H. J. Koornhof

4.6k total citations · 1 hit paper
93 papers, 3.2k citations indexed

About

H. J. Koornhof is a scholar working on Epidemiology, Infectious Diseases and Microbiology. According to data from OpenAlex, H. J. Koornhof has authored 93 papers receiving a total of 3.2k indexed citations (citations by other indexed papers that have themselves been cited), including 49 papers in Epidemiology, 34 papers in Infectious Diseases and 12 papers in Microbiology. Recurrent topics in H. J. Koornhof's work include Pneumonia and Respiratory Infections (27 papers), Pneumocystis jirovecii pneumonia detection and treatment (17 papers) and Tuberculosis Research and Epidemiology (15 papers). H. J. Koornhof is often cited by papers focused on Pneumonia and Respiratory Infections (27 papers), Pneumocystis jirovecii pneumonia detection and treatment (17 papers) and Tuberculosis Research and Epidemiology (15 papers). H. J. Koornhof collaborates with scholars based in South Africa, United States and United Kingdom. H. J. Koornhof's co-authors include Roy M. Robins‐Browne, Robert Austrian, Keith P. Klugman, I Freiman, Michael R. Jacobs, Raymond A. Smego, Joel I. Ward, M Isaäcson, J Kallenbach and M.A. Witcomb and has published in prestigious journals such as New England Journal of Medicine, The Lancet and The Journal of Immunology.

In The Last Decade

H. J. Koornhof

93 papers receiving 2.9k citations

Hit Papers

Emergence of Multiply Resistant Pneumococci 1978 2026 1994 2010 1978 100 200 300 400
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.

  1. Emergence of Multiply Resistant Pneumococci
    1978 493 citations H. J. Koornhof, Roy M. Robins‐Browne et al. profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
H. J. Koornhof South Africa 33 1.7k 1.2k 492 376 360 93 3.2k
Melvin I. Marks United States 37 1.8k 1.0× 1.1k 0.9× 448 0.9× 354 0.9× 552 1.5× 194 4.2k
Aldona L. Baltch United States 29 1.3k 0.8× 1.1k 0.9× 230 0.5× 216 0.6× 480 1.3× 115 2.9k
Pirkko Kotilainen Finland 35 1.8k 1.0× 1.4k 1.2× 380 0.8× 680 1.8× 546 1.5× 99 3.8k
Hoan Jong Lee South Korea 33 2.9k 1.6× 1.2k 1.0× 870 1.8× 472 1.3× 487 1.4× 190 4.0k
Victor Fainstein United States 39 1.5k 0.9× 1.6k 1.3× 190 0.4× 407 1.1× 416 1.2× 95 4.1k
P.J. van den Broek Netherlands 35 1.4k 0.8× 598 0.5× 313 0.6× 203 0.5× 560 1.6× 108 3.4k
Theodore C. Eickhoff United States 31 1.4k 0.8× 739 0.6× 340 0.7× 566 1.5× 365 1.0× 98 3.2k
Amanda Walsh United Kingdom 33 1.9k 1.1× 1.7k 1.5× 378 0.8× 558 1.5× 300 0.8× 87 4.5k
Harri Saxén Finland 35 1.6k 0.9× 1.2k 1.1× 247 0.5× 554 1.5× 197 0.5× 108 3.9k
José L. Pérez Spain 24 1.1k 0.6× 695 0.6× 343 0.7× 295 0.8× 524 1.5× 91 3.0k

Countries citing papers authored by H. J. Koornhof

Since Specialization
Citations

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

Fields of papers citing papers by H. J. Koornhof

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by H. J. Koornhof. 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 H. J. Koornhof. The network helps show where H. J. Koornhof may publish in the future.

Co-authorship network of co-authors of H. J. Koornhof

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

All Works

20 of 20 papers shown
1.
Kuonza, Lazarus, et al.. (2018). Feasibility of using postal and web-based surveys to estimate the prevalence of tuberculosis among health care workers in South Africa. PLoS ONE. 13(5). e0197022–e0197022. 8 indexed citations
2.
Koornhof, H. J., et al.. (2017). Relapse, re-infection and mixed infections in tuberculosis disease. Pathogens and Disease. 75(3). 77 indexed citations
3.
Nyasulu, Peter S., Jill Murray, Olga Perovic, & H. J. Koornhof. (2017). Laboratory information system for reporting antimicrobial resistant isolates from academic hospitals, South Africa. The Journal of Infection in Developing Countries. 11(9). 705–718. 6 indexed citations
4.
Scott, Lesley, Natasha Gous, Bavesh D Kana, et al.. (2011). Dried Culture Spots for Xpert MTB/RIF External Quality Assessment: Results of a Phase 1 Pilot Study in South Africa. Journal of Clinical Microbiology. 49(12). 4356–4360. 25 indexed citations
5.
Koornhof, H. J., Karen H. Keddy, & Lesley McGee. (2006). Clonal Expansion of Bacterial Pathogens across the World. Journal of Travel Medicine. 8(1). 29–40. 4 indexed citations
6.
McCarthy, Kerrigan, et al.. (1998). Rothia dentocariosa endocarditis and aortic root abscess. Journal of Infection. 37(3). 292–295. 21 indexed citations
7.
Morris, Lynn, Eli Silber, Pam Sonnenberg, et al.. (1998). High Human Immunodeficiency Virus Type 1 RNA Load in the Cerebrospinal Fluid from Patients with Lymphocytic Meningitis. The Journal of Infectious Diseases. 177(2). 473–476. 45 indexed citations
8.
Marcus, Leonard C., et al.. (1996). First reported African case ofAnaerobiospirillum succiniciproducens septicemia. European Journal of Clinical Microbiology & Infectious Diseases. 15(9). 741–744. 11 indexed citations
9.
Widgerow, Alan D., Adrian Brink, & H. J. Koornhof. (1995). Atypical Mycobacterium and Breast Surgery. Annals of Plastic Surgery. 35(2). 204–207. 14 indexed citations
10.
Adrian, Peter V., et al.. (1993). Trimethoprim resistance in south african isolates of aerobic gram-negative faecal flora. European Journal of Clinical Microbiology & Infectious Diseases. 12(12). 916–921. 5 indexed citations
11.
Koornhof, H. J., et al.. (1992). In vitro antimicrobial susceptibility of viridans streptococci isolated from blood cultures. European Journal of Clinical Microbiology & Infectious Diseases. 11(6). 543–546. 52 indexed citations
12.
Windsor, Helen M., et al.. (1991). Plasmid-mediated NAD independence in Haemophilus parainfluenzae. Journal of General Microbiology. 137(10). 2415–2421. 14 indexed citations
13.
Feldman, Charles, et al.. (1990). Klebsiella pneumoniae bacteraemia at an urban general hospital. Journal of Infection. 20(1). 21–31. 37 indexed citations
14.
Chalkley, L. J. & H. J. Koornhof. (1990). Intra- and inter-specific transformation of Streptococcus pneumoniae to penicillin resistance. Journal of Antimicrobial Chemotherapy. 26(1). 21–28. 31 indexed citations
15.
Koornhof, H. J., et al.. (1984). Clostridium difficile colitis associated with the use of antineoplastic agents. European Journal of Clinical Microbiology & Infectious Diseases. 3(1). 10–13. 33 indexed citations
16.
Ballard, Ronald C., et al.. (1982). Antimicrobial susceptibility of 103 strains of Haemophilus ducreyi isolated in Johannesburg. Antimicrobial Agents and Chemotherapy. 22(4). 686–688. 25 indexed citations
17.
Robins‐Browne, Roy M., et al.. (1977). Pathogenic mechanisms of a non-agglutinable Vibrio cholerae strain: demonstration of invasive and enterotoxigenic properties. Infection and Immunity. 18(2). 542–545. 27 indexed citations
18.
Anderson, Ronald, et al.. (1976). Defective neutrophil motility in children with measles. The Journal of Pediatrics. 89(1). 27–32. 45 indexed citations
19.
McLaren, M., Devan Hawkins, H. J. Koornhof, et al.. (1975). Epidemiology of rheumatic heart disease in black shcoolchildren of Soweto, Johannesburg.. BMJ. 3(5981). 474–478. 88 indexed citations
20.
Koornhof, H. J., et al.. (1975). VIRUSES IN ACUTE SUMMER GASTROENTERITIS IN BLACK INFANTS. The Lancet. 305(7915). 1093–1094. 45 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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