Biomedical Science Department

EDUCATION/TRAINING

• Post doctoral:
    - U.S. Centers for Disease Control and Prevention, Division of Parasitic Diseases
    - Center for Tropical Disease Research and Training, Department of Biological Sciences, University of Notre Dame
• Ph.D. Microbiology, Colorado State University
• M.A. Geography, University of Florida
• B.A. Biology, Denison University

RESEARCH INTERESTS

• Using genetic markers to study the transmission dynamics of protozoan parasites
• Employing population genomics techniques to detect the evolution of drug resistance in parasitic nematodes of medical and veterinary importance

PUBLICATIONS

Lehmann T., Graham D.H., Dahl E., Bahia-Oliveira L.M., da Silva, D.S., and Dubey, J.P. Variation in the structure of Toxoplasma gondii and the roles of selfing, drift and epistatic selection in maintaining linkage disequilibria, Infection, Genetics, and Evolution, in press.

Dubey, J.P., Graham, D.H., De Young, R.W., Dahl, E., Eberhard, M.L., Nace, E.K., Won, K., Bishop, H., Punkosdy, G., Sreekumar, C., Vianna, M.C., Shen, S.K., Kwok, O.C.H., Machin, M., Sumners, J.A., Demarais, S., Humphreys, J.G., and Lehmann, T.  Characterization of recent isolates of Toxoplasma gondii from wildlife in the United States. Journal of Parasitology, in press

Dubey J.P, Navarro I.T., Graham D.H., Dahl E., Freire R.L., Prudencio L.B., Sreekumar C., Vianna M.C., Lehmann T.  Characterization of Toxoplasma gondii isolates from free range chickens from Paraná, Brazil,  Veterinary Parasitology. 2003 Nov 14, 117(3):229-34. [abstract] 

Graham, D.H., Holmes, J.L., and Black, W.C. IV.  Quantitative trait loci conditioning transovarial transmission of La Crosse Virus in the eastern treehole mosquito, Ochlerotatus triseriatus.  Insect Molecular Biology 2003, 12(4), 307-318. [abstract]

Dubey J.P., Venturini M.C., Venturini L., Piscopo M., Graham D.H., Dahl E., Sreekumar C., Vianna M.C., Lehmann T.  Isolation and genotyping of Toxoplasma gondii from free-ranging chickens from Argentina.  Journal of Parasitology 2003 Oct; 89(5):1063-4. [abstract] 

Dubey J.P., Graham D.H., Dahl E., Sreekumar C., Lehmann T., Davis M.F., Morishita T.Y. Toxoplasma gondii isolates from free-ranging chickens from the United States, Journal of Parasitology 2003 Oct; 89(5):1060-2. [abstract] 

Dubey J.P., Graham D.H., da Silva D.S., Lehmann T., Bahia-Oliveira L.M. Toxoplasma gondii isolates of free-ranging chickens from Rio de Janeiro, Brazil: mouse mortality, genotype, and oocyst shedding by cats.  Journal of Parasitology 2003 Aug; 89(4):851-3. [abstract]

Lehmann, T., Graham, D.H., Dahl, E., Sreekumar, C., Launer, F., Gamble, R. and Dubey, J.P.  Transmission dynamics of Toxoplasma gondii on a pig farm  Infection, Genetics, and Evolution  2003 Jul. 3(2):135-41. [abstract]

Dubey, J.P., Graham, D.H., Dahl, E., Hilali, M., El-Ghaysh, A., Sreekumar, C., Kwok, O.C.H, Shen, S.K., Lehmann, T.  Isolation and molecular characterization of Toxoplasma gondii isolates from chickens and ducks from Egypt.Veterinary Parasitology 2003 May 30;114(2):89-95. [abstract]

Dubey, J.P.,  Graham, D.H., Blackston, C.B., Lehmann, T., Gennari, S.M., Ragoso, A.M.A., Nishi, S.M., Shen, S.K., Kwok, O.C.H., Hill, D.E., and Thulliez, P., Biological and genetic characterization of Toxoplasma gondii isolates from chickens (Gallus domesticus) from São Paulo, Brazil: unexpected findings.  International Journal for Parasitology, 2002, 32(1): 99-105. [abstract]

Graham, D.H. J.L. Holmes, S. Higgs, B.J. Beaty, and W.C. Black IV. (1999) Selection of  Refractory and Permissive strains of Aedes triseriatus (Diptera: Culicidae) for transovarial transmission of La Crosse virus. Journal of Medical Entomology 36(6): 671-678. [abstract]

Graham, D.H.  (1992) From the kiss of a cobra: a sidelong view of snakebite, antivenin, and serum sickness.  The American Biology Teacher.  September 1992, 54(6): 333-337 [full text]

Graham, D.H.  (1986) Land use in the Amazon: soil erosion, sedimentation, and the Samuel dam. The Latin Americanist.  22(1): 1-5.