John S. Spika

4.9k total citations
69 papers, 3.5k citations indexed

About

John S. Spika is a scholar working on Epidemiology, Endocrinology and Infectious Diseases. According to data from OpenAlex, John S. Spika has authored 69 papers receiving a total of 3.5k indexed citations (citations by other indexed papers that have themselves been cited), including 31 papers in Epidemiology, 19 papers in Endocrinology and 17 papers in Infectious Diseases. Recurrent topics in John S. Spika's work include Pneumonia and Respiratory Infections (18 papers), Escherichia coli research studies (12 papers) and Vaccine Coverage and Hesitancy (8 papers). John S. Spika is often cited by papers focused on Pneumonia and Respiratory Infections (18 papers), Escherichia coli research studies (12 papers) and Vaccine Coverage and Hesitancy (8 papers). John S. Spika collaborates with scholars based in United States, Canada and Denmark. John S. Spika's co-authors include Richard R. Facklam, Brian D. Plikaytis, Margaret J. Oxtoby, Shane A. Renwick, Roger P. Johnson, Robert Clarke, Timothy D. Mastro, H. Lior, Paul A. Blake and Kris Rahn and has published in prestigious journals such as New England Journal of Medicine, PEDIATRICS and Clinical Infectious Diseases.

In The Last Decade

John S. Spika

68 papers receiving 3.3k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
John S. Spika United States 33 1.5k 1.1k 1.1k 582 508 69 3.5k
C. A. Hart United Kingdom 37 1.1k 0.7× 1.5k 1.3× 922 0.9× 1.3k 2.2× 419 0.8× 132 4.7k
B. Kaijser Sweden 40 1.3k 0.9× 1.3k 1.2× 1.5k 1.4× 1.3k 2.3× 452 0.9× 164 4.6k
N.J. Legakis Greece 40 1.5k 1.0× 973 0.9× 1.1k 1.0× 679 1.2× 234 0.5× 187 5.1k
Sabine Lauwers Belgium 30 536 0.3× 980 0.9× 1.5k 1.4× 764 1.3× 324 0.6× 89 3.3k
Marie Louie Canada 34 769 0.5× 1.7k 1.5× 940 0.9× 627 1.1× 208 0.4× 107 3.8k
Pirkko Kotilainen Finland 35 1.8k 1.1× 1.4k 1.2× 305 0.3× 651 1.1× 380 0.7× 99 3.8k
Colin Block Israel 34 1.2k 0.8× 1.5k 1.4× 1.0k 1.0× 231 0.4× 545 1.1× 113 3.6k
Pere Coll Spain 39 2.5k 1.7× 1.4k 1.3× 569 0.5× 277 0.5× 393 0.8× 156 4.5k
Petri Ruutu Finland 43 2.6k 1.7× 2.1k 1.9× 298 0.3× 840 1.4× 423 0.8× 163 5.3k
Robert W. Frenck United States 40 1.1k 0.7× 1.9k 1.7× 674 0.6× 452 0.8× 247 0.5× 116 4.7k

Countries citing papers authored by John S. Spika

Since Specialization
Citations

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

Fields of papers citing papers by John S. Spika

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of John S. Spika

This figure shows the co-authorship network connecting the top 25 collaborators of John S. Spika. A scholar is included among the top collaborators of John S. Spika 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 S. Spika. John S. Spika 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.
Spika, John S., et al.. (2015). Immunization as a tool to combat antimicrobial resistance. Canada Communicable Disease Report. 41(S5). 7–10. 3 indexed citations
2.
Campbell, Andrew, Rachel Rodin, R. Kropp, et al.. (2010). Risk of severe outcomes among patients admitted to hospital with pandemic (H1N1) influenza. Canadian Medical Association Journal. 182(4). 349–355. 147 indexed citations
3.
Desai, Saaketh, L Pelletier, Michelle D. Garner, & John S. Spika. (2008). Increase in poliomyelitis cases in Nigeria. Canadian Medical Association Journal. 179(9). 930–930. 4 indexed citations
4.
Veličko, Inga, et al.. (2008). Nationwide measles epidemic in Ukraine: The effect of low vaccine effectiveness. Vaccine. 26(52). 6980–6985. 28 indexed citations
5.
Halperin, Scott A., et al.. (2001). Pertussis Is a Frequent Cause of Prolonged Cough Illness in Adults and Adolescents. Clinical Infectious Diseases. 32(12). 1691–1697. 183 indexed citations
6.
Holton, Donna, Jeff Wilson, Andrea Ellis, et al.. (1998). A Canadian Multicentre Case‐Control Study of Sporadic Escherichia coli 0157:H7 Infection. Canadian Journal of Infectious Diseases and Medical Microbiology. 10(2). 117–121. 2 indexed citations
7.
Kertesz, Daniel A., José Luis Di Fábio, Maria Cristina de Cunto Brandileone, et al.. (1998). Invasive Streptococcus pneumoniae Infection in Latin American Children: Results of the Pan American Health Organization Surveillance Study. Clinical Infectious Diseases. 26(6). 1355–1361. 87 indexed citations
8.
Wilson, Jeffrey B., Roger P. Johnson, Robert Clarke, et al.. (1997). Canadian Perspectives on Verocytotoxin-Producing Escherichia coli Infection. Journal of Food Protection. 60(11). 1451–1453. 16 indexed citations
9.
Wilson, Jeff, Robert Clarke, Shane A. Renwick, et al.. (1996). Vero Cytotoxigenic Escherichia coli Infection in Dairy Farm Families. The Journal of Infectious Diseases. 174(5). 1021–1027. 104 indexed citations
10.
Johnson, Roger P., Robert Clarke, Susan Read, et al.. (1996). Growing Concerns and Recent Outbreaks Involving Non-O157:H7 Serotypes of Verotoxigenic Escherichia coli. Journal of Food Protection. 59(10). 1112–1122. 207 indexed citations
11.
Holton, Donna, Carolyn Pim, Sharon Macdonald, et al.. (1994). An Outbreak of Diarrhea due to Verotoxin-producing Escherichia coli in the Canadian Northwest Territories. Scandinavian Journal of Infectious Diseases. 26(6). 675–684. 50 indexed citations
12.
Campbell, James F., Robert C. Barnes, Phyllis E. Kozarsky, & John S. Spika. (1991). Culture-Confirmed Pneumonia Due to Chlamydia pneumoniae. The Journal of Infectious Diseases. 164(2). 411–413. 22 indexed citations
13.
Spika, John S., et al.. (1991). Antimicrobial Resistance of Streptococcus pneumoniae in the United States, 1979-1987. The Journal of Infectious Diseases. 163(6). 1273–1278. 236 indexed citations
14.
Spika, John S., David S. Fedson, & Richard R. Facklam. (1990). Pneumococcal Vaccination. Infectious Disease Clinics of North America. 4(1). 11–27. 31 indexed citations
15.
Mastro, Timothy D., et al.. (1990). Vancomycin-Resistant Pediococcus acidilactici: Nine Cases of Bacteremia. The Journal of Infectious Diseases. 161(5). 956–960. 36 indexed citations
16.
Redd, Stephen C., George W. Rutherford, Merle A. Sande, et al.. (1990). The Role of Human Immunodeficiency Virus Infection in Pneumococcal Bacteremia in San Francisco Residents. The Journal of Infectious Diseases. 162(5). 1012–1017. 213 indexed citations
17.
Spika, John S., et al.. (1989). Prevalence of Salmonella and multiple antimicrobial-resistant Salmonella in California dairies. Journal of the American Veterinary Medical Association. 195(1). 59–63. 35 indexed citations
18.
Spika, John S., et al.. (1989). Acute lower respiratory infections: a major cause of death in children in Bangladesh. Annals of Tropical Paediatrics. 9(1). 33–39. 37 indexed citations
19.
Spika, John S., John E. Parsons, Dale Nordenberg, et al.. (1986). Hemolytic uremic syndrome and diarrhea associated with Escherichia coli 0157:H7 in a day care center. The Journal of Pediatrics. 109(2). 287–291. 169 indexed citations
20.
Spika, John S., Neal A. Halsey, Chap T. Le, et al.. (1986). Decline of Vaccine-Induced Antipneumococcal Antibody in Children With Nephrotic Syndrome. American Journal of Kidney Diseases. 7(6). 466–470. 25 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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