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Article

Monitoring Risk: Tick and Borrelia burgdorferi Public Participatory Surveillance in the Canadian Maritimes, 2012–2020

1
Department of Biology, Mount Allison University, Sackville, NB E4L 1G7, Canada
2
Département de Chimie et Biochimie, Université de Moncton, Moncton, NB E1A 3E9, Canada
3
Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
4
IWK Health Centre, Halifax, NS B3K 6R8, Canada
5
Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada
6
Department of Geography and Environment, Mount Allison University, Sackville, NB E4L 1G7, Canada
*
Author to whom correspondence should be addressed.
Contributed equally to this work.
Academic Editor: Alejandro Cabezas-Cruz
Pathogens 2021, 10(10), 1284; https://doi.org/10.3390/pathogens10101284
Received: 30 August 2021 / Revised: 29 September 2021 / Accepted: 30 September 2021 / Published: 6 October 2021
(This article belongs to the Special Issue Ticks and Tick-Borne Diseases―Pathogens, Parasites and People)
Ticks are vectors of many diseases, including Lyme disease (Ld). Lyme disease is an emerging disease in Canada caused by infection with the Lyme borreliosis (Lb) members of the Borrelia genus of spirochaete bacteria, of which Borrelia burgdorferi is regionally the most prevalent. The primary tick vector in central and eastern Canada, Ixodes scapularis, is increasing in numbers and in the geographical extent of established populations. This study documents the distribution of ticks recovered by passive surveillance, and their B. burgdorferi infection prevalence, in three Canadian Maritime provinces from 2012–2020. These regions represent areas in which tick populations are widely established, establishing, and considered non-established. Using a community science approach by partnering with veterinarians and members of the public, we collected over 7000 ticks from the 3 provinces. The three species found most often on companion animals and humans were I. scapularis (76.9%), Ixodes cookei (10.4%) and Dermacentor variabilis (8.9%). The most common hosts were dogs (60.5%), cats (16.8%) and humans (17.6%). As is typical of passive surveillance tick collections, the majority of ticks recovered were adult females; for I. scapularis 90.2%, 5.3%, 3.9% and 0.6% of the total of 5630 ticks recovered for this species were adult females, adult males, nymphs and larvae, respectively. The majority of B. burgdorferi-infected ticks were I. scapularis, as expected. Borrelia infection prevalence in I scapularis was higher in Nova Scotia (20.9%), the province with the most endemic regions, than New Brunswick (14.1%) and Prince Edward Island (9.1%), provinces thought to have established and non-established tick populations, respectively. The province-wide Borrelia infection prevalence generally increased in these latter tow provinces over the course of the study. The host did not have a significant effect on B. burgdorferi infection prevalence; I. scapularis ticks from dogs, cats, humans was, 13.3% (n = 3622), 15.6% (n = 817), 17.9% (n = 730), respectively. No I. scapularis larvae were found infected (n = 33) but B. burgdorferi was detected in 14.8% of both adults (n = 5140) and nymphs (n = 215). The incidence of B. burgdorferi infection also did not differ by engorgement status 15.0% (n = 367), 15.1% (n = 3101) and 14.4% (n = 1958) of non-engorged, engorged and highly engorged ticks, respectively, were infected. In New Brunswick, at the advancing front of tick population establishment, the province-wide infection percentages generally increased over the nine-year study period and all health district regions showed increased tick recoveries and a trend of increased percentages of Borrelia-infected ticks over the course of the study. Within New Brunswick, tick recoveries but not Borrelia infection prevalence were significantly different from endemic and non-endemic regions, suggesting cryptic endemic regions existed prior to their designation as a risk area. Over the 9 years of the study, tick recoveries increased in New Brunswick, the primary study region, and I. scapularis recoveries spread northwards and along the coast, most but not all new sites of recoveries were predicted by climate-based models, indicating that ongoing tick surveillance is necessary to accurately detect all areas of risk. Comparison of tick recoveries and public health risk areas indicates a lag in identification of risk areas. Accurate and timely information on tick distribution and the incidence of Borrelia and other infections are essential for keeping the public informed of risk and to support disease prevention behaviors. View Full-Text
Keywords: ticks; surveillance; Ixodes scapularis; Ixodes cookei; Dermacentor variabilis; Canada; Borrelia ticks; surveillance; Ixodes scapularis; Ixodes cookei; Dermacentor variabilis; Canada; Borrelia
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MDPI and ACS Style

Lewis, J.; Kirby, A.M.; Harris, K.D.; Filiaggi, C.L.; Foley-Eby, A.; Mann, M.; Lieske, D.; Lloyd, V.K. Monitoring Risk: Tick and Borrelia burgdorferi Public Participatory Surveillance in the Canadian Maritimes, 2012–2020. Pathogens 2021, 10, 1284. https://doi.org/10.3390/pathogens10101284

AMA Style

Lewis J, Kirby AM, Harris KD, Filiaggi CL, Foley-Eby A, Mann M, Lieske D, Lloyd VK. Monitoring Risk: Tick and Borrelia burgdorferi Public Participatory Surveillance in the Canadian Maritimes, 2012–2020. Pathogens. 2021; 10(10):1284. https://doi.org/10.3390/pathogens10101284

Chicago/Turabian Style

Lewis, Julie, Andrea M. Kirby, Kami D. Harris, Cory L. Filiaggi, Alexandra Foley-Eby, Malcolm Mann, David Lieske, and Vett K. Lloyd. 2021. "Monitoring Risk: Tick and Borrelia burgdorferi Public Participatory Surveillance in the Canadian Maritimes, 2012–2020" Pathogens 10, no. 10: 1284. https://doi.org/10.3390/pathogens10101284

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