John A. Hnida, Ph.D.

Associate Professor of Microbiology

Midwestern University
Arizona College of Osteopathic Medicine
Department of Microbiology/Immunology
Agave Hall, Room #203E
19555 N. 59th Avenue
Glendale, AZ 85308

Office: (623) 572-3258


B.S. Zoology Arizona State University 1974
M.S. Zoology University of Wisconsin-Milwaukee 1985
Ph.D. Biology University of New Mexico 1998


I work on the taxonomy of the coccidian parasites of vertebrates. The coccidia are a group of parasitic protozoa important to both veterinary and human medicine. Most of my work focuses on the coccidia of wild rodents and reptiles. 

Research Projects


Survey of the coccidia of  round-tailed ground squirrels

Survey of the coccidia of Arizona cotton rats

Survey of the coccidia of Harris's antelope squirrel 

Selected Publications

Hnida, J. A. (2015) A new species of Isospora Schneider, 1881 (Apicomplexa: Eimeriidae) from Morafka's desert tortoise Gopherus morafkai (Testudines: Testudinidae). Systematic Parasitology 92:219-222.  

Hnida, J. A. (2016) New Host and Distribution Records of Eimeria callospermophili. Comparative Parasitology 83:122-123.

Hnida, J. A., and A. Flocken (2016) Eimeria vilasi (Apicomplexa: Eimeriidae) from the round-tailed ground squirrel (Xerospermophilus tereticaudus). Southwestern Naturalist 61:331-333.

McAllister, C.T., and J. A. Hnida (2016) Eimeria chelydrae Ernst, Stewart, Sampson, and Fincher, 1969 (Apicomplexa: Eimeriidae) from the Common Snapping Turtle, Chelydra serpentina (Reptilia: Testudines: Chelydridae): First Report from Oklahoma. Proceedings of the Oklahoma Academy of Science 96:73-75.

Hnida, J.A. (2018) Eimeria maricopensis n. sp. (Apicomplexa: Eimeriidae)from the Arizona cotton rat Sigmodon arizonae Mearns(Rodentia: Cricetidae) in central Arizona, USA. Systematic Parasitology 95:301-307.