Koji Kitajima

626 total citations
17 papers, 347 citations indexed

About

Koji Kitajima is a scholar working on Infectious Diseases, Epidemiology and Neurology. According to data from OpenAlex, Koji Kitajima has authored 17 papers receiving a total of 347 indexed citations (citations by other indexed papers that have themselves been cited), including 12 papers in Infectious Diseases, 5 papers in Epidemiology and 4 papers in Neurology. Recurrent topics in Koji Kitajima's work include COVID-19 Clinical Research Studies (7 papers), Viral gastroenteritis research and epidemiology (4 papers) and SARS-CoV-2 and COVID-19 Research (4 papers). Koji Kitajima is often cited by papers focused on COVID-19 Clinical Research Studies (7 papers), Viral gastroenteritis research and epidemiology (4 papers) and SARS-CoV-2 and COVID-19 Research (4 papers). Koji Kitajima collaborates with scholars based in Japan, Belgium and Croatia. Koji Kitajima's co-authors include Hiroshi Yoshizawa, Akira Tanaka, Yukio Itoh, Makoto Mayumi, Yuzo Miyakawa, Yuzo Miyakawa, Yasuhisa Kuroda, Ken Sasaki, Toru Iwaki and Masaru Shimizu and has published in prestigious journals such as Journal of the American Chemical Society, Gastroenterology and American Heart Journal.

In The Last Decade

Koji Kitajima

15 papers receiving 322 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Koji Kitajima Japan 9 191 164 99 37 33 17 347
Jinfeng Liu China 14 344 1.8× 282 1.7× 71 0.7× 21 0.6× 5 0.2× 58 572
Alfred M. Prince United States 9 290 1.5× 283 1.7× 52 0.5× 8 0.2× 17 0.5× 9 434
Chenliang Zhou China 10 82 0.4× 54 0.3× 108 1.1× 70 1.9× 5 0.2× 32 384
Toyomi MATSUMOTO Japan 11 407 2.1× 451 2.8× 40 0.4× 21 0.6× 21 0.6× 27 564
Chiara Nardi Italy 10 141 0.7× 190 1.2× 78 0.8× 2 0.1× 15 0.5× 20 365
Marinella Portolani Italy 13 245 1.3× 29 0.2× 151 1.5× 4 0.1× 11 0.3× 28 478
Zicheng Jiang China 10 189 1.0× 138 0.8× 68 0.7× 25 0.7× 23 319
Jingna Xun China 13 108 0.6× 44 0.3× 484 4.9× 7 0.2× 16 0.5× 33 738
Vishakha Sabharwal United States 12 157 0.8× 47 0.3× 49 0.5× 6 0.2× 3 0.1× 36 580
Guoping Sheng China 9 53 0.3× 66 0.4× 52 0.5× 11 0.3× 2 0.1× 16 264

Countries citing papers authored by Koji Kitajima

Since Specialization
Citations

This map shows the geographic impact of Koji Kitajima's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koji Kitajima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koji Kitajima more than expected).

Fields of papers citing papers by Koji Kitajima

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koji Kitajima. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koji Kitajima. The network helps show where Koji Kitajima may publish in the future.

Co-authorship network of co-authors of Koji Kitajima

This figure shows the co-authorship network connecting the top 25 collaborators of Koji Kitajima. A scholar is included among the top collaborators of Koji Kitajima based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Koji Kitajima. Koji Kitajima is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

17 of 17 papers shown
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Suzuki, Michiyo, Kayoko Hayakawa, Yusuke Asai, et al.. (2023). Characteristics of hospitalized COVID-19 patients with other respiratory pathogens identified by rapid diagnostic test. Journal of Infection and Chemotherapy. 29(5). 539–545. 1 indexed citations
4.
Asai, Yusuke, Hidetoshi Nomoto, Kayoko Hayakawa, et al.. (2022). Comorbidities as Risk Factors for Severe Disease in Hospitalized Elderly COVID-19 Patients by Different Age-Groups in Japan. Gerontology. 68(9). 1027–1037. 24 indexed citations
5.
Hayakawa, Kayoko, Yusuke Asai, Nobuaki Matsunaga, et al.. (2022). Evaluation of the representativeness of data in the COVID-19 Registry Japan during the first six waves of the epidemic. Global Health & Medicine. 4(4). 204–209. 7 indexed citations
6.
Yamada, Gen, Kayoko Hayakawa, Nobuaki Matsunaga, et al.. (2021). Predicting respiratory failure for COVID-19 patients in Japan: a simple clinical score for evaluating the need for hospitalisation. Epidemiology and Infection. 149. e175–e175. 11 indexed citations
7.
Hara, Hisao, Yukari Uemura, Kayoko Hayakawa, et al.. (2021). Evaluation of the efficacy of anticoagulation therapy in reducing mortality in a nationwide cohort of hospitalized patients with coronavirus disease in Japan. International Journal of Infectious Diseases. 112. 111–116. 2 indexed citations
8.
Sasaki, Ken, et al.. (2002). Light-Harvesting Heptadecameric Porphyrin Assemblies. Journal of the American Chemical Society. 124(7). 1182–1183. 44 indexed citations
9.
Míyake, Shiro, et al.. (1998). Effectiveness of Polyclonal and Monoclonal Antibodies Prepared for an Immunoassay of the Etofenprox Insecticide. Bioscience Biotechnology and Biochemistry. 62(5). 1001–1004. 13 indexed citations
10.
Itoh, Yuta, et al.. (1986). Lack of Detectable Reverse Transcriptase Activity in Human and Chimpanzee Sera with a High Infectivity for Non-A, Non-B Hepatitis. Journal of General Virology. 67(4). 777–779. 8 indexed citations
11.
Yoshizawa, Hiroshi, Yuta Itoh, Koji Kitajima, et al.. (1984). Beta‐Propiolactone for the Inactivation of Non‐A/Non‐B Type 1 Hepatitis Virus Capable of Inducing Cytoplasmic Tubular Ultrastructures in Chimpanzees. Vox Sanguinis. 46(2). 86–91. 6 indexed citations
12.
Naito, Setsuya, Koji Kitajima, & Kikuo Arakawa. (1983). HLA and rheumatic heart disease in Japanese. American Heart Journal. 106(5). 1164–1167. 9 indexed citations
13.
Yoshizawa, Hiroshi, Yukio Itoh, Koji Kitajima, et al.. (1982). Non-A, Non-B (Type 1) Hepatitis Agent Capable of Inducing Tubular Ultrastructures in the Hepatocyte Cytoplasm of Chimpanzees: Inactivation by Formalin and Heat. Gastroenterology. 82(3). 502–506. 44 indexed citations
14.
Yoshizawa, Hiroshi, Yukio Itoh, Koji Kitajima, et al.. (1981). Demonstration of two different types of non-A, non-B hepatitis by reinjection and cross-challenge studies in chimpanzees. Gastroenterology. 81(1). 107–113. 90 indexed citations
15.
Morita, Masashi, et al.. (1981). Glomerulonephritis associated with arteritis in marmosets infected with hepatitis A virus.. PubMed. 62(1). 103–13. 20 indexed citations
16.
Yoshizawa, Hiroshi, Yoshihiro Akahane, Yukio Itoh, et al.. (1980). Viruslike particles in a plasma fraction (fibrinogen) and in the circulation of apparently healthy blood donors capable of inducing non-A/non-B hepatitis in humans and chimpanzees. Gastroenterology. 79(3). 512–520. 59 indexed citations
17.
Oh‐ishi, Sachiko, Akihiro Ueno, Yasuhiro Uchida, et al.. (1979). Fujiwara trait: the first case of kininogen deficiency in Japan.. PubMed. 120B. 93–9. 3 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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