John M. Hardham

3.2k total citations · 1 hit paper
35 papers, 1.6k citations indexed

About

John M. Hardham is a scholar working on Infectious Diseases, Physiology and Genetics. According to data from OpenAlex, John M. Hardham has authored 35 papers receiving a total of 1.6k indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Infectious Diseases, 12 papers in Physiology and 9 papers in Genetics. Recurrent topics in John M. Hardham's work include Syphilis Diagnosis and Treatment (11 papers), Vector-Borne Animal Diseases (7 papers) and Vector-borne infectious diseases (6 papers). John M. Hardham is often cited by papers focused on Syphilis Diagnosis and Treatment (11 papers), Vector-Borne Animal Diseases (7 papers) and Vector-borne infectious diseases (6 papers). John M. Hardham collaborates with scholars based in United States, United Kingdom and Ireland. John M. Hardham's co-authors include Steven J. Norris, Alan G. Barbour, Jing-Ren Zhang, Matthew B. Lawrenz, Lola V. Stamm, R. T. Evans, Cornelia Sfintescu, Jason W.H. Wong, Reza Khayat and John E. Johnson and has published in prestigious journals such as Cell, Proceedings of the National Academy of Sciences and Journal of Biological Chemistry.

In The Last Decade

John M. Hardham

34 papers receiving 1.6k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Antigenic Variation in Lyme Disease Borreliae by Promiscuous Recombination of VMP-like Sequence Cassettes

1997 525 citations Jing-Ren Zhang, John M. Hardham et al. Cell profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
John M. Hardham United States	19	740	716	262	257	238	35	1.6k
Daniel Hogan United States	17	555 0.8×	629 0.9×	289 1.1×	173 0.7×	260 1.1×	19	1.8k
Alessandro Mannelli Italy	26	931 1.3×	1.2k 1.6×	61 0.2×	160 0.6×	436 1.8×	82	1.9k
Andrea Pires dos Santos United States	23	720 1.0×	979 1.4×	135 0.5×	81 0.3×	190 0.8×	138	1.6k
Junya Yamagishi Japan	26	516 0.7×	916 1.3×	582 2.2×	117 0.5×	244 1.0×	135	2.0k
Hermann Willems Germany	22	448 0.6×	455 0.6×	177 0.7×	421 1.6×	165 0.7×	81	1.4k
E. F. Kaleta Germany	22	716 1.0×	355 0.5×	140 0.5×	227 0.9×	196 0.8×	160	2.2k
C. L. Larson United States	24	525 0.7×	597 0.8×	465 1.8×	186 0.7×	53 0.2×	56	1.8k
Junzo Norimine Japan	27	665 0.9×	791 1.1×	262 1.0×	287 1.1×	555 2.3×	87	2.0k
George L. Murphy United States	22	594 0.8×	742 1.0×	232 0.9×	141 0.5×	329 1.4×	44	1.5k
Ryô Harasawa Japan	27	888 1.2×	564 0.8×	250 1.0×	334 1.3×	432 1.8×	139	2.3k

Countries citing papers authored by John M. Hardham

Since Specialization

Citations

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

Fields of papers citing papers by John M. Hardham

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John M. Hardham. 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 John M. Hardham. The network helps show where John M. Hardham may publish in the future.

Co-authorship network of co-authors of John M. Hardham

This figure shows the co-authorship network connecting the top 25 collaborators of John M. Hardham. A scholar is included among the top collaborators of John M. Hardham 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 John M. Hardham. John M. Hardham 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

Ramasamy, Santhamani, Stephen D. Cole, Julie Armstrong, et al.. (2025). Spillover of SARS-CoV-2 to domestic dogs in COVID-19–positive households: A one health surveillance study. Virus Research. 360. 199629–199629.

Ramasamy, Santhamani, Abhinay Gontu, Sabari Nath Neerukonda, et al.. (2023). SARS-CoV-2 Prevalence and Variant Surveillance among Cats in Pittsburgh, Pennsylvania, USA. Viruses. 15(7). 1493–1493. 6 indexed citations

Diel, Diego G., et al.. (2023). Subcutaneous and intramuscular administration of a SARS-CoV-2 vaccine are similarly effective in generating a humoral response in domestic goats (Capra hircus). American Journal of Veterinary Research. 84(10). 1–6. 1 indexed citations

Webster, Mark, Keith Ameiss, Paul J. Dominowski, et al.. (2022). Experimental veterinary SARS-CoV-2 vaccine cross neutralization of the Delta (B.1.617.2) variant virus in cats. Veterinary Microbiology. 268. 109395–109395. 6 indexed citations

Hardham, John M., Peter W. Krug, Juan M. Pacheco, et al.. (2020). Novel Foot-and-Mouth Disease Vaccine Platform: Formulations for Safe and DIVA-Compatible FMD Vaccines With Improved Potency. Frontiers in Veterinary Science. 7. 554305–554305. 20 indexed citations

Geurden, Thomas, et al.. (2018). Antibody recognition of cathepsin L1-derived peptides in Fasciola hepatica-infected and/or vaccinated cattle and identification of protective linear B-cell epitopes. Vaccine. 36(7). 958–968. 25 indexed citations

Chen, Qi, Joseph T. Thomas, Luis G. Giménez‐Lirola, et al.. (2016). Evaluation of serological cross-reactivity and cross-neutralization between the United States porcine epidemic diarrhea virus prototype and S-INDEL-variant strains. BMC Veterinary Research. 12(1). 70–70. 34 indexed citations

Wagner, Bettina, John L. Johnson, David Garcia-Tapia, et al.. (2015). Comparison of effectiveness of cefovecin, doxycycline, and amoxicillin for the treatment of experimentally induced early Lyme borreliosis in dogs. BMC Veterinary Research. 11(1). 163–163. 15 indexed citations

Khayat, Reza, Nicholas D. Brunn, Jeffrey A. Speir, et al.. (2011). The 2.3-Angstrom Structure of Porcine Circovirus 2. Journal of Virology. 85(15). 7856–7862. 163 indexed citations

10.

Stamm, Lola V., et al.. (2006). Identification and characterization of a Treponema pallidum subsp. pallidum gene encoding a DNA adenine methyltransferase. FEMS Microbiology Letters. 155(1). 115–119. 1 indexed citations

11.

Hardham, John M., et al.. (2005). Evaluation of a monovalent companion animal periodontal disease vaccine in an experimental mouse periodontitis model. Vaccine. 23(24). 3148–3156. 26 indexed citations

12.

Eicken, Christoph, Vivek Sharma, Thomas Klabunde, et al.. (2002). Crystal Structure of Lyme Disease Variable Surface Antigen VlsE of Borrelia burgdorferi. Journal of Biological Chemistry. 277(24). 21691–21696. 112 indexed citations

13.

Weinstock, George M., David Šmajs, John M. Hardham, & Steven J. Norris. (2000). From microbial genome sequence to applications. Research in Microbiology. 151(2). 151–158. 31 indexed citations

14.

Zhang, Jing-Ren, John M. Hardham, Alan G. Barbour, & Steven J. Norris. (1999). Antigenic Variation in Lyme Disease Borreliae by Promiscuous Recombination of VMP-like Sequence Cassettes. Cell. 96(3). 447–447. 3 indexed citations

15.

Greene, Shermalyn R., et al.. (1998). Identification and sequence analysis ofTreponema pallidum tprJ, a member of a polymorphic multigene family. FEMS Microbiology Letters. 169(1). 155–163. 31 indexed citations

16.

Hardham, John M., Jonathan G. Frye, Natalie Young, & Lola V. Stamm. (1997). Short Communication: Identification and Sequences of theTreponema pallidum flhA, flhF, andorf 304Genes. DNA sequence. 7(2). 107–116. 4 indexed citations

17.

Hardham, John M., Lola V. Stamm, Stephen F. Porcella, et al.. (1997). Identification and transcriptional analysis of a Treponema pallidum operon encoding a putative ABC transport system, an iron-activated repressor protein homolog, and a glycolytic pathway enzyme homolog. Gene. 197(1-2). 47–64. 63 indexed citations

18.

Zhang, Jing-Ren, John M. Hardham, Alan G. Barbour, & Steven J. Norris. (1997). Antigenic Variation in Lyme Disease Borreliae by Promiscuous Recombination of VMP-like Sequence Cassettes. Cell. 89(2). 275–285. 525 indexed citations breakdown →

19.

Young, Natalie, et al.. (1996). Identification and sequences of theTreponema pallidum mglAandmglCgenes. DNA sequence. 6(5). 293–298. 7 indexed citations

20.

Hardham, John M., Jonathan G. Frye, & Lola V. Stamm. (1995). Identification and sequences of the Treponema pallidum fliM', fli Y, fliP, fliQ, fliR and flhB' genes. Gene. 166(1). 57–64. 20 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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