Full Text Journal Articles by
Author Oliver C H Kwok

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Isolation and Genetic Characterization of Toxoplasma gondii from Tissues of Wild Turkeys (Meleagris gallopavo) in Pennsylvania.

Camila K Cerqueira-Cézar, Andressa F da Silva, Fernando H A Murata, Meghan Sadler, Ibrahim E Abbas, Oliver C H Kwok, Justin D Brown, Mary Jo Casalena, Mitchell R Blake, Chunlei Su, J P Dubey,

Toxoplasmosis in wild turkeys (Meleagris gallopavo) is of epidemiological interest because turkeys feed from the ground, and detection of infection in turkeys indicates contamination by oocysts in the environment. During the 2018 spring hunting season in Pennsylvania, fresh (unfixed, not frozen) samples were obtained from 20 harvested wild turkeys and ... Read more >>

J. Parasitol. (The Journal of parasitology)
[2019, 105(3):391-394]

Cited: 0 times

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Role of Rats ( Rattus norvegicus) in the Epidemiology of Toxoplasma gondii Infection in Grenada, West Indies.

Fernando H A Murata, Camila K Cerqueira-Cézar, Oliver C H Kwok, Keshaw Tiwari, Ravindra N Sharma, Chunlei Su, J P Dubey,

Rodents are known to be reservoir hosts of Toxoplasma gondii infection for other animals, such as cats and pigs. From February to July 2017, 167 rats ( Rattus norvegicus) were trapped in Grenada, and serum, heart, skeletal muscle, and brain were examined for T. gondii infection by serological examination (modified ... Read more >>

J. Parasitol. (The Journal of parasitology)
[2018, 104(5):571-573]

Cited: 1 time

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Environmental and behavioral changes may influence the exposure of an Arctic apex predator to pathogens and contaminants.

Todd C Atwood, Colleen Duncan, Kelly A Patyk, Pauline Nol, Jack Rhyan, Matthew McCollum, Melissa A McKinney, Andrew M Ramey, Camila K Cerqueira-Cézar, Oliver C H Kwok, Jitender P Dubey, Steven Hennager,

Recent decline of sea ice habitat has coincided with increased use of land by polar bears (Ursus maritimus) from the southern Beaufort Sea (SB), which may alter the risks of exposure to pathogens and contaminants. We assayed blood samples from SB polar bears to assess prior exposure to the pathogens ... Read more >>

Sci Rep (Scientific reports)
[2017, 7(1):13193]

Cited: 2 times

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Experimental Neospora caninum infection in chickens (Gallus gallus domesticus) with oocysts and tachyzoites of two recent isolates reveals resistance to infection.

Solange Oliveira, Juliana Aizawa, Herbert Sousa Soares, Daniela Pontes Chiebao, Márcio Botelho de Castro, Aline S Hora, Marcos Gomes Lopes, Gereon Schares, Mark C Jenkins, Oliver C H Kwok, Ricardo Augusto Dias, Solange Maria Gennari, Jitender P Dubey, Hilda Fátima Jesus Pena,

The importance of birds in the biological cycle of Neospora caninum is not clear. We report unsuccessful Neospora infection in chickens (Gallus gallus domesticus) using two isolates of N. caninum. In experiment #1, 30 White Leghorn chickens were orally inoculated with viable N. caninum oocysts (NC-SP1 isolate, 200 oocysts per ... Read more >>

Int. J. Parasitol. (International journal for parasitology)
[2018, 48(2):117-123]

Cited: 0 times

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Prevalence and genetic characterization of Toxoplasma gondii in free-range chickens from grocery stores and farms in Maryland, Ohio and Massachusetts, USA.

Yuqing Ying, Shiv K Verma, Oliver C H Kwok, Fatima Alibana, Rima Mcleod, Chunlei Su, Jitender P Dubey, Abani K Pradhan,

Chickens are considered important in the epidemiology of Toxoplasma gondii. Chicken hearts (n = 1185) obtained from grocery stores were tested for T. gondii infection. Antibodies to T. gondii were assayed in fluid removed from the heart cavity using the modified agglutination test (MAT) at 1:5, 1:25, and 1:100 dilutions. MAT antibodies ... Read more >>

Parasitol. Res. (Parasitology research)
[2017, 116(5):1591-1595]

Cited: 0 times

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High seroprevalence of Toxoplasma gondii in elk (Cervus canadensis) of the central Appalachians, USA.

John J Cox, Brittany Slabach, John T Hast, Sean M Murphy, Oliver C H Kwok, Jitender P Dubey,

Toxoplasma gondii is an important protozoan parasite of mammals that impacts animal health and behavior. Although this parasite has been documented in several cervid species, including red deer (Cervus elaphus) in Europe, little is known about T. gondii impacts on the closely related North American counterpart, the elk (wapiti, Cervus ... Read more >>

Parasitol. Res. (Parasitology research)
[2017, 116(3):1079-1083]

Cited: 0 times

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Seroepidemiologic study on the prevalence of Toxoplasma gondii and Trichinella spp. infections in black bears (Ursus americanus) in Pennsylvania, USA.

Jitender P Dubey, Justin Brown, Mark Ternent, Shiv K Verma, Dolores E Hill, Camila K Cerqueira-Cézar, Oliver C H Kwok, Rafael Calero-Bernal, Jan G Humphreys,

The protozoan Toxoplasma gondii and the metazoan Trichinella spp. infect virtually all warm-blooded animals, including birds, humans, livestock, and marine mammals. Both parasitic infections can cause serious illness in human beings and can be acquired by ingesting under-cooked meat harboring infective stages. Approximately 3500 black bears (Ursus americanus) are legally-harvested ... Read more >>

Vet. Parasitol. (Veterinary parasitology)
[2016, 229:76-80]

Cited: 0 times

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Antibody Detection and Molecular Characterization of Toxoplasma gondii from Bobcats (Lynx rufus), Domestic Cats (Felis catus), and Wildlife from Minnesota, USA.

Shiv K Verma, Larissa Minicucci, Darby Murphy, Michelle Carstensen, Carolin Humpal, Paul Wolf, Rafael Calero-Bernal, Camila K Cerqueira-Cézar, Oliver C H Kwok, Chunlei Su, Dolores Hill, Jitender P Dubey,

Little is known of the epidemiology of toxoplasmosis in Minnesota. Here, we evaluated Toxoplasma gondii infection in 50 wild bobcats (Lynx rufus) and 75 other animals on/near 10 cattle farms. Antibodies to T. gondii were assayed in serum samples or tissue fluids by the modified agglutination test (MAT, cut-off 1:25). Twenty ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2016, 63(5):567-571]

Cited: 2 times

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Toxoplasmosis in geese and detection of two new atypical Toxoplasma gondii strains from naturally infected Canada geese (Branta canadensis).

Shiv Kumar Verma, Rafael Calero-Bernal, Camila K Cerqueira-Cézar, Oliver C H Kwok, Mike Dudley, Tiantian Jiang, Chunlei Su, Dolores Hill, Jitender P Dubey,

Wild birds are important in the epidemiology of toxoplasmosis because they can serve as reservoir hosts, and vectors of zoonotic pathogens including Toxoplasma gondii. Canada goose (Branta canadensis) is the most widespread geese in North America. Little is known concerning T. gondii infection in both migratory, and local resident populations ... Read more >>

Parasitol. Res. (Parasitology research)
[2016, 115(5):1767-1772]

Cited: 5 times

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Isolation and Genetic Characterization of Toxoplasma gondii from Black Bears (Ursus americanus), Bobcats (Lynx rufus), and Feral Cats (Felis catus) from Pennsylvania.

Jitender P Dubey, Shiv K Verma, Rafael Calero-Bernal, Ana B Cassinelli, Oliver C H Kwok, Kyle Van Why, Chunlei Su, Jan G Humphreys,

Toxoplasma gondii infects virtually all warm-blooded hosts worldwide. Recently, attention has been focused on the genetic diversity of the parasite to explain its pathogenicity in different hosts. It has been hypothesized that interaction between feral and domestic cycles of T. gondii may increase unusual genotypes in domestic cats and facilitate ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2015, 62(3):410-415]

Cited: 3 times

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Isolation and RFLP genotyping of Toxoplasma gondii from the mongoose (Herpestes auropunctatus) in Grenada, West Indies.

Shanti Choudhary, Ulrike Zieger, Ravindra N Sharma, Alfred Chikweto, Keshaw P Tiwari, Leandra R Ferreira, Solange Oliveira, Lovell J Barkley, Shiv Kumar Verma, Oliver C H Kwok, Chunlei Su, J P Dubey,

Little is known of the genetic diversity and epidemiology of Toxoplasma gondii infection in wildlife in Caribbean Islands. The prevalence and genetic diversity of T. gondii in mongooses (Herpestes auropunctatus) was investigated. During 2011 and 2012, 91 mongooses were trapped in different parts of Grenada, bled, euthanized, and examined at ... Read more >>

J. Zoo Wildl. Med. (Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians)
[2013, 44(4):1127-1130]

Cited: 4 times

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