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Jerri Bartholomew in the Aquatic Animal Health Lab

Jerri L. Bartholomew

Professor Emerita
Director, J.L. Fryer Aquatic Animal Health Laboratory
Department of Microbiology

Jerri L. Bartholomew

Professor Emerita
Director, J.L. Fryer Aquatic Animal Health Laboratory
Department of Microbiology


My lab researches the pathogens that affect the health of wild Pacific salmon populations, particularly myxozoan parasites. These parasites have complex life cycles, requiring both a fish and annelid host. Our research spans parasite biology, evolution and diversity and host immunity. However, of particular interest is how anthropogenic factors like human alteration of ecosystems and climate change affect disease in salmon.

A long-term project in the Klamath River integrates research and monitoring of one myxozoan, Ceratonova shasta, to develop recommendations for fishery management by providing real time data on parasite densities and their predicted effects on juvenile salmon.

Research Interests

  • Salmon Diseases
  • Myxozoan Parasites
  • Host Resistance Mechanisms
  • Parasite Evolution

No longer accepting students


Ph.D., Oregon State University

College strategic research areas

Marine Science


  • Müller, Maria I., Rayline T. A. Figueredo, Stephen D. Atkinson, Jerri L. Bartholomew, and Edson A. Adriano. 2023. "Henneguya correai n. sp. (Cnidaria, Myxozoa) Parasitizing the Fins of the Amazonian Fish Semaprochilodus insignis" Diversity 15, no. 6: 702.
  • Yang C., Huang Y., Atkinson S.D., Bartholomew J.L., Ma H., and Zhao Y. 2023. Morphological and genetic analysis of Ceratomyxa saurida Zhao et al. 2015 and Ceratomyxa mai n. sp. (Myxozoa: Ceratomyxidae) from the East China Sea. International Journal of Systematic and Evolutionary Microbiology.
  • Kumar G., Sudhagar A., Shivam S., Nilsen F., Bartholomew J.L., and El-Matbouli M. 2022. Identification of in vivo induced antigens of the malacosporean parasite Tetracapsuloides bryosalmonae (Cnidaria) using in vivo induced antigen technology. Frontiers in Cellular and Infection Microbiology.
  • Robinson HE, Alexander JD, Bartholomew JL, Hallett SL, Hetrick NJ, Perry RW, Som NA. 2022. Using a mechanistic framework to model the density of an aquatic parasite Ceratonova shasta. PeerJ 10:e13183
  • Bartholomew, J.L., Alexander J.D., Hallett S.L., Alama-Bermejo G., and Atkinson S.D. 2022. Ceratonova shasta: a cnidarian parasite of annelids and salmonids. Parasitology 1-14
  • Alama-Bermejo, G., Bartosova-Sojkova, P., Atkinson, S.D., Holzer, A.S., and Bartholomew, J.L. 2022. Proteases as Therapeutic Targets Against the Parasitic Cnidarian Ceratonova shasta: Characterization of Molecules Key to Parasite Virulence In Salmonid Hosts. Front. in Cell. and Infect. Microbiol. (11) DOI:10.3389/fcimb.2021.804864
  • Guo, Q., Atkinson, S.D., Xiao, B., Zhai, Y., Bartholomew, J.L., and Gu, Z. 2022. A myxozoan genome reveals mosaic evolution in a parasitic cnidarian. BMC Biol. 20(1):51.
  • Americus B., Hams N., Klompen A.M.L., Alama-Bermejo G., Lotan T., Bartholomew J.L., Atkinson S.D.. The cnidarian parasite Ceratonova shasta utilizes inherited and recruited venom-like compounds during infection. PeerJ. 2021 Dec 15;9:e12606. doi: 10.7717/peerj.12606. PMID: 35003924; PMCID: PMC8684318.
  • Brekhman, V., Ofek-Lalzar, M., Atkinson, S.D., Alama-Bermejo, G., Maor-Landaw, K., Malik, A., Bartholomew, J.L., and Lotan, T. 2021. Proteomic analysis of the parasitic Cnidarian Ceratonova shasta (Cnidaria: Myxozoa) reveals diverse roles of actin in motility and spore formation. Front. in Mar. Sci. 8:632700.
  • Kumar, G., Ertl, R., Nilsen, F., Bartholomew, J.L., and El-Matbouli, M. 2021. Data of de novo transcriptome assembly of the myxozoan parasite Tetracapsuloides bryosalmonae. Data Brief 35:106831.
  • Barrett, D.E. and Bartholomew, J.L. 2021. A tale of two fish: Comparative transcriptomics of resistant and susceptible steelhead following exposure to Ceratonova shasta highlights differences in parasite recognition. PLoS One. 16(2):e0234837.
  • Americus, B., Schisler, G.J., Bartholomew, J.L., and Atkinson, S.D. 2021. Myxobolus cerebralis Causes Presporogonic Mortality in Juvenile Mountain Whitefish. J. of Aquatic Animal Hlth. 33(2):116-122.
  • Bartošová-Sojková, P., Kyslík, J., Alama-Bermejo, G., Hartigan, A., Atkinson, S.D., Bartholomew, J.L., Picard-Sánchez, A., Palenzuela, O., Faber, M.N., Holland, J.W., and Holzer, A.S. 2021. Evolutionary Analysis of Cystatins of Early-Emerging Metazoans Reveals a Novel Subtype in Parasitic Cnidarians. Biology 10(2):110.
  • Americus, B., Bartholomew, J.L., Lotan, T., and Atkinson, S.D. 2020. A comparison of the structure and function of nematocysts in free-living and parasitic cnidarians (Myxozoa). International Journal for Parasitology, 50: 763-769. DOI:10.1016/j.ijpara.2020.04.012
  • Americus, B., Austin, B., Lotan, T., Bartholomew, J., and Atkinson, S. 2020. In vitro and in vivo assays reveal that cations affect nematocyst discharge in Myxobolus cerebralis (Cnidaria: Myxozoa). Parasitology, 147(12):1352-1358. DOI:10.1017/S0031182020001158
  • Kyger, R., Luzuriaga, A., Peri, S., Layman, T., Sandberg, T.O.M., Singh, D., Atkinson, S.D., Bartholomew, J.L., Huchon, D., Soojin, V., and Alvarez-Ponce, D. 2020. Myxosporea (Myxozoa, Cnidaria) lack DNA cytosine methylation. Molecular Biology and Evolution, msaa214. DOI:10.1093/molbev/msaa214
  • Tilic, E., Atkinson, S.D., Rouse, G. 2020. Mitochondrial genome of the freshwater annelid Manayunkia occidentalis Mitochondrial DNA Part B: Resources, 5(3): 3313-3315. DOI:10.1080/23802359.2020.1815604
  • Alama-Bermejo, G,, Meyer, E., Atkinson, S.D., Holzer, A.S., Wiśniewska, M.W., Kolísko, M., and Bartholomew, J.L. 2020. Transcriptome-wide comparisons and virulence gene polymorphisms of host-associated genotypes of the cnidarian parasite Ceratonova shasta in salmonids. Genome Biology and Evolution, 12(8), 1258-1276. DOI:10.1093/gbe/evaa109
  • Taggart-Murphy, L., Alama-Bermejo, G., Dolan, B., Takizawa, F., and Bartholomew, J. 2020. Differences in inflammatory responses of rainbow trout infected by two genotypes of the myxozoan parasite Ceratonova shasta. Dev Comp Immunol. Aug 23;114:103829. doi:10.1016/j.dci.2020.103829.
  • Kumar, G., Ertl, R., Bartholomew, J.L., and El-Matbouli, M. 2020. Transcriptome Analysis Elucidates the Key Responses of Bryozoan Fredericella sultana during the Development of Tetracapsuloides bryosalmonae (Myxozoa). Int J Mol Sci. Aug 17;21(16):5910. doi: 10.3390/ijms21165910.
  • Yahalomi, D., Atkinson, S.D., Neuhof, M., Chang. E., Philippe, H., Cartwright, P., Bartholomew, J.L., and Huchon, D. 2020. A cinidarian parasite of salmon (Myxozoa: Henneguya) lacks a mitochondrial genome. Proc Natl Acad Sci U S A. 2020 Mar 10;117(10):5358-5363. doi: 10.1073/pnas.1909907117. Epub 2020 Feb 24. PMID: 32094163
  • Richey, C.A., Kenelty, K.V., Hopkins, K.V.S., Stevens, B.N., Martinez-López, B., Hallett, S.L., Atkinson, S.D., Bartholomew, J.L., and Soto, E. 2020. Validation of environmental DNA sampling for determination of Ceratonova shasta (Cnidaria: Myxozoa) distribution in Plumas National Forest, CA. Parasitol. Res. PMID: 31897785.