Publications

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seroprevalence survey of borreliosis in children with chronic arthritis in british columbia, canada.a seroprevalence survey using an indirect immunofluorescence assay (ifa) for igg antibodies to borrelia hermsii and borrelia burgdorferi was conducted for varied pediatric chronic arthritis patients and a nonrheumatic control group in the province of british columbia, canada. overall, a higher rate of sera with ifa titers > or = 1/256 was found for b. hermsii (36.6%) compared to b. burgdorferi (12.5%). there were no significant differences among the arthritis subgroups and controls for the distr ...19921464879
serologic investigations of canine parvovirus and canine distemper in relation to wolf (canis lupus) pup mortalities.twenty-one serum samples from 18 wolves (canis lupus) were collected from 1985 to 1990 from northwestern montana (usa) and southeastern british columbia, canada, and evaluated for antibodies to canine parvovirus (cpv), canine distemper (cd), infectious canine hepatitis, and lyme disease; we found prevalences of 13 (65%) of 19, five (29%) of 17, seven (36%) of 19, and 0 of 20 wolves for these diseases, respectively. pups died or disappeared in three of the eight packs studied. in these three pack ...19948028116
evaluation of dogs as sero-indicators of the geographic distribution of lyme borreliosis in british columbia. 19968681288
mitochondrial dna sequence variation in ixodes pacificus (acari: ixodidae).the western black-legged tick, ixodes pacificus, is a primary vector of the spirochaete, borrelia burgdorferi, that causes lyme disease. we used variation in a 355-bp dna portion of the mitochondrial cytochrome oxidase iii gene to assess the population structure of the tick across its range from british columbia to southern california and east to utah. ixodes pacificus showed considerable haplotype diversity despite low nucleotide diversity. maximum parsimony and isolation-by-distance analyses r ...199910583539
migratory songbirds disperse ticks across canada, and first isolation of the lyme disease spirochete, borrelia burgdorferi, from the avian tick, ixodes auritulus.during a 3-yr comprehensive study, 196 ixodid ticks (9 species) were collected from 89 passerine birds (32 species) from 25 localities across canada to determine the distribution of avian-associated tick species and endogenous lyme disease spirochetes, borrelia burgdorferi johnson, schmid, hyde, steigerwalt, and brenner. we report the following first records of tick parasitism on avian hosts: the rabbit-associated tick, ixodes dentatus marx, from manitoba and ontario; the mouse tick, ixodes muri ...200517089744
ecological niche modeling of lyme disease in british columbia, canada.the purpose of this study was to describe the geographic distribution and model the ecological niche for borrelia burgdorferi (johnson, schmidt, hyde, steigerwaldt & brenner), ixodes pacificus (cooley & kohls), and ixodes angustus (neumann), the bacterium and primary tick vectors for lyme disease, in british columbia (bc), canada. we employed a landscape epidemiology approach using geographic information systems mapping and ecological niche modeling (genetic algorithm for rule-set prediction) to ...201020180315
exposure to infectious agents in dogs in remote coastal british columbia: possible sentinels of diseases in wildlife and humans.ranked among the top threats to conservation worldwide, infectious disease is of particular concern for wild canids because domestic dogs (canis familiaris) may serve as sources and reservoirs of infection. on british columbia's largely undeveloped but rapidly changing central and north coasts, little is known about diseases in wolves (canis lupus) or other wildlife. however, several threats exist for transfer of diseases among unvaccinated dogs and wolves. to gain baseline data on infectious ag ...201121461190
Widespread dispersal of Borrelia burgdorferi-infected ticks collected from songbirds across Canada.Abstract Millions of Lyme disease vector ticks are dispersed annually by songbirds across Canada, but often overlooked as the source of infection. For clarity on vector distribution, we sampled 481 ticks (12 species and 3 undetermined ticks) from 211 songbirds (42 species/subspecies) nationwide. Using PCR, 52 (29.5%) of 176 Ixodes ticks tested were positive for the Lyme disease spirochete, Borrelia burgdorferi s.l. Immature blacklegged ticks, Ixodes scapularis, collected from infested songbird ...201121864130
detection of borrelia genomospecies 2 in ixodes spinipalpis ticks collected from a rabbit in canada.lyme disease is a serious health problem, with many patients requiring in-depth clinical assessment and extended treatment. in the present study, we provide the first records of the western blacklegged tick, ixodes pacificus , and ixodes spinipalpis parasitizing eastern cottontails, sylvilagus floridanus . we also documented a triple co-infestation of 3 tick species (ixodes angustus, i. pacificus , i. spinipalpis) feeding on an eastern cottontail. notably, we discovered a unique member of the ly ...201727835071
management of tick bites and lyme disease during pregnancy.lyme disease results from the bite of a black-legged tick, populations of which have now become established in parts of nova scotia, southeastern quebec, southern ontario from the thousand islands through the geographic regions on the north shore of lake ontario and lake erie, southeastern manitoba, and british columbia's lower mainland, fraser valley, and vancouver island. it takes more than 24 hours of attachment to transfer the spirochete borrelia burgdorferi to the bitten animal or human. th ...201223231847
surveillance for borrelia burgdorferi in ixodes ticks and small rodents in british columbia.to determine the prevalence of borrelia burgdorferi in british columbian ticks, fieldwork was conducted over a 2-year period. in all, 893 ticks (ixodes pacificus, i. angustus, i. soricis, ixodes spp., and dermacentor andersoni) of different life stages were retrieved from 483 small rodents (peromyscus maniculatus, perognathus parvus, and reithrodontomys megalotis). b. burgdorferi dna was detected in 5 out of 359 tick pools, and 41 out of 483 mice were serologically confirmed to have antibodies a ...201526502354
isolation of borrelia burgdorferi in british columbia. 19938148784
borrelia burgdorferi isolated in british columbia. 19948075296
how big is the lyme problem? using novel methods to estimate the true number of lyme disease cases in british columbia residents from 1997 to 2008.lyme disease (ld) is rare in british columbia (bc) and, despite being a reportable condition since 1994, may be underreported. here we review all provincial laboratory and clinical databases to determine the number of ld cases reported in bc from 1997 to 2008. we analyzed demographic characteristics of ld cases and used capture-recapture methodology to estimate the true number of cases in bc for this period. from 1997 to 2008, 93 confirmed cases of ld were reported in bc. conservative capture-re ...201121413887
exposure and preventive behaviours toward ticks and lyme disease in canada: results from a first national survey.lyme disease (ld) risk is increasing in canada. in 2014, the government of canada launched a national communication campaign to raise awareness and promote the adoption of individual preventive behaviours toward ticks and ld. the objectives of this study were to evaluate and compare the adoption of ld preventive behaviours and the exposure to tick bites of canadians in the five main targeted regions (british columbia, prairie provinces, ontario, quebec and the atlantic provinces). a national sur ...201727771334
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