Megan Schreeg


Assistant Professor - Clinical

Contact 614-688-2496 Goss Laboratory
1925 Coffey Road
Columbus, OH 43210
Map Link


Veterinary Biosciences

Professional Training and experience

  • North Carolina State University College of Veterinary Medicine, Anatomic Pathology Residency, 2020
  • North Carolina State University College of Veterinary Medicine, DVM, 2017
  • North Carolina State University College of Veterinary Medicine, PhD, 2015
  • Hanover College, BA Biology, 2010

Research Interests 

  • Feline disease pathogenesis
  • Gastrointestinal, hepatobiliary, and pancreatic disease
  • Parasitic and vector-borne disease
  • Molecular diagnostics
  • Relationship between inflammation, immunology, and neoplasia development
  • Invertebrate and exotic animal pathology


  • Bauer K, Murillo DFB, Schreeg ME, Borst LB, Watanabe TTN. (2022) Pathology in Practice. Journal of the American Veterinary Medical Association. 2022 May 4;1-3. doi: 10.2460/javma.22.03.0119.
  • Schreeg ME, Radkin M, Haugland J, Murphy BG, Rushton S, Linder KE. (2021) Ameloblastic carcinoma in the horse: case report and literature review. Accepted for publication by Journal of Veterinary Diagnostic Investigation November 2021.
  • Womble MA, Schreeg ME, Hoch A, de Souza Meira EB, Foster D, Premanandan C, Watanabe TTN. (2021) Concurrent Clostridial Enteritis and Oviductal Adenocarcinoma with Carcinomatosis in an Adult Alpaca (Vicugna pacos). Accepted for publication by Journal of Comparative Pathology September 2021.
  • Schreeg ME, Miller SA, Cullen JM. (2021) Choledochal cyst with secondary cholangitis, choledochitis, duodenal papillitis, and pancreatitis in a young domestic shorthair cat.  J Vet Diagn Invest. 2021 Jul;33(4):782-787.
  • Cigarroa A, Early PJ, Mancini SL, Borst LB, Schreeg ME. (2021) Mesenchymal Tumour Arising from within a Canine Spinal Cord Hamartoma Features. Journal of Veterinary Medicine and Surgery. Vol. 5 No. 3: 38 June 15 2021.
  • Mones, A; Schreeg ME; Sommer, S; Linder, K; Lewbart, G. (2021) Surgical management and histopathology of wen overgrowth and neoplasia in four oranda goldfish (Carassius auratus). Veterinary Record Case Reports, Vol. 9 Issue 1. March 2021.
  • Melco AL, Yang TS, Schreeg ME, Savage M, Birkenheuer AJ, Petrovitch N. (2020) Pathognomonic Thoracic Radiographic Findings are Lacking in Cats with Acute Cytauxzoonosis. Vet Radiol Ultrasound 2020 Nov 27. doi: 10.1111/vru.12935.
  • Baneth G, Nachum-Biala Y, Birkenheuer AJ, Schreeg ME, Prince H, Florin-Christensen M, Schnittger L, Aroch I. (2020) Morphologic, molecular, and pathologic description of Babesia negevi sp. nov. a new piroplasmid species infecting dogs. Parasit Vectors. 2020 Apr 21;13(1):130.
  • Schreeg ME, Evans BK, Allen J, Lewis MC, Luckring E, Evola M, Richard DK, Piner K, Thompson EM, Adin DB, Tokarz DA. (2019) Cardiac leiomyosarcoma in a cat presenting for bilateral renal neoplasia. J. Comp. Path. 2019, Vol. 168, 19-24.
  • Wasserkrug Naor A, Lindemann DM, Schreeg ME, Marr HS, Birkenheuer AJ, Carpenter JW, Ryseff JK. (2019) Clinical, morphological, and molecular characterization of an Undetermined Babesia species in a maned wolf (Chrysocyon brachyurus). Ticks Tick Borne Dis. 2019 Jan;10(1):124-126
  • Mylonakis, ME*, Schreeg M*, Chatzis MK, Pearce J, Marr HS, Saridomichelakis MN, Birkenheuer AJ. (2018) Molecular detection of vector-borne pathogens in Greek cats. Ticks Tick Borne Dis. 2018 Feb; 9 (2):171-175.*Co-first authors
  • Schreeg ME, Marr HS, Tarigo JL, Sherrill MK, Outi HK, Scholl EH, Bird DM, Vigil A, Hung C, Nakajima R, Liang L, Trieu A, Doolan DL, Thomas JE, Levy MG, Reichard MV, Felgner PL, Cohn LA, Birkenheuer AJ. (2018) Identification of Cytauxzoon felis antigens via protein microarray and assessment of expression library immunization against cytauxzoonosis. Clin Proteomics. 2018 Dec 29;15:44.
  • Khana DB, Peterson DS, Stanton JB, Schreeg ME, Birkenheuer AJ, Tarigo JL. (2018) Genetic conservation of Cytauxzoon felis antigens and mRNA expression in the schizont life-stage. Vet Parasitol. 2018 Nov 15;263:49-53.
  • Qurollo BA, Archer NR, Schreeg ME, Marr HS, Birkenheuer AJ, Haney KN, Thomas BS, Breitschwerdt EB. (2017) Improved molecular detection of Canine Babesia infections using a novel quantitative real-time PCR diagnostic assay targeting mitochondrial DNA. Parasit Vectors. 10 (1): 128.
  • Schreeg ME, Marr HS, Tarigo JL, Cohn LA, Bird DM, Scholl EH, Levy MG, Wiegmann BM, Birkenheuer AJ. (2016) Mitochondrial genome sequences and structures aid in the resolution of Piroplasmida phylogeny. PLOS One. 11(11): e0165702.
  • Schreeg ME, Marr HS, Griffith EH, Tarigo JL, Bird DM, Reichard MV, Cohn LA, Levy MG, Birkenheuer AJ. (2016) PCR amplification of a multi-copy mitochondrial gene (cox3) for early detection of Cytauxzoon felis infection.  Vet Parasitology. 225:123-30
  • Schreeg ME, Marr HS, Tarigo JL, Cohn LA, Levy MG, Birkenheuer AJ.  (2015)  Rapid High-Resolution Melt Analysis of Cytauxzoon felis Cytochrome b To Aid in the Prognosis of Cytauxzoonosis. J Clin Micro. 53 (8): 2517-2524.
  • Schreeg ME, Marr HS, Tarigo JL, Cohn LA, Levy MG, Birkenheuer AJ.  (2013) Pharmacogenomics of Cytauxzoon felis cytochrome b: Implications for atovaquone and azithromycin therapy in domestic cats with cytauxzoonosis.  J Clin Micro.  51 (9): 3066-9. 
  • Lewis KM, Cohn LA, Downey ME, Whitney MS, Birkenheuer AJ.  (2012)  Evaluation of Cytauxzoon felis infection status in captive-born wild felids housed in an area endemic for the pathogen. JAVMA. 241 (8):1088-92.
  • Owens SL, Downey ME, Pressler BM, Birkenheuer AJ, Chandler DW, Scott-Moncrieff JC. (2012)  Congenital adrenal hyperplasia associated with mutation in an 11 Beta-hydroxylase-like gene in a cat.  J Vet Intern Med.  26 (5): 1221-6.
  • Di Cicco MF, Downey ME, Beeler E, Marr H, Cyrog P, Kidd L, Diniz PP, Cohn LA, Birkenheuer AJ.  (2012)  Re-emergence of Babesia conradae and effective treatment of infected dogs with atovaquone and azithromycin.  Veterinary Parasitology.  187 (1-2): 23-7.