Publications

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antibodies to selected pathogens in free-ranging terrestrial carnivores and marine mammals in canada.antibody titres to selected pathogens (canine adenovirus [cav-2], feline herpesvirus [fhv], phocine herpesvirus [phv-1], canine distemper virus, dolphin morbillivirus [dmv], phocine distemper virus [pdv], parainfluenza virus type 3 [pi3], rabies virus, dolphin rhabdovirus [drv], canine coronavirus, feline coronavirus, feline leukaemia virus, borrelia burgdorferi and toxoplasma gondii) were determined in whole blood or serum samples from selected free-ranging terrestrial carnivores and marine mam ...200415338705
clinical sarcocystis neurona, sarcocystis canis, toxoplasma gondii, and neospora caninum infections in dogs.sarcocystis neurona, sarcocystis canis, toxoplasma gondii, and neospora caninum are related apicomplexans that can cause systemic illness in many species of animals, including dogs. we investigated one breeder's 25 basset hounds for these infections. in addition, tissues from dogs and other non-canine hosts previously reported as s. canis infections were studied retrospectively. schizonts resembling those of s. neurona, and recognized by polyclonal rabbit anti-s. neurona antibodies, were found i ...200616458431
fatal hepatic sarcocystosis in two polar bears (ursus maritimus).fatal hepatic sarcocystosis was diagnosed in 2 polar bears from a zoo in anchorage, alaska. gross lesions were icterus and systemic petechiae. marked microscopic lesions were detected only in the liver and included severe random necrotizing hepatitis with hemorrhage. only asexual stages of an apicomplexan parasite were detected within hepatocytes, and rare extracellular zoites were seen in foci of necrosis. the parasite divided by endopolygeny, and occasionally merozoites formed rosettes around ...19979194839
latitudinal variability in the seroprevalence of antibodies against toxoplasma gondii in non-migrant and arctic migratory geese.toxoplasma gondii is an intracellular coccidian parasite found worldwide and is known to infect virtually all warm-blooded animals. it requires a cat (family felidae) to complete its full life cycle. despite the absence of wild felids on the arctic archipelago of svalbard, t. gondii has been found in resident predators such as the arctic fox and polar bear. it has therefore been suggested that t. gondii may enter this ecosystem via migratory birds. the objective of this study was to identify loc ...201223339847
serosurvey for trichinella in polar bears (ursus maritimus) from svalbard and the barents sea.blood samples of live-caught polar bears (ursus maritimus) from svalbard collected 1991-2000 (period 1) and 2006-2008 (period 2) and from the pack ice of the barents sea collected in period 1, were assayed for antibodies against trichinella spp. by elisa. of 54 cubs-of-the-year included in the period 1 sample, 53 were seronegative, indicating that exposure to trichinella infected meat is uncommon during the first months of life for polar bears in the svalbard region. of 30 mother-offspring pairs ...201020797484
morbillivirus and toxoplasma exposure and association with hematological parameters for southern beaufort sea polar bears: potential response to infectious agents in a sentinel species.arctic temperatures are increasing in response to greenhouse gas forcing and polar bears have already responded to changing conditions. declines in body stature and vital rates have been linked to warming-induced loss of sea-ice. as food webs change and human activities respond to a milder arctic, exposure of polar bears and other arctic marine organisms to infectious agents may increase. because of the polar bear's status as arctic ecosystem sentinel, polar bear health could provide an index of ...201020607348
prevalence of antibodies against toxoplasma gondii in polar bears (ursus maritimus) from svalbard and east greenland.serum samples from 419 polar bears (ursus maritimus) from svalbard and the barents sea (collected 1990-2000) and 108 polar bears from east greenland (collected 1999-2004) were assayed for antibodies against toxoplasma gondii using the modified agglutination test. antibody prevalences were 3.6% among cubs dependent on their mothers and 21.4% among subadults and adults. among subadults and adults there was an interaction between population and sex, with similar prevalences among females (svalbard ...200918578588
serosurvey of selected zoonotic agents in polar bears (ursus maritimus).between 1982 and 1999 blood samples were collected from 500 polar bears (ursus maritimus) captured in the beaufort and chukchi seas, to determine the seroprevalence of brucella species, toxoplasma gondii, and trichinella species infections. the bears were classified into four age groups, cubs, yearlings, subadults and adults. brucella and toxoplasma antibodies were detected by agglutination (a buffered acidified card antigen and rapid automated presumptive test for brucellosis and a commercial l ...200515658561
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