Keisuke Ejima

4.8k total citations
81 papers, 1.1k citations indexed

About

Keisuke Ejima is a scholar working on Epidemiology, Infectious Diseases and Modeling and Simulation. According to data from OpenAlex, Keisuke Ejima has authored 81 papers receiving a total of 1.1k indexed citations (citations by other indexed papers that have themselves been cited), including 30 papers in Epidemiology, 25 papers in Infectious Diseases and 25 papers in Modeling and Simulation. Recurrent topics in Keisuke Ejima's work include COVID-19 epidemiological studies (25 papers), SARS-CoV-2 and COVID-19 Research (13 papers) and Traumatic Brain Injury Research (11 papers). Keisuke Ejima is often cited by papers focused on COVID-19 epidemiological studies (25 papers), SARS-CoV-2 and COVID-19 Research (13 papers) and Traumatic Brain Injury Research (11 papers). Keisuke Ejima collaborates with scholars based in United States, Japan and Singapore. Keisuke Ejima's co-authors include Hiroshi Nishiura, Kazuyuki Aihara, Shingo Iwami, David B. Allison, Kenji Mizumoto, Keisuke Kawata, Yasuhisa Fujita, Kwang Su Kim, Shoya Iwanami and Megan E. Huibregtse and has published in prestigious journals such as Nature Communications, SHILAP Revista de lepidopterología and PLoS ONE.

In The Last Decade

Keisuke Ejima

76 papers receiving 1.0k citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Keisuke Ejima United States	20	352	327	272	201	135	81	1.1k
Junjun Jiang China	21	538 1.5×	584 1.8×	44 0.2×	135 0.7×	100 0.7×	111	1.4k
Walter Mazzucco Italy	19	278 0.8×	214 0.7×	55 0.2×	107 0.5×	36 0.3×	104	1.0k
Rebecca L. Ursin United States	10	190 0.5×	545 1.7×	91 0.3×	144 0.7×	47 0.3×	13	1.1k
Florian Kurth Germany	23	207 0.6×	854 2.6×	115 0.4×	394 2.0×	43 0.3×	82	2.0k
Nayer Khazeni United States	14	213 0.6×	76 0.2×	81 0.3×	65 0.3×	311 2.3×	20	819
Jacob E. Simmering United States	18	298 0.8×	191 0.6×	33 0.1×	66 0.3×	188 1.4×	41	1.2k
Boris P. Hejblum France	13	182 0.5×	176 0.5×	28 0.1×	99 0.5×	81 0.6×	33	879
Fulvio Adorni Italy	28	519 1.5×	805 2.5×	31 0.1×	215 1.1×	416 3.1×	86	2.4k
Amy L. Davidow United States	24	767 2.2×	855 2.6×	26 0.1×	147 0.7×	126 0.9×	70	1.9k

Countries citing papers authored by Keisuke Ejima

Since Specialization

Citations

This map shows the geographic impact of Keisuke Ejima'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 Keisuke Ejima with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Keisuke Ejima more than expected).

Fields of papers citing papers by Keisuke Ejima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Keisuke Ejima. 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 Keisuke Ejima. The network helps show where Keisuke Ejima may publish in the future.

Co-authorship network of co-authors of Keisuke Ejima

This figure shows the co-authorship network connecting the top 25 collaborators of Keisuke Ejima. A scholar is included among the top collaborators of Keisuke Ejima 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 Keisuke Ejima. Keisuke Ejima is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Ejima, Keisuke, Yuqian Wang, Akira Endo, et al.. (2025). Evaluating the effectiveness of international travel controls to identify MPXV-infected travelers: a simulation study. BMC Medicine. 23(1). 473–473.

Bazarian, Jeffrey J., Kyle Kercher, Rebekah Mannix, et al.. (2023). Longitudinal Associations of Clinical and Biochemical Head Injury Biomarkers With Head Impact Exposure in Adolescent Football Players. JAMA Network Open. 6(5). e2316601–e2316601. 9 indexed citations

Ejima, Keisuke, Kwang Su Kim, Shoya Iwanami, et al.. (2022). Designing isolation guidelines for COVID-19 patients with rapid antigen tests. Nature Communications. 13(1). 4910–4910. 19 indexed citations

Chusyd, Daniella E., Steven N. Austad, Stephanie Dickinson, et al.. (2022). Randomization, design and analysis for interdependency in aging research: no person or mouse is an island. Nature Aging. 2(12). 1101–1111. 2 indexed citations

Unnikrishnan, Archana, Karla P. Garrett, David B. Allison, et al.. (2021). Reevaluation of the effect of dietary restriction on different recombinant inbred lines of male and female mice. Aging Cell. 20(11). e13500–e13500. 15 indexed citations

Ejima, Keisuke, Yoshiki Koizumi, Nao Yamamoto, et al.. (2021). HIV Testing by Public Health Centers and Municipalities and New HIV Cases During the COVID-19 Pandemic in Japan. JAIDS Journal of Acquired Immune Deficiency Syndromes. 87(2). e182–e187. 32 indexed citations

Ejima, Keisuke, Kwang Su Kim, Christina Ludema, et al.. (2021). Estimation of the incubation period of COVID-19 using viral load data. Epidemics. 35. 100454–100454. 39 indexed citations

Ejima, Keisuke, Kwang Su Kim, Shoya Iwanami, et al.. (2021). Revisiting the guidelines for ending isolation for COVID-19 patients. eLife. 10. 16 indexed citations

Chusyd, Daniella E., Steven N. Austad, Andrew W. Brown, et al.. (2021). From Model Organisms to Humans, the Opportunity for More Rigor in Methodologic and Statistical Analysis, Design, and Interpretation of Aging and Senescence Research. The Journals of Gerontology Series A. 77(11). 2155–2164. 4 indexed citations

10.

Ejima, Keisuke, Kwang Su Kim, Shoya Iwanami, et al.. (2021). Time variation in the probability of failing to detect a case of polymerase chain reaction testing for SARS-CoV-2 as estimated from a viral dynamics model. Journal of The Royal Society Interface. 18(177). 20200947–20200947. 7 indexed citations

11.

Iwanami, Shoya, Keisuke Ejima, Kwang Su Kim, et al.. (2021). Detection of significant antiviral drug effects on COVID-19 with reasonable sample sizes in randomized controlled trials: A modeling study. PLoS Medicine. 18(7). e1003660–e1003660. 30 indexed citations

12.

Kim, Kwang Su, Keisuke Ejima, Shoya Iwanami, et al.. (2021). A quantitative model used to compare within-host SARS-CoV-2, MERS-CoV, and SARS-CoV dynamics provides insights into the pathogenesis and treatment of SARS-CoV-2. PLoS Biology. 19(3). e3001128–e3001128. 88 indexed citations

13.

Yoneoka, Daisuke, Shoi Shi, Shuhei Nomura, et al.. (2021). Assessing the regional impact of Japan’s COVID-19 state of emergency declaration: a population-level observational study using social networking services. BMJ Open. 11(2). e042002–e042002. 5 indexed citations

14.

Kim, Kwang Su, Yoshiki Koizumi, Shinji Nakaoka, et al.. (2020). Quantifying the antiviral effect of APOBEC3 on HIV-1 infection in humanized mouse model. Journal of Theoretical Biology. 498. 110295–110295. 1 indexed citations

15.

Gonzalez-Nieto, Lucas, G. Bischof, Young C. Shin, et al.. (2019). Vaccine protection against rectal acquisition of SIVmac239 in rhesus macaques. PLoS Pathogens. 15(9). e1008015–e1008015. 6 indexed citations

16.

Ejima, Keisuke, Stephanie Dickinson, Andrew W. Brown, et al.. (2019). Exceptional reported effects and data anomalies merit explanation from “A randomized controlled trial of coordination exercise on cognitive function in obese adolescents” by Liu et al. (2018). Psychology of sport and exercise. 46. 101604–101604. 10 indexed citations

17.

Martins, Maurício A., Lucas Gonzalez-Nieto, Young C. Shin, et al.. (2018). The Frequency of Vaccine-Induced T-Cell Responses Does Not Predict the Rate of Acquisition after Repeated Intrarectal SIVmac239 Challenges in Mamu-B*08 ⁺ Rhesus Macaques. Journal of Virology. 93(5). 3 indexed citations

18.

Ejima, Keisuke. (2017). Modeling Social Contagion of Obesity. 1 indexed citations

19.

Nishiura, Hiroshi, Keisuke Ejima, Kenji Mizumoto, et al.. (2014). Cost-effective length and timing of school closure during an influenza pandemic depend on the severity. Theoretical Biology and Medical Modelling. 11(1). 5–5. 17 indexed citations

20.

Nishiura, Hiroshi, Taro Yamamoto, Kenji Mizumoto, & Keisuke Ejima. (2013). Vaccination and Clinical Severity: Is the Effectiveness of Contact Tracing and Case Isolation Hampered by Past Vaccination?. SHILAP Revista de lepidopterología. 7 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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