C. A. Speer

7.2k citations

100 papers · 4.9k indexed · 3 hit papers · h-index 30

Impact in

Parasitology top 0.05%
- Toxoplasma gondii Research Studies
- Parasitic Infections and Diagnostics
Virology top 1%
- Rabies epidemiology and control

Papers in

Parasitology 84
- Toxoplasma gondii Research Studies 58
- Parasitic Infections and Diagnostics 47
Animal Science and Zoology 30
- Coccidia and coccidiosis research 30

Co-authors: J. P. Dubey David S. Lindsay Ronald Fayer Michael J. Topper A. Uggla James L. Carpenter John A. Blixt Benjamin M. Rosenthal
Journals: Journal of Parasitology (28 papers)Infection and Immunity (8 papers)Canadian Journal of Zoology (6 papers)Veterinary Parasitology (6 papers)Journal of Wildlife Diseases (4 papers)
Partner nations: United States Canada Japan

In The Last Decade

C. A. Speer

98 papers receiving 4.7k citations

Hit Papers

align trajectories log scale

Sarcocystosis of Animals and Humans 2015 · 354 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2015 Sarcocystosis of Animals and Humans
1998 Clinical Microbiology Reviews
1988 Journal of the American Veterinary Medical Association

Peers

Countries citing papers authored by C. A. Speer

Since Specialization

Citations

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

Fields of papers citing papers by C. A. Speer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by C. A. Speer. 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 C. A. Speer. The network helps show where C. A. Speer may publish in the future.

Co-authorship network

The 25 scholars most cited alongside C. A. Speer, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with C. A. Speer Line = papers co-authored together C. A. Speer links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	Optimization of Serum EVELISA for Milk Testing of Johne's Disease Foodborne Pathogens and Disease ·Ashutosh Wadhwa, John P. Bannantine, Todd M. Byrem, M Lapiere, Arnold M. Saxton, C. A. Speer, Shigetoshi Eda	2012	14
2	New Method of Serological Testing for Mycobacterium avium subsp. paratuberculosis (Johne's Disease) by Flow Cytometry Foodborne Pathogens and Disease ·Shigetoshi Eda, Kh.V. Zub, Mary C. Scott, W. Ray Waters, John P. Bannantine, R. H. Whitlock, C. A. Speer	2005	25
3	Ultrastructural differentiation of Toxoplasma gondii schizonts (types B to E) and gamonts in the intestines of cats fed bradyzoites International Journal for Parasitology ·C. A. Speer, J. P. Dubey	2004	39
4	CHARACTERIZATION OF THE OREGON ISOLATE OFNEOSPORA HUGHESIFROM A HORSE Journal of Parasitology ·J. P. Dubey, S. Liddell, David L. Mattson, C. A. Speer, Daniel K. Howe, Mark C. Jenkins	2001	49
5	Sarcocystis lindsayi n. sp. (Protozoa: Sarcocystidae) from the South American Opossum, Didelphis albiventris from Brazil Journal of Eukaryotic Microbiology ·J. P. Dubey, Benjamin M. Rosenthal, C. A. Speer	2001	44
6	Characteristics of a recent isolate of Sarcocystis neurona (SN7) from a horse and loss of pathogenicity of isolates SN6 and SN7 by passages in cell culture Veterinary Parasitology ·J. P. Dubey, D. E. Mattson, C. A. Speer, Amir N. Hamir, David S. Lindsay, Benjamin M. Rosenthal, O. C. H. Kwok, Rocky J. Baker, Donna M. Mulrooney, Susan J. Tornquist, Leigh de Chaves	2001	12
7	Isolation ofSarcocystisspeeriDubey and Lindsay, 1999 Parasite from the South American Opossum (Didelphis albiventris) from Argentina Journal of Parasitology ·J. P. Dubey, L. Venturini, M.C. Venturini, C. A. Speer	2000	17
8	Absence of the tight junctional protein AF-6 disrupts epithelial cell–cell junctions and cell polarity during mouse development Current Biology ·Alexander B. Zhadanov, David William Provance, C. A. Speer, J. Douglas Coffin, Ariane Kuhne, John A. Blixt, Cheryl M. Reichert, John A. Mercer	1999	157
9	Characterization of aSarcocystis neurona.Isolate (SN6) from a Naturally Infected Horse from Oregon Journal of Eukaryotic Microbiology ·J. P. Dubey, D. E. Mattson, C. A. Speer, Rocky J. Baker, Donna M. Mulrooney, Susan J. Tornquist, Amir N. Hamir, Leigh de Chaves	1999	60
10	Effect of monensin, laidomycin, and lasalocid on coccidiosis control weight gain and feed intake in young calves Journal of Dairy Science ·Rosario REina Gomez, J C Parrott, C. A. Speer, Kelly Lechtenberg	1998	4
11	Effect of gamma irradiation on unsporulated and sporulated Toxoplasma gondii oocysts International Journal for Parasitology ·J. P. Dubey, Donald W. Thayer, C. A. Speer, S. K. Shen	1998	47
12	Eimeria bovis: Expression of a Related Group of Refractile Body-Associated Proteins during Schizogony Experimental Parasitology ·Mitchell S. Abrahamsen, Fang Lin, Mark A. Jutila, C. A. Speer, Michael W. White	1994	6
13	Use of infected cultured cells to compare ultrastructural features of Neospora caninum from dogs and Toxoplasma gondii American Journal of Veterinary Research ·David S. Lindsay, C. A. Speer, Maria Toivio‐Kinnucan, J. P. Dubey, Byron L. Blagburn	1993	45
14	Developmental gene expression in Eimeria bovis Molecular and Biochemical Parasitology ·Mitchell S. Abrahamsen, Timothy G. Clark, A. Mader, C. A. Speer, Michael W. White	1993	21
15	Ultrastructure of Tachyzoites, Bradyzoites and Tissue Cysts of Neospora caninum The Journal of Protozoology ·C. A. Speer, J. P. Dubey	1989	50
16	Ultrastructure of Two Types of First‐Generation Merozoites of Eimeria bovis¹ The Journal of Protozoology ·C. A. Speer	1988	4
17	Development of Hammondia heydorni in Cultured Bovine and Ovine Cells¹ The Journal of Protozoology ·C. A. Speer, J. P. Dubey, John A. Blixt, Byron L. Blagburn	1988	16
18	In vitro cultivation of Sarcocystis merozoites Parasitology Today ·C. A. Speer, Donald E. Burgess	1987	3
19	Development of Sarcocystis hemionilatrantis Hudkins and Kistner, 1977 in the small intestine of coyotes. Proceedings of the Helminthological Society of Washington ·C. A. Speer, T. Nagamune, John V. Ernst	1980	5
20	Prevalence of Toxoplasma antibodies in humans and various animals in the Amazon. Proceedings of the Helminthological Society of Washington ·Michael Swartzendruber, S G Reed, C. A. Speer	1980	16

About C. A. Speer

C. A. Speer is a scholar working on Parasitology, Animal Science and Zoology, Small Animals, Virology and Epidemiology, having authored 100 papers that have together received 4.9k indexed citations. Recurring topics across this work include Toxoplasma gondii Research Studies (58 papers), Parasitic Infections and Diagnostics (47 papers), Coccidia and coccidiosis research (30 papers), Mycobacterium research and diagnosis (8 papers), Herpesvirus Infections and Treatments (7 papers), Veterinary medicine and infectious diseases (6 papers), Cytomegalovirus and herpesvirus research (6 papers) and Helminth infection and control (6 papers). The work is most often cited by research in Parasitology (4.2k citations), Virology (585 citations), Animal Science and Zoology (805 citations), Small Animals (362 citations) and Epidemiology (1.6k citations). C. A. Speer has collaborated with scholars based in United States, Canada and Japan. Frequent co-authors include J. P. Dubey, David S. Lindsay, Ronald Fayer, Michael J. Topper, A. Uggla, James L. Carpenter, John A. Blixt, J. P. Dubey, Benjamin M. Rosenthal and James A. Harp. Their work appears in journals such as Journal of Parasitology, Infection and Immunity, Canadian Journal of Zoology, Veterinary Parasitology and Journal of Wildlife Diseases.

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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