Dr. Mary Anna Thrall


Dr. Mary Anna Thrall was a small animal practitioner for four years after receiving her DVM degree from Purdue University. Following her residency in clinical pathology, she was a faculty member in the Department of Pathology at Colorado State University for 32 years, and has helped train 46 veterinary pathologists. She is a diplomate of ACVP, and served that organization as president.

Dr. Thrall was the recipient of the National Zoetis AAVMC Distinguished Teaching Award in 2013 and the Adtalem Global Education TEACH Award for Teaching Excellence in 2019. She is active in continuing education to veterinarians and pathologists and has provided more than 400 scientific presentations and continuing education programs. She is author or co-author of numerous scientific publications, abstracts, proceedings, and book chapters, and is the primary author of a clinical pathology textbook, Veterinary Hematology and Clinical Chemistry. 


  1. Soto, E., Marchi, S., Beierschmitt, A., Kearney, M., Francis, S., VanNess, K., Vandenplas, M., Thrall, M.A., Palmour, R., 2016: Interaction of non-human primate complement and antibodies with hypermucoviscous Klebsiella pneumoniaeVeterinary research, 47, 40. 
  2. Bolfa, P., Larson, C., Peda, A.Hilchie, D., Christopher, M. M., & Thrall, M. A. (2018). Thoracic and paraspinal extramedullary hematopoiesis in a cat with chronic non-regenerative anemia. JFMS Open Rep, 4(2), 2055116918798868. doi:10.1177/2055116918798868 
  3. Dorrestein EHR, Peda A, Thrall MA, Illanes O: Fatal pulmonary thromboembolism, steroid hepatopathy and pulmonary mineralization in a 23 month-old dog receiving long-term corticosteroid therapy. Veterinary Record. 2019.  DOI: 10.1136/vetreccr-2018-000701 
  4. Nair R, Riddle E, Thrall MA: Hemolytic anemia, spherocytosis, and thrombocytopenia associated with honey bee envenomation in a dog.  Vet Clin Path. 2019 Jun 22. doi: 10.1111/vcp.12747.