024 2024.06.13 Atlanta, GA

  7. Y Nukui, C Yamamoto, T Inaba, Y Aiso, J Nakajima, S Kanehira, K Sonobe, S Tohda, Y Ota, and R Saito. Genetic Analysis of Antimicrobial Resistant Enterobacteriaceae in Travelers and Patients Who Were Treated Overseas . AMS Microbe 2023 2023.06.15 Houston, TX

  8. Yusuke Ota, Isaac Prah, Samiratu Mahazu, Yoshiaki Gu, Ryuji Koike, Ryoichi Saito. Molecular characterization of blaGES-encoding plasmids from hospital sewage in Japan. The 33rd European Congress of Clinical Microbiology & Infectious Diseases 2023.04 Copenhagen, Denmark

  9. Miho Matsuba, Yusuke Ota, Samiratu Mahazu, Isaac Prah, Hideyuki Takahashi, Ryoichi Saito. Development of a rapid and simple assay for identification and serotyping of Neisseria meningitidis. The 33rd European Congress of Clinical Microbiology & Infectious Diseases 2023.04 Copenhagen, Denmark

  10. Taira Kawamura, Akari Samejima, Yukino Usui, Isaac Prah, Samiratu Mahazu, Yusuke Ota, Ryoichi Saito. Loss of GdpP function leads to reduced vancomycin susceptibility in Clostridioides difficile. The 33rd European Congress of Clinical Microbiology & Infectious Diseases 2023.04 Copenhagen, Denmark

  11. Samiratu Mahazu, Isaac Prah, Yusuke Ota, Takaya Hayashi, Masato Suzuki, Yoshihiko Hoshino, Yukihiro Akeda, Toshihiko Suzuki, Tomoko Ishino, Anthony Ablordey, Ryoichi Saito. Chromosomal mcr-3-related lipid A phosphoethanolamine transferases conferring colistin resistance in Aeromonas species from river water samples. The 33rd European Congress of Clinical Microbiology & Infectious Diseases 2023.04 Copenhagen, Denmark

  12. Isaac Prah, Ayaha Suzuki, Samiratu Mahazu, Yusuke Ota, Anthony Ablordy, Ryoichi Saito. Molecular characterization of carbapenem resistant isolates from hospital sewage samples in Ghana. 第34回日本臨床微生物学会総会・学術集会 2023.02.04 横浜

  13. Samiratu Mahazu, Isaac Prah, Yusuke Ota, Takaya Hayashi, Yoko Nukui, Masato Suzuki, Yoshihiko Hoshino, Yukihiro Akeda, Toshihiko Suzuki, Tomoko Ishino, Anthony Ablordey, Ryoichi Saito. Genetic analysis of carbapenemase-producing Enterobacter cloacae and Klebsiella species . 第34回日本臨床微生物学会総会・学術集会 2023.02.04 横浜

  14. Yikeshan Yalikun, Isaac Prah, Samiratu Mahazu, Yusuke Ota, Ryoichi Saito. Genomic and population insight of ESBL-producing Klebsiella pneumoniae from Ghana. 第34回日本臨床微生物学会総会・学術集会 2023.02.03 横浜

  15. Samiratu Mahazu, Isaac Prah, Yusuke Ota, Takaya Hayashi, Yoko Nukui, Masato Suzuki, Yoshihiko Hoshino, Yukihiro Akeda, Toshihiko Suzuki, Tomoko Ishino, Anthony Ablordey, Ryoichi Saito. Klebsiella species and Enterobacter cloacae isolates harbouring blaOXA-181 and blaOXA-48: resistome, fitness cost, and plasmid stability.. The 17th Congress of Asian Society for Clinical Pathology and Laboratory Medicine 2022.10.09 Hyogo, Japan

  16. Yusuke Ota, Reina Okada, Hideyuki Takahashi, Ryoichi Saito. Rapid and simple PCR-RFLP assay for detecting a mutation at codon 91 of gyrA in Neisseria meningitidis.. The 17th Congress of Asian Society for Clinical Pathology and Laboratory Medicine 2022.10.09 Hyogo, Japan

  17. Taira Kawamura, Akari Samejima, Yukino Usui, Issac Prah, Samiratu Mahazu, Yusuke Ota, Ryoichi Saito. Role of cyclic-di-AMP phosphodiesterase on vancomycin susceptibility and growth in Clostridioides difficile.. The 17th Congress of Asian Society for Clinical Pathology and Laboratory Medicine 2022.10.09 Hyogo, Japan

  18. Kayo Yamada, Alafate Ayibieke, Samiratu Mahazu, Isaac Prah, Yusuke Ota, Yoko Nukui, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Genetic and phenotypic features of Staphylococcus epidermidis ST2 bloodstream isolates from Tokyo.. The 17th Congress of Asian Society for Clinical Pathology and Laboratory Medicine 2022.10.09 Hyogo, Japan

  19. Yikeshan Yalikun, Isaac Prah, Samiratu Mahazu, Yusuke Ota, Anthony Ablordey, Ryoichi Saito. Characterization of extended-spectrum β-lactamase producing Klebsiella pneumoniae from Ghana.. The 17th Congress of Asian Society for Clinical Pathology and Laboratory Medicine 2022.10.09 Hyogo, Japan

  20. Isaac Prah, Yoko Nukui, Ryoichi Saito. Molecular Profiling of New Delhi Metallo- β-lactamase 5 producing Klebsiella oxytoca strain in Japan. AMS Microbe 2022 2022.06.11 Washington, DC

  21. Kayo Yamada, Alafate Ayibieke, Samiratu Mahazu, Isaac Prah, Yusuke Ota, Yoko Nukui, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Novel insights and genetic features of Staphylococcus epidermidis bloodstream isolates from Tokyo. AMS Microbe 2022 2022.06.11 Washington, DC

  22. Samiratu Mahazu, Isaac Prah, Yusuke Ota, Takaya Hayashi, Yoko Nukui, Yukihiro Akeda, Toshihiko Suzuki, Tomoko Ishino, Anthony Ablordey, Ryoichi Saito. Molecular characterization of Klebsiella pneumoniae and Enterobacter cloacae isolates harboring blaOXA-181 and blaOXA-48. AMS Microbe 2022 2022.06.11 Washington, DC

  23. Y Nukui, Y Ota, I Prah, R Saito, Y Aiso, M Sugii, S Kanehira, J Nakajima, K Sonobe, S Tohda, R Koike, Y Gu. Molecular Epidemiological Analysis of Third Generation Cephalosporin and Piperacillin/Tazobactam-Resistant Klebsiella oxytoca, Which Caused an Outbreak in a COVID-19 Intensive Care Unit. AMS Microbe 2022 2022.06.10 Washington, DC

  24. Isaac Prah, Alafate Ayibieke, Samiratu Mahazu, Chihiro Tani Sassa, Takaya Hayashi, Toshihiko Suzuki, Shiroh Iwanaga, Shoji Yamaoka, Anthony Ablordey, Ryoichi Saito. Emergence of Oxacillinase-181Carbapenemase-producing Diarrheagenic Escherichia coli in Ghana. World Microbe Forum 2021 2021.06.20

  25. Samiratu Mahazu, Wakana Sato, Alafate Ayibieke, Isaac Prah, Takaya Hayashi, Toshihiko Suzuki, Shiroh Iwanaga, Anthony Ablordey, Ryoichi Saito. Genetic Features of Extended-spectrum Beta-lactamase Producing Escherichia coli from TwoHospitals in Ghana. World Microbe Forum 2021 2021.06.20

  26. Alafate Ayibieke, Kayo Yamada, Kageto Yamada, Shinji Ogihara, Yoshibumi Aiso, Yoshiro Hadano, Yoko Nukui, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Molecular characterization of S. epidermidis bloodstream isolates from two hospitals in Tokyo. 第32回日本臨床微生物学会総会 2021.01.29 東京

  27. Isaac Prah, Alafate Ayibieke, Samiratu Mahazu, Chihiro Tani Sassa, Takaya Hayashi, Toshihiko Suzuki, Shiroh Iwanaga, Shoji Yamaoka, Anthony Ablordey, Ryoichi Saito. Whole-genome characterization of OXA-181 carbapenemase producing Escherichia coli from diarrheic patients in Ghana. 第32回日本臨床微生物学会総会 2021.01.29 東京

  28. Yuta Okada, Shu Okugawa, Mahoko Ikeda, Tatsuya Kobayashi, Ryoichi Saito, Yoshimi Higurashi, Kyoji Moriya.. Genetic diversity and Epidemiology of Accessory Gene Regulator Loci in the Clinical Isolates of Clostridioides difficile. ASM Microbe 2020 2020.06.18 Chicago, IL, USA

  29. Y. Nukui, R. Saito, K. Aoki, Y. Ishii, Y. Aiso, M. Shima, K. Sonobe, S. Tohda, R. Koike.. Molecular Epidemiological Analysis of Multidrug-Resistant Achromobacter xylosoxidans that Caused an Outbreak in Japan. ASM Microbe 2020 2020.06.18 Chicago, IL, USA

  30. Ryoichi Saito, Alafate Ayibieke, Ayumi Kobayashi, Samiratu Mahazu, Wakana Sato, Isaac Prah, John Addow-Thompson, Shiroh Iwanaga, Anthony Ablordy. Antibiotic resistance among Gram-negative glucose non-fermenting bacilli from Ghana. Asian-African Research Forum on Emerging and Reemerging Infections 2019 2019.09.05 Sapporo, Japan

  31. Y. Nukui, Y. Maki, Y. Hadano, Y. Aiso, J. Nakajima, K. Sonobe, R. Saito, S. Tohda, R. Koike. Molecular Epidemiological Analysis of Multidrug-Resistant Pseudomonas aeruginosa that Caused an Outbreak in an Intensive Care Unit in Japan. ASM Microbe 2019 2019.06.20 San Francisco, CA, USA

  32. Yuta Okada, Yuka Yagihara, Yoshitaka Wakabayashi, Gene Igawa, Ryoichi Saito, Yoshimi Higurashi, Mahoko Ikeda, Keita Tatsuno, Shu Okugawa, Kyoji Moriya. Clinical features, molecular epidemiology, and virulence-associated genes of Clostridioides difficile isolates in patients at a University Hospital in Japan. ASM Microbe 2019 2019.06.20 San Francisco, CA, USA

  33. Shigeki MISAWA, Mitsuaki NAGASAWA, Hideji YANAGISAWA, Atsushi YUKI, Ryoichi SAITO, Vansith KET, Hironori KATAYAMA, Yoshifumi MIYAZIMA. The Project for Quality Improvement of Clinical Laboratory Testing in Kingdom of Cambodia Standardization and Development of a Clinical Microbiology Testing System. The 6th Congress of the Asia Association of Medical Laboratory Scientists (AAMLS 2019) 2019.05.29 Pattaya, Thailand

  34. Alafate Ayibieke, Ayumi Kobayashi, Samiratu Mahazu, Wakana Sato, Isaac Prah, John Addow-Thompson, Shiroh Iwanaga, Anthony Ablordy, Ryoichi Saito. Antibiotic resistance among Gram-negative glucose non-fermenting bacilli from Ghana. The 23rd IFCC-EFLM European Congress of Clinical Chemistry and Laboratory Medicine 2019.05.19 Barcelona, Spain

  35. Yukino Usui, Yuko Kamiichi, Shu Okugawa, Ryoichi Saito. Impact of deoxycholate on the growth, toxin production, and spore formation of Clostridioides difficile . The 23rd IFCC-EFLM European Congress of Clinical Chemistry and Laboratory Medicine 2019.05.19 Barcelona, Spain

  36. Wakana Sato, Samiratu Mahazu, Isaac Prah, John Addow-Thompson, Alafate Ayibieke, Shiroh Iwanaga, Anthony Ablordy, Ryoichi Saito. Antimicrobial susceptibility and extended-spectrum β-lactamase profiles of Escherichia coli and Klebsiella spp. isolated from Ghana. The 23rd IFCC-EFLM European Congress of Clinical Chemistry and Laboratory Medicine 2019.05.19 Barcelona, Spain

  37. Saud Alanazi, Maryam Alnoman, Saeed Banawas, Ryoichi Saito, Mahfuzur R. Sarker. The inhibitory effects of essential oil constituents against germination, outgrowth and vegetative growth of spores of Clostridium perfringens type A in laboratory medium and chicken meat. ASM Microbe 2018 2018.06.07 Atlanta, GA, USA

  38. Y. Nukui, Y. Aiso, T. Chino, R. Saito, C. Tani, J. Nakajima, K. Sonobe, S. Tohda, R. Koike. Molecular epidemiological analysis of Clostridium difficile that caused an outbreak in a Japanese hospital . ASM Microbe 2018 2018.06.07 Atlanta, GA, USA

  39. Ayaka Ohta, Ayako Kasai, Yuina Maeda, Kageto Yamada, Ryoichi Saito. Genetic profile in the development of macrolide resistance in Moraxella catarrhalis. ASM Microbe 2018 2018.06.07 Atlanta, GA, USA

  40. Alafate Ayibieke, Miyuki Mizoguchi, Kageto Yamada, Tomoaki Sato, Chino Takashi, Yoshibumi Aiso, Toshihide Fujie, Yoko Nukui, Kyoji Moriya, Ryuji Koike, Shuji Tohda, Ryoichi Saito. Dissemination of qac genes among Staphylococcus epidermidis isolates from a University teaching hospital in Tokyo. ASM Microbe 2018 2018.06.07 Atlanta, GA, USA

  41. Alafate Ayibieke, Wakana Sato, Samiratu Mahazu, Isaac Prah, John Thompson, Chihiro Tani, Mitsuko Ohashi, Shiroh Iwanaga, Toshihiko Suzuki, Anthony Ablordey, Ryoichi Saito. First clinical isolation of NDM-1 carbapenemase-producing Escherichia coli in Ghana. ASM Microbe 2018 2018.06.07 Atlanta, GA, USA

  42. Ryoichi Saito, Prabhat K. Talukdar, Saud S. Alanazi, Mahfuzur R. Sarker. RelA/DTD-mediated regulation of spore formation and toxin production by Clostridium perfringens type A strain SM101. ASM Microbe 2018 2018.06.07 Atlanta, GA, USA

  43. Alafate Ayibieke, Miyuki Mizoguchi, Kageto Yamada, Tomoaki Sato, Kyoji Moriya, Yoshibumi Aiso, Toshihide Fujie, Yoko Nukui, Ryuji Koike, Ryoichi Saito. Tolerance to antiseptics among Staphylococcus epidermidis isolates. The 33rd Annual Meeting of Japanese Society for Infection Prevention and Control 2018.02.23 Tokyo, Japan

  44. Ryoichi Saito, Mahfuzur R. Sarker. Role of RelA and D-tyrosyl-tRNA(Tyr) deacylase for growth, sporulation and toxin production in Clostridium perfringens type A strain SM101. The 29th Annual Meeting of Japanese Society for Clinical Microbiology 2018.02.09 Gifu, Japan

  45. Ryoichi Saito, Mahfuzur R. Sarker. Clostridium perfringens RelA and DTD control sporulation. The 29th World Congress of World Association of Societies of Pathology and Laboratory Medicine 2017.11.15 Kyoto, Japan

  46. Kageto Yamada, Ryoichi Saito, Saori Muto, Machiko Kashiwa, Yoshiko Tamamori, Shingo Fujisaki. Molecular characterization of fluoroquinolone-resistant Moraxella catarrhalis variants generated in vitro by stepwise selection. The 5th congress of the Asia Association of Medical Laboratory Scientists 2017.09.22 Busan, Korea

  47. Makoto Ohnishi, Gene Igawa, Misato Dorin, Ken Shimuta, Ryoichi Saito, Shu-Ichi Nakayama. Donor of mosaic pena gene of ceftriaxone resistant neisseria gonorrhoeae fc428 and gu140106. STI and HIV 2017 World Congress 2017.07.09 Rio de Janeiro, Brazil

  48. Rachaneeporn Tiyawisutsri, Tippawan Muennoo, Ryoichi Saito, Chihiro Tani. Molecular typing of Acinetobacter baumannii clinical isolates from a hospital in Nonthaburi Province, Thailand. The 32nd World Congress of the International Federation of Biomedical Laboratory Science 2016.08.31 Kobe, Japan

  49. Kageto Yamada, Katsumi Arai, Noriyuki Nagano, Ryoichi Saito. Comparison of screening methods for carbapenemase-producing Enterobacteriaceae -Comparison of Modified-Hodge test, Carba NP test, and carbapenem inactivation method-. The 32nd World Congress of the International Federation of Biomedical Laboratory Science 2016.08.31 Kobe, Japan

  50. Gene Igawa, Mika Casey, Etsuko Sawabe, Yoko Nukui, Shu Okugawa, Kyoji Moriya, Shuji Tohda, Ryoichi Saito. Comparison of Clostridium difficile antimicrobial susceptibility testing by agar dilution, broth microdilution, and Etest methods. ASM Microbe 2016 2016.06.16 Boston, MA, USA

  51. Y Nukui, T Chino, R Saito, C Tani, G Igawa, Y Kamiichi, A Kasai, S Ogihara, E Sawabe, S Tohda, R Koike. Clinical and bacterial characterization of nosocomial Clostridium difficile infection among children in Japan. ASM Microbe 2016 2016.06.16 Boston, MA, USA

  52. Kageto Yamada, Machiko Kashiwa, Katsumi Arai, Ryoichi Saito. Antimicrobial susceptibility to β-lactam antibiotics and the production of BRO β-lactamase in clinical isolates of Moraxella catarrhalis from a Japanese hospital; Does BRO inactivate ceftriaxone? . ASM Microbe 2016 2016.06.16 Boston, MA, USA

  53. Shinji Ogihara, Ryoichi Saito, Yuka Kitamura, Etsuko Sawabe, Takahiro Kozakai, Mari Shima, Yoko Nukui, Michio Hagihara, Shuji Tohda. Molecular Typing for Methicillin-resistant Staphylococcus aureus: Comparison Between PCR-Based Open Reading Frame Typing, Multilocus Sequence Typing (MLST), and Staphylococcus Protein A Gene (spa) Typing. ASM Microbe 2016 2016.06.16 Boston, MA, USA

  54. Mihoko Ikeda, Miyuki Mizoguchi, Keita Tatsuno, Ryoichi Saito, Shu Okugawa, Kyoji Moriya. Clinical and Microbiological Characteristics of Klebsiella pneumoniae Pneumonia and Urinary Tract Infection in Japan. 55th Interscience Conference on Antimicrobial Agents and Chemotherapy 2015.09.17 San Diego, SF, USA

  55. Ryoichi Saito,Saho Koyano,Misato Dorin,Yoshimi Higurashi,Yoshiki Misawa,Noriyuki Nagano,Takamasa Kaneko,Kyoji Moriya. A simple phenotypic test for the identification and presumptive characterization of carbapenemases in Enterobacteriaceae. 54th Interscience Conference on Antimicrobial Agents and Chemotherapy 2014.09.07 Washington, D.C., USA

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Awards & Honors 【 display / non-display 】

  • Ogata Tomio Award，College of Laboratory Medicine of Japan，2024.11

  • Taira Kawamura, The Best Biomedical Research Award (Master's Program)，Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University，2024.03

  • Kayo Yamada, The Biomedical Research Award (Master's Program)，Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University，2023.03

  • Usui Yukino, scientific paper award on Japanese association for anaerobic infection research，Japanese association for anaerobic infection research，2022.03

  • Eimi Hasegawa, The Biomedical Research Award (Master's Program)，Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University，2021.03

  • Wakana Sato, The Biomedical Research Award (Master's Program)，Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University，2020.03

  • Medical Research Award 2015，Tokyo Medical and Dental University，2016.01

  • TMDU Award for Excellence in Teaching，Tokyo Medical and Dental University，2014.10

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