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United States Department of Agriculture

Agricultural Research Service

Related Topics

OLIVER C KWOK
Animal Parasitic Diseases
Microbiologist

Phone: (301) 504-8984
Fax: (301) 504-9222
Room 103
10300 BALTIMORE AVENUE
BLDG 1040 BARC-EAST
BELTSVILLE, MD, 20705-2350


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Isolation and genetic characterization of Toxoplasma gondii from alpaca (Vicugna pacos) and sheep (Ovis aries) grazed on pasture in Virginia - (Peer Reviewed Journal) - (25-Jun-14)
Detection and survival of Toxoplasma gondii in milk and cheese from experimentally infected goats - (Peer Reviewed Journal) - (28-May-14)
Epidemiology of toxoplasmosis in white tailed deer (Odocoileus virginianus): occurrence, congenital transmission, correlates of infection, isolation, and genetic characterization of Toxoplasma gondii - (Peer Reviewed Journal)
Dubey, J.P., Dennis, P., Verma, S., Choudhary, S., Ferreira, L., Oliviera, S., Kwok, O.C., Butler, E., Carstensen, M., Su, C. 2014. Epidemiology of toxoplasmosis in white tailed deer (Odocoileus virginianus): occurrence, congenital transmission, correlates of infection, isolation, and genetic characterization of Toxoplasma gondii. Veterinary Parasitology. 202:27-275.
Isolation of viable neospora caninum from brains of wild gray wolves (canis lupus) - (Peer Reviewed Journal)
Dubey, J.P., Jenkins, M.C., Ferreira, L., Choudhary, S., Verma, S., Kwok, O.C., Fetterer, R.H., Butler, E., Carstensen, M. 2014. Isolation of viable neospora caninum from brains of wild gray wolves (canis lupus). Veterinary Parasitology. 201:150-153.
Use of filter papers to determine seroprevalence of Toxoplasma gondii among hunted ungulates - (Peer Reviewed Journal)
Aston, E., Mayer, P., Bowman, D., Mohammed, H., Liotta, J., Kwok, O.C., Dubey, J.P. 2014. Use of filter papers to determine seroprevalence of Toxoplasma gondii among hunted ungulates. International Journal for Parasitology: Parasites and Wildlife. 3:15-19.
Toxoplasma gondii seroprevalence in donkeys (Equus asinus) from the U.S.A. and isolation of T. gondii from cats on donkey farms - (Peer Reviewed Journal)
Dubey, J.P., Ness, S.L., Kwok, O.C., Choudhary, S., Mittel, L., Divers, T. 2014. Toxoplasma gondii seroprevalence in donkeys (Equus asinus) from the U.S.A. and isolation of T. gondii from cats on donkey farms. Veterinary Parasitology. 199: 18-23.
Isolation and genetic characterization of Toxoplasma gondii from mute swan (Cygnus olor) from the USA - (Peer Reviewed Journal)
Dubey, J.P., Choudhary, S., Kwok, O.C., Ferreira, L., Oliveira, S., Verma, S., Marks, D., Perdersen, K., Mickley, R., Randall, A., Arsone, D., Su, C. 2013. Isolation and genetic characterization of Toxoplasma gondii from mute swan (Cygnus olor) from the USA. Veterinary Parasitology. 195:42-46.
Isolation and genetic characterization of Toxoplasma gondii in the mongoose (Herpestes auropunctatus) in Grenada, West Indies - (Peer Reviewed Journal)
Choudhary, S., Zieger, U., Sharma, R., Chikweto, A., Tiwari, K., Ferreira, L., Oliveira, S., Barkley, L., Verma, S., Kwok, O.C., Su, C., Dubey, J.P. 2013. Isolation and genetic characterization of Toxoplasma gondii in the mongoose (Herpestes auropunctatus) in Grenada, West Indies. Journal of Zoo and Wildlife Medicine. 44:127-1130.
Seroprevalence of Toxoplasma gondii from free-range chickens (Gallus domesticus) from Addis Adaba, Ethiopa - (Peer Reviewed Journal)
Tilahun, G., Tiao, N., Ferreira, L.R., Choudhary, S., Oliveira, S., Verma, S.K., Kwok, O.C., Molla, B., Saville, W., Medhin, G., Kassa, T., Aleme, H., Gebreyes, W., Su, C., Dubey, J.P. 2013. Seroprevalence of Toxoplasma gondii from free-range chickens (Gallus domesticus) from Addis Adaba, Ethiopa. Journal of Parasitology. 99: 740-741.
A new atypical genotype mouse virulent strain of Toxoplasma gondii isolated from the heart of a wild caught puma (Felis concolor) from Durango, Mexico - (Peer Reviewed Journal)
Dubey, J.P., Alvarado-Esquivel, C., Herrera-Valenzuela, V., Gayosso-Dominguez, E., Oliveira, S., Verma, S., Choudhary, S., Kwok, O.C., Su, C. 2013. A new atypical genotype mouse virulent strain of Toxoplasma gondii isolated from the heart of a wild caught puma (Felis concolor) from Durango, Mexico. Veterinary Parasitology. 197:674-677.
Isolation and genetic characterization of Toxoplasma gondii from the gray wolf Canis lupus - (Peer Reviewed Journal)
Dubey, J.P., Choudhary, S., Ferreira, L., Kwok, O.C., Butler, E., Carstensen, M., Yu, L., Su, C. 2013. Isolation and genetic characterization of Toxoplasma gondii from the gray wolf Canis lupus. Veterinary Parasitology. 197:685-690.
Occurrence, isolation, and genetic characterization of Toxoplasma gondii from white tailed deer (Odocoileus virginianus) in New Jersey - (Peer Reviewed Journal)
Dubey, J.P., Randall, A., Choudhary, S., Ferreira, L., Verma, S., Oliveira, S., Kwok, O.C., Su, C. 2013. Occurrence, isolation, and genetic characterization of Toxoplasma gondii from white tailed deer (Odocoileus virginianus) in New Jersey. Journal of Parasitology. 99:763-769.
Congenital transmission of Neospora caninum in white tailed deer (Odocoileus virginianus) - (Peer Reviewed Journal)
Dubey, J.P., Jenkins, M.C., Kwok, O.C.H., Ferreira, L.R., Choudhary, S., Verma, S.K., Villena, I., Butler, E., Carstensen, M., 2013. Congenital transmission of Neospora caninum in white tailed deer (Odocoileus virginianus). Vet Parasitol. 196:519-522.
Isolation and characterization of new genetic types of toxoplasma gondii and prevalence of trichinella murrelli from black bear (Ursus americanus) - (Peer Reviewed Journal)
Dubey, J.P., Hill, D.E., Zarlenga, D.S., Choudhary, S., Ferreira, L., Oliveira, S., Verna, S., Kwok, O.C., Driscoll, C., Spiker, H., Su, C. 2013. Isolation and characterization of new genetic types of toxoplasma gondii and prevalence of trichinella murrelli from black bear (Ursus americanus). Veterinary Parasitology. 196:24-30.
Genotyping Toxoplasma gondii from wildlife in Pennsylvania and identification of natural recombinants virulent to mice - (Peer Reviewed Journal)
Dubey, J.P., Why, K., Verma, S., Choudhary, S., Kwok, O.C., Khan, A., Behinke, M., Sibley, L., Ferreira, L., Weaver, M., Stewart, R., Su, C. 2014. Genotyping Toxoplasma gondii from wildlife in Pennsylvania and identification of natural recombinants virulent to mice. Veterinary Parasitology. 200(2014):74-84.
Isolation of Viable Toxoplasma gondii from Tissues and Feces of Cats from Addis Ababa, Ethiopia - (Peer Reviewed Journal)
Dubey, J.P., Darrington, C., Tiao, N., Ferreira, L., Choudhary, S., Molla, B., Saville, W., Tilahun, G., Kwok, O.C., Gebreyes, W. 2013. Isolation of Viable Toxoplasma gondii from Tissues and Feces of Cats from Addis Ababa, Ethiopia. Journal of Parasitology. 99:56-58.
High prevalence of Toxoplasma gondii infection in Ethiopian cats in Addis Ababa, coinfection, and a review of toxoplasmosis in humans and other animals in Ethiopia - (Peer Reviewed Journal)
Tiao, N., Darrington, C.L., Molla, B., Saville, W.A., Tilahun, G., Kwok, O.C., Gebreyes, W.A., Lappin, M.R., Jones, J.L., Dubey, J.P. 2013. High prevalence of Toxoplasma gondii infection in Ethiopian cats in Addis Ababa, coinfection, and a review of toxoplasmosis in humans and other animals in Ethiopia. Epidemiology and Infection. 141:1029-1033.
Seroprevalence of Toxoplasma gondii and concurrent Bartonella spp., feline immunodeficiency virus, feline leukemia virus, and Dirofilaria immitis infections in Egyptian cats - (Peer Reviewed Journal)
Al-Kappany, Y.M., Lappin, M.R., Kwok, O.C., Abu-Elwafa, S.A., Hilali, M., Dubey, J.P. 2011. Seroprevalence of Toxoplasma gondii and concurrent Bartonella spp., feline immunodeficiency virus, feline leukemia virus, and Dirofilaria immitis infections in Egyptian cats. Journal of Parasitology. 97:256-258.
Seroprevalence of Neospora caninum in free-range chickens (Gallus domesticus) from the Americas - (Peer Reviewed Journal)
Martins, J., Kwok, O.C., Dubey, J.P. 2011. Seroprevalence of Neospora caninum in free-range chickens (Gallus domesticus) from the Americas. Veterinary Parasitology. dx.doi.org/10.1016/j.vetpar.2011.05.023.
Genetic characterization of Toxoplasma gondii in wildlife from North America revealed widespread and high prevalence of the fourth clonal type - (Peer Reviewed Journal)
Dubey, J.P., Velmurugan, G., Rajendran, C., Yabsley, M., Thomas, N.J., Beckman, K.B., Sinnett, D., Ruid, D., Paul, W., Hart, J., Fair, P.A., Mcfee, W.E., Shearn-Bochsler, V., Kwok, O.C., Ferreira, L., Choudhary, S., Faria, E.B., Zhou, H., Felix, T.A., Su, C. 2011. Genetic characterization of Toxoplasma gondii in wildlife from North America revealed widespread and high prevalence of the fourth clonal type. International Journal for Parasitology. 41:1139-1147.
Gray wolf (Canis lupus) is a natural definitive host for Neospora caninum - (Peer Reviewed Journal)
Dubey, J.P., Jenkins, M.C., Chellaiah, R., Miska, K.B., Ferreira, L., Martins, J., Kwok, O.C., Choudhary, S. 2011. Gray wolf (Canis lupus) is a natural definitive host for Neospora caninum. Veterinary Parasitology. 181:382-387.
Prevalence of antibodies to Toxoplasma gondii in dogs from northeastern Portugal - (Peer Reviewed Journal)
Lopes, A.P., Santos, H., Neto, F., Rodrigues, M., Kwok, O.C., Dubey, J.P., Carduso, L. 2011. Prevalence of antibodies to Toxoplasma gondii in dogs from northeastern Portugal. Journal of Parasitology. 97:418-420.
Detection of antibodies against Sarcocystis neurona, neospora spp., and Toxoplasma gondii in horses from Costa Rica - (Peer Reviewed Journal)
Dangoudoubiyam, S., Oliveira, J.B., Viquez, C., Gomez-Garcia, A., Gonzalez, O., Romero, J.J., Kwok, O.C., Dubey, J.P., Howe, D.K. 2011. Detection of antibodies against Sarcocystis neurona, neospora spp., and Toxoplasma gondii in horses from Costa Rica. Journal of Parasitology. 97:522-524.
High prevalence of toxoplasmosis in cats from Egypt: isolation of viable Toxoplasma Gondii, tissue distribution, and isolate designation - (Peer Reviewed Journal)
Al-Kappany, Y., Rajendran, C., Ferreira, L., Kwok, O.C., Abu-Elwafa, S., Hilali, M., Dubey, J.P. 2010. High prevalence of toxoplasmosis in cats from Egypt: isolation of viable Toxoplasma Gondii, tissue distribution, and isolate designation. Journal of Parasitology. 96:1115-1118.
Serological and parsitological prevalence of Toxoplasma gondii in wild birds from Colorado - (Peer Reviewed Journal)
Dubey, J.P., Felix, T.A., Kwok, O.C. 2010. Serological and parsitological prevalence of Toxoplasma gondii in wild birds from Colorado. Journal of Parasitology. 96:937-938.
Toxoplasmosis in sand cats (Felis margarita) and other animals in the Breeding Centre for Endangered Arabian Wildlife in the United Arab Emirates - (Peer Reviewed Journal)
Dubey, J.P., Pas, A., Chellaiah, R., Kwok, O.C., Su, C. 2010. Toxoplasmosis in sand cats (Felis margarita) and other animals in the Breeding Centre for Endangered Arabian Wildlife in the United Arab Emirates. Veterinary Parasitology. 172:195-203.
A new atypical highly mouse virulent Toxoplasma gondii genotype isolated from a wild black bear in Alaska - (Peer Reviewed Journal)
Dubey, J.P., Chellaiah, R., Ferreira, L.R., Kwok, O.C., Sinnett, D., Majumdar, D., Su, C. 2010. A new atypical highly mouse virulent Toxoplasma gondii genotype isolated from a wild black bear in Alaska. Journal of Parasitology. 96:713-716.
New Toxoplasma gondii genotypes isolated from free-range chickens from the Fernando de Noronha, Brazil: unexpected findings - (Peer Reviewed Journal)
Dubey, J.P., Chellaiah, R., Costa, D.G., Ferreria, L.R., Kwok, O.C., Qu, D., Su, C., Marvulo, M.F., Alves, L.C., Mota, R.A., Silva, J.C. 2010. New Toxoplasma gondii genotypes isolated from free-range chickens from the Fernando de Noronha, Brazil: unexpected findings. Journal of Parasitology. 96:709-712.
Seroprevalence of Toxoplasma gondii and concurrent bartonella spp., feline immunodeficiency virus, and feline leukemia infections in cats from Grenada, West Indies - (Peer Reviewed Journal)
Dubey, J.P., Lappin, M.R., Kwok, O.C., Mofya, S., Chikweto, A., Baffa, A., Doherty, D., Shakier, J., Macpherson, C.N., Sharma, R.N. 2009. Seroprevalence of Toxoplasma gondii and concurrent Bartonella spp., feline immunodeficiency virus, and feline leukemia infections in cats from Grenada, West Indies. Journal of Parasitology. 95:1129-1133.
Isolation and characterization of viable Toxoplasma gondii isolates revealed possible high frequency of mixed infection in feral cats (felis domesticus) from St. Kitts, West Indies - (Peer Reviewed Journal)
Dubey, J.P., Moura, L., Sundar, N., Velmurugan, G.V., Kwok, O.C., Kelly, P., Krecek, R.C., Majumdar, D., Su, C. 2009. Isolation and characterization of viable Toxoplasma gondii isolates revealed possible high frequency of mixed infection in feral cats (felis domesticus) from St. Kitts, West Indies. Parasitology. 136:589-594.
Seroprevalence of Neospora caninum and Toxoplasma gondii antibodies in white tailed deer (odocoileus virginianus) from Iowa and Minnesota using four serologic tests - (Peer Reviewed Journal)
Dubey, J.P., Jenkins, M.C., Kwok, O.C., Zink, R.L., Michalski, M.L., Ulrich, V., Gill, J., Cartensen, M., Thulliez, P. 2009. Seroprevalence of Neospora caninum and Toxoplasma gondii antibodies in white-tailed deer (odocoileus virginianus) from Iowa and Minnesota using four serologic tests. Veterinary Parasitology. 161:330-334.
Isolation of Toxoplasma Gondii from Animals in Durango, Mexico - (Peer Reviewed Journal)
Dubey, J.P., Velmurugan, G.V., Alvarado-Esquivel, C., Alvarado-Esquivel, D., Rodriquez-Pena, S., Martinez-Garcia, S., Gonzalez-Herrara, A., Ferreira, L.R., Kwok, O.C., Su, C. 2009. Isolation of Toxoplasma gondii from animals in Durango, Mexico. Journal of Parasitology. 95:319-322.
Seroprevalence of Toxoplasma Gondii Antibodies in Cats from Pennslyvania - (Peer Reviewed Journal)
Dubey, J.P., Bhatia, C., Ferreira, L., Thorn, A., Kwok, O.C. 2009. Seroprevalence of Toxoplasma gondii antibodies in cats from Pennsylvania. Journal of Parasitology. 95:578-580.
Toxoplasmosis in Captive Dolphins (Tursiops Truncatus) and Walrus (Odobenus Rosmrus) - (Peer Reviewed Journal)
Dubey, J.P., Mergl, J., Gehring, E., Sundar, N., Velmurugan, G., Kwok, O.C., Grigg, M., Su, C., Martineau, D. 2009. Toxoplasmosis in captive dolphins (Tursiops truncatus) and walrus (Odobenus rosmarus). Journal of Parasitology. 95:82-85.
Seroprevalence of Neospora Caninum and Toxoplasma Gondii in Black Tailed Deer (Odocoileus Hemionus Columbianus) and Mule Deer (Odocoileus Hemionus Hemionus) - (Peer Reviewed Journal)
Dubey, J.P., Mansfield, K., Hall, B., Kwok, O.C., Thulliez, P. 2008. Seroprevalence of neospora caninum and toxoplasma gondii in black-tailed deer (odocoileus hemionus columbianus) and mule deer (odocoileus hemionus hemionus). Veterinary Parasitology. 156:310-313.
Neospora Caninum Antibodies in Wild Carnivores from Spain - (Peer Reviewed Journal)
Sobrino, R., Dubey, J.P., Pabon, M., Linarez, N., Kwok, O.C., Millan, J., Arnal, M., Luco, D., Lopez-Gatius, F., Thulliez, P., Gortazar, C., Almeria, S. 2008. Neospora caninum antibodies in wild carnivores from spain. Veterinary Parasitology. 155:190-197.
Toxoplasma Gondii and Neospora Caninum Antibodies in Dogs from Grenada, West Indies - (Peer Reviewed Journal)
Dubey, J.P., Stone, D., Kwok, O.C., Sharma, R.N. 2008. Toxoplasma gondii and neospora caninum antibodies in dogs from Grenada, West Indies. Journal of Parasitology. 94:750-751.
Transplacental toxoplasmosis in naturally-infected white-tailed deer: isolation and genetic characterization of Toxoplasma gondii from foetuses of different gestational ages - (Peer Reviewed Journal)
Dubey, J.P., Velmurugan, G.V., Ulrich, V., Gill, J., Carstebseb, N., Sundar, N., Kwok, O.C., Thulliez, P., Su, C. 2008. Transplacental toxoplasmosis in naturally-infected white-tailed deer: isolation and genetic characterization of Toxoplasma gondii from foetuses of different gestational ages. International Journal for Parasitology. 38:1057-1063.
Isolation of Toxoplasma Gondii from Bottlenose Dolphins (Tursiops Truncatus) - (Peer Reviewed Journal)
Dubey, J.P., Fair, P.A., Sundar, N., Velmurugan, G., Kwok, O.C., Mcfee, W.E., Majumdar, D., Su, C. 2008. Isolation of toxoplasma gondii from bottlenose dolphins (tursiops truncatus). Journal of Parasitology. 94:821-823.
Toxoplasma gondii infection in lambs: high prevalence of live parasites, and genetic characterisation of T. gondii isolates revealed new genotypes - (Peer Reviewed Journal)
Dubey, J.P., Sundar, N., Hill, D.E., Velmurugan, G.V., Bandini, L.A., Kwok, O.C., Su, C. 2008. Toxoplasma gondii infection in lambs: high prevalence of live parasites, and genetic characterisation of T. gondii isolates revealed new genotypes. International Journal for Parasitology. 38:999-1006.
Rh: Dubey Et AL.-TOXOPLASMA Gondii from Cats in Puerto Rico Mouse Virulent Toxoplasma Gondii Isolated from Feralcats in Mona Island, Puerto Rico - (Peer Reviewed Journal)
Dubey, J.P., Lopez-Torres, N.Y., Sundar, N., Velmurugan, G.V., Kwok, O.C., Hill, R., Su, C. 2007. Mouse-virulent Toxoplasma gondii from feral cats in Mona Island, Puerto Rico. Journal of Parasitology. 93:1265-1369.
Isolation and Genetic Characterization of Toxoplasma Gondii from Raccoons (Procyon Lotor), Cats (Felis Domesticus), Striped Skunk (Mephitis Mephitis), Black Bear (Ursus Americanus), and Cougar (Puma Concolor) from Canada - (Peer Reviewed Journal)
Dubey, J.P., Quirk, T., Pitt, J.A., Sundar, N., Velmurugan, G., Kwok, O.C., Leelair, D., Hill, R., Su, C. 2008. Isolation and genetic characterization of toxoplasma gondii from raccoons (Procyon lotor), cats (Felis domesticus), striped skunk (Mephitis mephitis), black bear (Ursus americanus), and cougar (Puma concolor) from Canada. Journal of Parasitology. 9:42-45.
T. Gondii in Free-Range Chickens Seroprevalence and Isolation of Toxoplasma Gondii from Free-Range Chickens from Ghana, Indonesia, Italy, Poland, and Vietnam - (Peer Reviewed Journal)
Dubey, J.P., Huong, L.T., Lawson B, W.L., Subekti, D.T., Tassi, P., Cabaj, W., Sundar, N., Velmurugan, G.V., Kwok, O.C., Su, C. 2008. T. gondii in free-range chickens: seroprevalence and isolation of toxoplasma gondii from free-range chickens from Ghana, Indonesia, Italy, Poland, and Vietnam. Journal of Parasitology. 94:68-71.
Neosporosis in Beagle dogs clinical signs, diagnosis, treatment, isolation and genetic characterization of Neospora caninum. - (Peer Reviewed Journal)
Dubey, J.P., Vianna M, C.R., Kwok, O.C., Hill, D.E., Miska, K.B., Tuo, W., Velmurugan, G.V., Conors, M., Jenkins, M.C. 2007. Neosporosis in Beagle dogs clinical signs, diagnosis, treatment, isolation and genetic characterization of Neospora caninum. Veterinary Parasitology. 149:158-166.
Isolation and genotyping of Toxoplasma gondii from Ugandan chickens reveals frequent multiple infections - (Peer Reviewed Journal)
Lindstrom, I., Sundar, N., Lindh, J., Kironde, F., Kwok, O.C., Kabasa, J.D., Dubey, J.P., Smith, J.E. 2008. Isolation and genotyping of Toxoplasma gondii from Ugandan chickens reveals frequent multiple infections. Parasitology. 135:39-45.
Characterization of Toxoplasma Gondii from Raccoons (Procyon Lotor), Coyotes (Canis Latrans ), and Striped Skunks (Mephitis Mephitis) in Wisconsin Identified Several Atypical Genotypes - (Peer Reviewed Journal)
Dubey, J.P., Sundar, N., Nolden, C.A., Samuel, M.D., Velmurgan, G.V., Bandini, L., Kwok, O.C., Bodenstein, B., Su, C. 2007. Characterization of Toxoplasma gondii from raccoons (Procyon lotor), coyotes (Canis latrans ), and striped skunks (Mephitis mephitis) in Wisconsin identified several atypical genotypes. Journal of Parasitology. 93:1524-1527
Endemic avian toxoplasmosis on a farm in Illinois: clinical disease, diagnosis, biologic and genetic characteristics of Toxoplasma gondii isolates from chickens (Gallus domesticus), and a goose (Anser anser) - (Peer Reviewed Journal)
Dubey, J.P., Webb, D.M., Sundar, N., Velmurugan, G.V., Bandini, L.A., Kwok, O.C., Su, C. 2007. Endemic avian toxoplasmosis on a farm in Illinois: clinical disease, diagnosis, biologic and genetic characteristics of Toxoplasma gondii isolates from chickens (Gallus domesticus), and a goose (Anser anser). Veterinary Parasitology. 148:207-212.
Endemic toxoplasmosis in pigs on a farm in Maryland: Isolation and genetic characterization of toxoplasma gondii. - (Peer Reviewed Journal)
Dubey, J.P., Hill, D.E., Sundar, N., Velmurugan, G.V., Bandini, L.A., Kwok, O.C., Pierce, V., Kelly, K., Dulin, M., Su, C. 2008. Endemic toxoplasmosis in pigs on a farm in Maryland: Isolation and genetic characterization of toxoplasma gondii. Journal of Parasitology. 94:36-41.
Neospora Caninum and Toxoplasma Gondii Antibodies in Dogs from Durango City, Mexico - (Peer Reviewed Journal)
Dubey, J.P., Alvarado-Esquivel, C., Liesenfeld, O., Herrera-Flores, R.G., Ramirez-Sanchez, B.E., Gonzalez-Herrera, A., Martinez-Garcia, S.A., Bandini, L.A., Kwok, O.C. 2007. Neospora caninum and toxoplasma gondii antibodies in dogs from Durango City, Mexico. Journal of Parasitology. 93:1033-1035.
Molecular and biological characterisation of Toxoplasma gondii isolates from free-range chickens from Guyana, South America identified several unique and common parasite genotypes - (Peer Reviewed Journal)
Dubey, J.P., Applewhaite, L., Sundar, N., Velmurugan, G.V., Bandini, A., Kwok, O.C., Hill, R., Su, C. 2007. Molecular and biological characterisation of Toxoplasma gondii isolates from free-range chickens from Guyana, South America identified several unique and common parasite genotypes. Parasitology. 134:1559-1566.
Evaluation of four serological techniques to determine the seroprevalence of Neospora caninum in foxes (Vulpes vulpes) and coyotes (Canis latrans) on Prince Edward Island, Canada - (Peer Reviewed Journal)
Wapenaar, W., Barkema, H.W., Schares, G., Rouvinen-Watt, K., Zeijlemaker, L., Poorter, B., O’Handley, R.M., Kwok, O.C., Dubey, J.P. 2007. Evaluation of four serological techniques to determine the seroprevalence of Neospora caninum in foxes (Vulpes vulpes) and coyotes (Canis latrans) on Prince Edward Island, Canada. Veterinary Parasitology. 145:51-58.
Prevalence of Toxoplasma gondii in dogs from Sri Lanka and genetic characterization of the parasite isolates - (Peer Reviewed Journal)
Dubey, J.P., Rajapakse, R.P., Wijesundera, R.R., Sundar, N., Kwok, O.C., Su, C. 2007. Prevalence of Toxoplasma gondii in dogs from Sri Lanka and genetic characterization of the parasite isolates. Veterinary Parasitology. 146:341-346.
Genetic and biologic characterization of Toxoplasma gondii isolates of cats from China - (Peer Reviewed Journal)
Dubey, J.P., Zhu, X.Q., Sundar, N., Zhang, H., Kwok, O.C., Su, C. 2007. Genetic and biologic characterization of Toxoplasma gondii isolates of cats from China. Veterinary Parasitology. 145:352-356.
Diverse and Atypical Genotypes Identified in Toxoplasma Gondii from Dogs in São Paulo, Brazil - (Peer Reviewed Journal)
Dubey, J.P., Gennari, S.M., Sundar, N., Vianna Mannola, C.B., Bandini, L.M., Yai, L.E., Kwok, O.C., Su, C. 2007. Diverse and atypical genotypes identified in Toxoplasma gondii from dogs in São Paulo, Brazil. Journal of Parasitology. 93:60-64.
Comparison of serological methods for the diagnosis of Neospora caninum infection in cattle - (Peer Reviewed Journal)
Wapenaar, W., Barkema, H.W., Van Leeuwen, J.A., Mc Clure, J.T., O'Handley, R.M., Kwok, O.C., Thulliez, P., Dubey, J.P., Jenkins, M.C. 2007. Comparison of serological methods for the diagnosis of Neospora caninum infection in cattle. Veterinary Parasitology. 143:166-173.
Biologic and Genetic Comparison of Toxoplasma Gondii Isolates in Free-Range Chickens from the Northern Pará State and the Southern State Rio Grande Do Sul, Brazil Revealed Highly Diverse and Distinct Parasite Populations - (Peer Reviewed Journal)
Dubey, J.P., Sundar, N., Gennari, S.M., Minervino, A.H., Farias, N., Ruas, J.L., Santos, T., Cavalcante, G.T., Kwok, O.C., Su, C. 2007. Biologic and genetic comparison of Toxoplasma gondii isolates in free-range chickens from the northern pará state and the southern state Rio Grande do Sul, Brazil revealed highly diverse and distinct parasite populations. Veterinary Parasitology. 143:182-188.
Biologic and Genetic Characteristics of Toxoplasma Gondii in Free-Range Chickens from Nicaragua, Central America - (Peer Reviewed Journal)
Dubey, J.P., Su, C., Pineda, N., Kyvsgaard, N.C., Sundar, N., Luna, L.A., Rimbaud, E., Oliveira, J.B., Qi, Y., Kwok, O.C. 2006. Biologic and genetic characteristics of Toxoplasma gondii in free-range chickens from Nicaragua, Central America. Veterinary Parasitology. 142:47-53.
Prevalence of Toxoplasma Gondii in Rats (Rattus Norvegicus) in Grenada, West Indies - (Peer Reviewed Journal)
Dubey, J.P., Bhaiyat, M.I., Macpherson, C.L., De Allie, C., Chikweto, A., Kwok, O.C., Sharma, R.N. 2006. Prevalence of Toxoplasma gondii in rats (Rattus norvegicus) in Grenada, West Indies. Veterinary Parasitology. 92:1107-1108.
Characterization of Toxoplasmaa Gondii Isolates in Free-Range Chickens from Chile, South America - (Peer Reviewed Journal)
Dubey, J.P., Patitucci, A.N., Su, C., Sundar, N., Kwok, O.C., Shen, S.K. 2006. Characterization of Toxoplasmaa gondii isolates in free-range chickens from Chile, South America. Veterinary Parasitology. 140:76-82.
Characterization of Toxoplasma Gondii Isolates from Cats from Colombia, South America - (Peer Reviewed Journal)
Dubey, J.P., Su, C., Vecino, J.C., Sundar, N., Gomez, J.E., Lora, F., Jimenez, J., Kwok, O.C., Shen, S.K., Zhang, X., Nieto, A. 2006. Characterization of Toxoplasma gondii isolates from cats from Colombia, South America. Veterinary Parasitology. 141:42-47.
Biologic and Genetic Characteristics of Toxoplasma Gondii Isolates in Free-Range Chickens from Costa Rica, Central America - (Peer Reviewed Journal)
Dubey, J.P., Su, C., De Ikuverua, J.B., Morales, J.A., Bolanos, R.V., Sundar, N., Kwok, O.C., Shen, S.K. 2006. Biologic and genetic characteristics of toxoplasma gondii isolates in free-range chickens from costa rica, central america. Veterinary Parasitology. 139:29-36.
Genetic and Biologic Characteristics of Toxoplasma Gondii Isolates in Free-Range Chickens from Columbia, South America - (Peer Reviewed Journal)
Dubey, J.P., Gomez, J.E., Bedoya, A., Lora, F., Vianna, M., Hill, D.E., Kwok, O.C., Shen, S.K., Marcet, P.L., Lehmann, T. 2005. Genetic and biologic characteristics of toxoplasma gondii isolates in free-range chickens from Columbia, South America. Veterinary Parasitology. 134:67-72.
Prevalence of Viable Toxoplasma Gondii in Beef, Chicken, and Pork from Retail Meat Stores in the United States and Risk Assesment to Consumers - (Peer Reviewed Journal)
Dubey, J.P., Hill, D.E., Jones, J.L., Hightower, A.W., Kirkland, E., Roberts, J.M., Marcet, P.L., Lehmann, T., Vianna, M., Miska, K.B., Sreekumar, C., Kwok, O.C., Shen, S.K., Gamble, H.R. 2005. Prevalence of viable toxoplasma gondii in beef, chicken, and pork from retail meat stores in the united states and risk assesment to consumers. Journal of Parasitology 91:1082-1093.
Genetic and Biologic Characteristics of Toxoplasma Gondii Infections in Free-Range Chickens from Austria - (Peer Reviewed Journal)
Dubey, J.P., Edelhofer, R., Marcet, P., Vianna, M., Kwok, O.C., Lehmann, T. 2005. Genetic and biologic characteristics of Toxoplasma gondii infections in free-range chickens from Austria. Veterinary Parasitology 133:299-306.
A Comparison of Four Serologic Tests to Detect Antibodies to Toxoplasma Gondii in Naturally-Exposed Bottlenose Dolphins (Tursiops Truncatus). - (Peer Reviewed Journal)
Dubey, J.P., Fair, P.A., Bossart, G.D., Hill, D.E., Fayer, R., Sreekumar, C., Kwok, O.C., Thulliez, P. 2005. A comparison of four serologic tests to detect antibodies to toxoplasma gondii in naturally-exposed bottlenose dolphins (tursiops truncatus). Journal of Parasitology. 91:1074-1081.
Isolation, Tissue Distribution, and Molecular Characterization of Toxoplasma Gondii from Chickens from Grenada, West Indies. - (Peer Reviewed Journal)
Dubey, J.P., Bhalyat, M.I., Miska, K.B., Macpherson, C.N., Sharma, R.N., Sreekumar, C., Hill, D.E., Shen, S.K., Kwok, O.C., Lehmann, T. 2004. Isolation, tissue distribution, and molecular characterization of toxoplasma gondii from chickens from Grenada, West Indies. Journal of Parasitology. 91(3):557-560.
Biologic, Morphologic and Molecular Characterization of Neospora Caninum Isolates from Littermate Dogs - (Abstract Only)
Dubey, J.P., Sreekumar, C., Knickman, E., Miska, K.B., Vianna, M., Kwok, O.C., Hill, D.E., Jenkins, M.C., Lindsay, D.S., Greene, C.E. 2004. Biologic, morphologic and molecular characterization of neospora caninum isolates from littermate dogs (Abstract). COST 454 Annual Conference, Protozoal Reproduction Losses in Farm Ruminants. p.1.
First Biologic and Genetic Characterization of Toxoplasma Gondii Isolates from Chickens from Africa (Democratic Republic of Congo, Mali, Burkina Faso, and Kenya. - (Peer Reviewed Journal)
Dubey, J.P., Karhemere, S., Dahl, E., Sreekumar, C., Diabate, A., Dabire, K.R., Vianna, M.C., Kwok, O.C., Lehmann, T. 2004. First biologic and genetic characterization of Toxoplasma gondii isolates from chickens from Africa (Democratic Republic of Congo, Mali, Burkina Faso, and Kenya. Journal of Parasitology. 91(1):69-72.
Clinical, Biologic, Morphologic, and Molecular Characterisation of Neospora Caninum Infections in Littermate Dogs - (Peer Reviewed Journal)
Dubey, J.P., Sreekumar, C., Knickman, E., Miska, K.B., Vianna, M.C., Kwok, O.C., Hill, D.E., Jenkins, M.C., Lindsay, D.S., Greene, C.E. 2004. Clinical, biologic, morphologic, and molecular characterisation of neospora caninum infections in littermate dogs. International Journal for Parasitology 34:1157-1167.
Tissue Distribution and Molecular Chracterization of Chicken Isolates of Toxoplasma Gondii from Peru. - (Abstract Only)
Dubey, J.P., Levy, M., Sreekumar, C., Kwok, O.C., Shen, S.K., Dahl, E., Thulliez, P., Lehmann, T. 2004. Tissue distribution and molecular chracterization of chicken isolates of toxoplasma gondii from Peru. American Society of Parasitologists 90: 1015-1018.
Tissue Distribution and Molecular Characteizaton of Chicken Isolates of Toxoplasma Gondii from Peru - (Peer Reviewed Journal)
Dubey, J.P., Levy, M.Z., Sreekumar, C., Kwok, O.C., Shen, S.K., Dahl, E., Thulliez, P., Lehmann, T. 2004. Tissue distribution and molecular characterization of chicken isolates of Toxoplasma gondii from Peru. Journal of Parasitology. 90(5):1015-1018.
High Prevalence of Toxoplasma Gondii in a Commercial Flock of Chickens in Israel, and Public Health Implications of Free-Range Farming. - (Peer Reviewed Journal)
Dubey, J.P., Salant, H., Sreekumar, C., Dahl, E., Vianna, M.C., Shen, S.K., Kwok, O.C., Spira, D., Hamburger, J., Lehmann, T.V. 2004. High prevalence of Toxoplasma gondii in a commercial flock of chickens in Israel, and public health implications of free-range farming. Veterinary Parasitology. 121:317-322.
Molecular and Biologic Characteristics of Isolates of Toxoplasma Gondii from Wildlife in the United States - (Peer Reviewed Journal)
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., Sumners, J.A., Demarais, S., Humphreys, J.G., Lehmann, T. 2003. Molecular and biologic characteristics of isolates of toxoplasma gondii from wildlife in the united states. Journal of Parasitology 90:67-71.
Toxoplasma Gondii, Neospora Caninum, Sarcocystis Neurona, and Sarcocystis Canis-Like Infections in Marine Mammals - (Peer Reviewed Journal)
Dubey, J.P., Zarnke, R., Thomas, N.J., Wong, S.K., Van Bonn, W., Briggs, M., Davis, J.W., Ewing, R., Mensea, M., Kwok, O.C.H., Romand S., Thulliez, P. 2004. Toxoplasma gondii, Neospora caninum, Sarcocystis neurona, and Sarcocystis canis-like infections in marine mammals. Veterinary Parasitology. 116:275-296.
Isolation and Molecular Characteriatoin of Toxoplasma Gondii from Chickens and Ducks from Egypt - (Peer Reviewed Journal)
DUBEY, J.P., GRAHAM, D.H., DAHL, E., HILAI, M., EL-GHAYSH, A., SREEUMAR, C., KWOK, O.C., SHEN, S.K., LEHMANN, T. ISOLATION AND MOLECULAR CHARACTERIATOIN OF TOXOPLASMA GONDII FROM CHICKENS AND DUCKS FROM EGYPT. VETERINARY PARASITOLOGY 114:89-95, 2003.
Prevalence of Toxoplasma Gondii in Chickens from a Highly Endemic Area to Humans in Southern Brazil - (Peer Reviewed Journal)
Seipel Da Silva Azer, D., Bahia-Oliveira, L.M., Shen, S.K., Kwok, O.C., Lehman, T., Dubey, J.P. 2003. Prevalence of toxoplasma gondii in chickens from a highly endemic area to humans in southern brazil. Journal of Parasitology 89:394-396.
Prevalence of Antibodies to Neospora Caninum and Sarcocystis Neurona in Sera of Domestic Cats from Brazil - (Peer Reviewed Journal)
Dubey, J.P., Lindsay, D.S., Hill, D.E., Romand, S., Thulliez, P., Kwok, O.C., Silva, J., Oliveira-Camargo, M.C., Gennari, S.M. 2002. Prevalence of antibodies to neospora caninum and sarcocystis neurona in sera of domestic cats from brazil. Journal of Parasitology 88:1251-1252.
Occurrence of Neospora Caninum Antibodies in Sera from Dogs of the City of Sao Paulo, Brazil - (Peer Reviewed Journal)
Gennari, S.M., Yai, L.O., D'Auria, S.R., Cardoso, S.S., Kwok, O.C., Jenkins, M.C., Dubey, J.P. 2002. Occurrence of neospora caninum antibodies in sera from dogs of the city of sao paulo, brazil. Veterinary Parasitology 106:177-179.
Establishment of Besnoitia Darlingi from Opossums (Didelphis Virginiana) in Experimental Intermediate and Definitive Hosts, Propagation in Cell Culture, and Description of Ultrastructural and Genetic Characteristics - (Peer Reviewed Journal)
Dubey, J.P., Lindsay, D.S., Rosenthal, B.M., Sreekumar, C., Hill, D.E., Shen, S.K., Kwok, O.C., Rickard, L.G., Black, S.S., Rashmir-Raven, A. 2002. Establishment of besnoitia darlingi from opossums (didelphis virginiana) in experimental intermediate and definitive hosts, propagation in cell culture, and description of ultrastructural and genetic characteristics. International Journal for Parasitology 32:1053-1064.
Biological and Genetic Characterization of Toxoplasma Gondii Isolates from Chickens (Gallus Domesticus) from Sao Paulo, Brazil: Unexpected Findings - (Peer Reviewed Journal) - (20-Dec-01)
Sarcocystis Neurona Infections in Raccoons (Procyon Lotor): Evidence for Natural Infection with Sarcocysts, Transmission of Infection to Opossums (Didelphis Virginiana), and Experimental Induction of Neurologic Disease In - (Peer Reviewed Journal) - (06-Sep-01)
Isolates of Sarcocystis Falcatula-Like Organisms from South American Opossums Didelphis Marsupialis and Didelphis Albiventria from Sao Paulo, Brazil - (Peer Reviewed Journal) - (30-Aug-01)
First Isolation of Neospora Caninum from the Feces of a Naturally Infected Dog - (Peer Reviewed Journal) - (15-Jun-01)
The Gamma Interferon Knock Out Mouse Model for Sarcocystis Neurona: Com Parison of Infectivity of Sporocysts and Merozoites, and Routes of Inoculation - (Peer Reviewed Journal) - (30-May-01)
Diclazuril Therapy of Gamma Interferon Knockout Mice Fed Sarcocystis Neurona Sporocysts - (Peer Reviewed Journal) - (02-Nov-00)
Characteristics of a Recent Isolate of Sarcocystis Neurona (Sn7) from a Horse in Oregon - (Peer Reviewed Journal) - (18-Oct-00)
Serologic Survey for Toxoplasma Gondii in Lynx from Interior Alaska - (Peer Reviewed Journal) - (01-Oct-00)
First Isolation of Sarcocystis Neurona from the South American Opossum, Didelphis Albiventris, from Brazil - (Peer Reviewed Journal) - (01-Oct-00)
Prevelence of Sarcocystis Neurona Sporocysts in Opossums (Didelphis Virginiana) from Rural Mississippi - (Peer Reviewed Journal) - (01-Oct-00)
Prevalence of Antibodies to Toxoplasma Gondii in Ostriches (Struthio Camelus) - (Peer Reviewed Journal) - (01-Feb-00)
Serologic Survey of Neospora Caninum Infection in a Closed Dairy Cattle Herd in Maryland: Risk of Serologic Reactivity by Production Groups - (Peer Reviewed Journal) - (01-Feb-00)
Fatal Toxoplasmosis in Free-Ranging Endangered 'alala (Corvus Hawaiiensis) from Hawaiiensis) from Hawaii - (Peer Reviewed Journal) - (15-Sep-99)
Serologic Prevalence of Toxoplamsa Gondii in Horses Slaughtered for Food in North America - (Peer Reviewed Journal) - (22-Jul-99)
Serologic Survey for Toxoplasma Gondii in Caribou, Moose, Bison, Dall Sheep, Wolf, and Black Bear from Alaska - (Peer Reviewed Journal) - (05-Jul-99)
Infection and Immunity with the Rh Strain of Toxoplamsa Gondii in Rats - (Peer Reviewed Journal) - (10-Apr-99)
Prevalence of Antibodies to Neospora Caninum in Horses in North America - (Peer Reviewed Journal) - (10-Apr-99)
Toxoplasma Gondii Antibodies in Naturally Exposed Wild Coyotes, Red Foxes, and Gray Foxes and Serologic Diagnosis of Toxoplasmosis in Red Foxes Fed T.GONDII Oocysts and Tissue Cysts - (Peer Reviewed Journal) - (05-Jan-99)
Prevalence of Neospora Caninum and Toxoplasma Gondii Antibodies in Sera from Camels from Egypt - (Peer Reviewed Journal) - (22-Dec-98)
Canine Neosporosis: Clinical Signs, Diagnosis, Treatment and Isolation of Neospora Caninum in Mice and Cell Culture - (Peer Reviewed Journal) - (18-Jun-98)
Protective Immunity to Toxoplasmosis in Pigs Fed Irradiated Toxoplasma Gondii Oocysts - (Peer Reviewed Journal) - (24-May-98)
Seroprevalence of Neospora Caninum and Toxoplasma Gondii Antibodies in Water Buffaloes (Bubalus Bubalis) from Egypt - (Peer Reviewed Journal) - (16-Nov-97)
Low Seroprvalence of Toxoplasma Gondii in 1,264 Feral Pigs from a Remote Ossabaw Island - (Peer Reviewed Journal) - (20-Jun-97)
Antibody Responses of Cows During An Outbreak of Neosporosis Evaluated by Indirect Fluorescent Antibody Tests and Enzyme Linked Immunosorbent Assays - (Peer Reviewed Journal) - (10-May-97)
Oocyst-Induced Murine Toxoplasmosis: Life Cycle, Pathogenicity and Stage Conversion in Mice Fed Toxoplasma Gondii Oocysts - (Peer Reviewed Journal) - (20-Apr-97)
Toxoplasmosis in Rats (Rattus Norvegicus): Congenital Transmission to First and Second Generation Pups and Isolation of Toxoplasma Gondii from Seronegative Rats - (Peer Reviewed Journal) - (01-Feb-97)
Antibody Responses Measured by Various Serologic Tests in Pigs Orally Inoculated with Low Numbers of Toxoplasma Gondii Oocysts - (Peer Reviewed Journal) - (12-Sep-96)
Serologic Survey for Toxoplasma Gondii in Grizzly Bears (Ursu Arctos) from Alaska, 1973 to 1987 - (Peer Reviewed Journal) - (20-Jul-96)
Killing of Toxoplasma Gondii Oocysts by Irradiation - (Peer Reviewed Journal) - (13-Jun-96)
Infectivity of Low Numbers of Toxoplasma Gondii Oocysts to Pigs - (Peer Reviewed Journal) - (22-Nov-95)
Human Indoleamine 2,3-Dioxygenase Inhibits Toxoplasma Gondii Growth in Fibroblast Cells - (Peer Reviewed Journal) - (20-Jun-94)
Last Modified: 8/19/2014