Publications

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epidemiological characteristics of an invading parasite: dicrocoelium dendriticum in sympatric wapiti and beef cattle in southern alberta, canada.previous surveys of wild ungulates indicate that the liver fluke, dicrocoelium dendriticum, was rare in the cypress hills area of southeastern alberta. however, 41 of 59 wapiti (cervus elaphus) sampled during the 2003 and 2004 hunting seasons from this region were infected, with 7 hosts containing >1,000 worms. prevalence and mean intensity were similarly high in sympatric beef cattle and mule deer. worm abundance in wapiti was age related, with calves containing significantly higher numbers of ...200717626339
diseases of wapiti utilizing cattle range in southwestern alberta.specimens from 28 wapiti (cervus elaphus canadensis) were collected by hunters in southwestern alberta in 1984. various tests were performed to detect infections and conditions that could affect cattle sharing the range or cause disease in wapiti. serum antibodies were present against leptospiral serovars autumnalis (25%), bratislava (4%), and icterohaemorrhagiae (8%), and the viruses of bovine virus diarrhea (52%), infectious bovine rhinotracheitis (45%), and parainfluenza type 3 (13%). no sero ...19873029443
life cycle, host utilization, and ecological fitting for invasive lancet liver fluke, dicrocoelium dendriticum, emerging in southern alberta, canada.the expansion of parasite distributions outside of their native host and geographical ranges has occurred repeatedly over evolutionary time. contemporary examples include emerging infectious diseases (eid's), many of which pose threats to human, domestic animal, and wildlife populations. theory predicts that parasites with complex life cycles will be rare as eid's due to constraints imposed by host specialization at each life-cycle stage. in contrast to predictions of this theory, we report 2 ne ...201728211758
first report of fasciola hepatica in cattle in alberta. 19989759512
multiple origins of european populations of the giant liver fluke fascioloides magna (trematoda: fasciolidae), a liver parasite of ruminants.the giant liver fluke, fascioloides magna, a liver parasite of free-living and domestic ruminants of europe and north america, was analysed in order to determine the origin of european populations and to reveal the biogeography of this originally north american parasite on the european continent. the variable fragments of the mitochondrial cytochrome c oxidase subunit i (cox1; 384bp) and nicotinamide dehydrogenase subunit i (nad1; 405bp) were used. phylogenetic trees and haplotype networks were ...201021172350
survey of fascioloides magna in farmed wapiti in alberta.the formalin-ethyl acetate sedimentation procedure was used to detect ova of the giant liver fluke, fascioloides magna, in feces of farmed wapiti in alberta. twenty (3.2%) of the 629 fecal samples examined contained ova of f. magna. thirteen (33.3%) of the 39 farms surveyed had wapiti positive for f. magna. the presence of f. magna in farmed wapiti north of the north saskatchewan river is confirmed, and 3 areas where the infection has become endemic are identified.199910200881
an expanding population of the giant liver fluke (fascioloides magna) in elk (cervus canadensis) and other ungulates in canada.giant liver fluke (fascioloides magna) populations readily expand under suitable conditions. although extirpated from the eastern slopes of the canadian rocky mountains in the early 1960s, the fluke reappeared following natural spread through mountain passes from british columbia. herein, we assessed epizootiology of the fluke population two decades later. between 1984 and 1991, 534 ungulates, including 381 elk (cervus canadensis), 68 mule deer (odocoileus hemionus hemionus), 54 white-tailed dee ...201525647594
survey of hepatic and pulmonary helminths of wild cervids in alberta, canada.during the 1988 hunting season, livers and lungs from 263 mule deer (odocoileus hemionus hemionus), 198 moose (alces alces), 147 white-tailed deer (odocoileus virginianus), and 94 wapiti (cervus elaphus nelsoni) from alberta (canada) were collected for parasitological examination. most of the samples (89%) were submitted by big game hunters throughout the province. giant liver fluke (fascioloides magna) was found in 9% of 22 yearling and 29% of 65 adult wapiti; 4% of 161 adult moose; and 2% of 9 ...19902250321
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