1
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Williams AK, Peterman WE, Pesapane R. Refining Ixodes scapularis (Acari: Ixodidae) distribution models: a comparison of current methods to an established protocol. JOURNAL OF MEDICAL ENTOMOLOGY 2024; 61:827-844. [PMID: 38686854 DOI: 10.1093/jme/tjae052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 03/11/2024] [Accepted: 04/15/2024] [Indexed: 05/02/2024]
Abstract
Blacklegged ticks (Ixodes scapularis Say) pose an enormous public health risk in eastern North America as the vector responsible for transmitting 7 human pathogens, including those causing the most common vector-borne disease in the United States, Lyme disease. Species distribution modeling is an increasingly popular method for predicting the potential distribution and subsequent risk of blacklegged ticks, however, the development of such models thus far is highly variable and would benefit from the use of standardized protocols. To identify where standardized protocols would most benefit current distribution models, we completed the "Overview, Data, Model, Assessment, and Prediction" (ODMAP) distribution modeling protocol for 21 publications reporting 22 blacklegged tick distribution models. We calculated an average adherence of 73.4% (SD ± 29%). Most prominently, we found that authors could better justify and connect their selection of variables and associated spatial scales to blacklegged tick ecology. In addition, the authors could provide clearer descriptions of model development, including checks for multicollinearity, spatial autocorrelation, and plausibility. Finally, authors could improve their reporting of variable effects to avoid undermining the models' utility in informing species-environment relationships. To enhance future model rigor and reproducibility, we recommend utilizing several resources including the ODMAP protocol, and suggest that journals make protocol compliance a publication prerequisite.
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Affiliation(s)
- Allison K Williams
- School of Environment and Natural Resources, College of Food, Agriculture, and Environmental Science, The Ohio State University, 210 Kottman Hall, 2021 Coffey Road, Columbus, OH 43210, USA
| | - William E Peterman
- School of Environment and Natural Resources, College of Food, Agriculture, and Environmental Science, The Ohio State University, 210 Kottman Hall, 2021 Coffey Road, Columbus, OH 43210, USA
| | - Risa Pesapane
- School of Environment and Natural Resources, College of Food, Agriculture, and Environmental Science, The Ohio State University, 210 Kottman Hall, 2021 Coffey Road, Columbus, OH 43210, USA
- Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, 1920 Coffey Road, Columbus, OH 43210, USA
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2
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Murison K, Wilson CH, Clow KM, Gasmi S, Hatchette TF, Bourgeois AC, Evans GA, Koffi JK. Epidemiology and clinical manifestations of reported Lyme disease cases: Data from the Canadian Lyme disease enhanced surveillance system. PLoS One 2023; 18:e0295909. [PMID: 38100405 PMCID: PMC10723709 DOI: 10.1371/journal.pone.0295909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 12/01/2023] [Indexed: 12/17/2023] Open
Abstract
Lyme disease cases reported in seven Canadian provinces from 2009 to 2019 through the Lyme Disease Enhanced Surveillance System are described herein by demographic, geography, time and season. The proportion of males was greater than females. Bimodal peaks in incidence were observed in children and older adults (≥60 years of age) for all clinical signs except cardiac manifestations, which were more evenly distributed across age groups. Proportions of disease stages varied between provinces: Atlantic provinces reported mainly early Lyme disease, while Ontario reported equal proportions of early and late-stage Lyme disease. Early Lyme disease cases were mainly reported between May through November, whereas late Lyme disease were reported in December through April. Increased awareness over time may have contributed to a decrease in the proportion of cases reporting late disseminated Lyme disease. These analyses help better describe clinical features of reported Lyme disease cases in Canada.
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Affiliation(s)
- Kiera Murison
- Infectious Diseases and Vaccination Programs Branch, Public Health Agency of Canada, Ottawa, Ontario, Canada
| | - Christy H. Wilson
- Infectious Diseases and Vaccination Programs Branch, Public Health Agency of Canada, Ottawa, Ontario, Canada
| | - Katie M. Clow
- Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada
| | - Salima Gasmi
- Infectious Diseases and Vaccination Programs Branch, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
| | - Todd F. Hatchette
- Department of Pathology and Laboratory Medicine, Nova Scotia Health Authority, Departments of Pathology, Immunology and Microbiology, Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Annie-Claude Bourgeois
- Infectious Diseases and Vaccination Programs Branch, Public Health Agency of Canada, Ottawa, Ontario, Canada
| | - Gerald A. Evans
- Infection Prevention & Control, Kingston Health Sciences Centre, Biomedical & Molecular Sciences and Pathology & Molecular Medicine, Queen’s University, Kingston, Ontario, Canada
| | - Jules K. Koffi
- Infectious Diseases and Vaccination Programs Branch, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
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3
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Fan X, Ma R, Yue C, Liu J, Yue B, Yang W, Li Y, Gu J, Ayala JE, Bunker DE, Yan X, Qi D, Su X, Li L, Zhang D, Zhang H, Yang Z, Hou R, Liu S. A snapshot of climate drivers and temporal variation of Ixodes ovatus abundance from a giant panda living in the wild. Int J Parasitol Parasites Wildl 2023; 20:162-169. [PMID: 36890989 PMCID: PMC9986245 DOI: 10.1016/j.ijppaw.2023.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/21/2023] [Accepted: 02/21/2023] [Indexed: 03/03/2023]
Abstract
Ticks and tick-borne diseases have negative impacts on the health of wild animals including endangered and vulnerable species. The giant panda (Ailuropoda melanoleuca), a vulnerable and iconic flagship species, is threatened by tick infestation as well. Not only can ticks cause anemia and immunosuppression in the giant panda, but also bacterial and viral diseases. However, previous studies regarding tick infestation on giant pandas were limited in scope as case reports from sick or dead animals. In this study, an investigation focusing on the tick infestation of a reintroduced giant panda at the Daxiangling Reintroduction Base in Sichuan, China was conducted. Ticks were routinely collected and identified from the ears of the giant panda from March to September in 2021. A linear model was used to test the correlation between tick abundance and climate factors. All ticks were identified as Ixodes ovatus. Tick abundance was significantly different among months. Results from the linear model showed temperature positively correlated to tick abundance, while air pressure had a negative correlation with tick abundance. To the best of our knowledge, this study is the first reported investigation of tick species and abundance on a healthy giant panda living in the natural environment, and provides important information for the conservation of giant pandas and other species sharing the same habitat.
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Affiliation(s)
- Xueyang Fan
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Rui Ma
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Changjuan Yue
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Jiabin Liu
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Bisong Yue
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, 610064, Sichuan, China
| | - Wanjing Yang
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Yunli Li
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Jiang Gu
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - James E Ayala
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Daniel E Bunker
- Department of Biological Sciences, New Jersey Institute of Technology, Newark, NJ, 07102, USA
| | - Xia Yan
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Dunwu Qi
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Xiaoyan Su
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Lin Li
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Dongsheng Zhang
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Hongwen Zhang
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Zhisong Yang
- Sichuan Academy of Giant Panda, Chengdu, 610081, China
| | - Rong Hou
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
| | - Songrui Liu
- Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, 1375 Panda Road, Chenghua District, Sichuan Province, 610081, China
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4
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Lee JS, Chung SY. The Threat of Climate Change on Tick-Borne Infections: Rising Trend of Infections and Geographic Distribution of Climate Risk Factors Associated With Ticks. J Infect Dis 2023; 227:295-303. [PMID: 35861295 DOI: 10.1093/infdis/jiac300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 07/11/2022] [Accepted: 07/20/2022] [Indexed: 01/14/2023] Open
Abstract
Ticks transmit a wide range of pathogens. The spread of tick-borne infections is an emerging, yet often overlooked, threat in the context of climate change. The infections have rapidly increased over the past few years in South Korea despite no significant changes in socioeconomic circumstances. We investigated the impact of climate change on the surge of tick-borne infections and identified potential disease hot spots at a resolution of 5 km by 5 km. A composite index was constructed based on multiple climate and environmental indicators and compared with the observed tick-borne infections. The surge of tick-borne episodes corresponded to the rising trend of the index over time. High-risk areas identified by the index can be used to prioritize locations for disease prevention activities. Monitoring climate risk factors may provide an opportunity to predict the spread of the infections in advance.
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Affiliation(s)
- Jung-Seok Lee
- Department of Zoology, University of Oxford, Oxford, United Kingdom.,International Vaccine Institute, Seoul, South Korea
| | - Suh-Yong Chung
- Division of International Studies, Korea University, Seoul, South Korea
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5
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Pelletier J, Rocheleau JP, Aenishaenslin C, Dimitri Masson G, Lindsay LR, Ogden NH, Bouchard C, Leighton PA. Fluralaner Baits Reduce the Infestation of Peromyscus spp. Mice (Rodentia: Cricetidae) by Ixodes scapularis (Acari: Ixodidae) Larvae and Nymphs in a Natural Environment. JOURNAL OF MEDICAL ENTOMOLOGY 2022; 59:2080-2089. [PMID: 35980603 DOI: 10.1093/jme/tjac106] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Indexed: 06/15/2023]
Abstract
The development of interventions that reduce Lyme disease incidence remains a challenge. Reservoir-targeted approaches aiming to reduce tick densities or tick infection prevalence with Borrelia burgdorferi have emerged as promising ways to reduce the density of infected ticks. Acaricides of the isoxazoline family offer high potential for reducing infestation of ticks on small mammals as they have high efficacy at killing feeding ticks for a long period. Fluralaner baits were recently demonstrated as effective, in the laboratory, at killing Ixodes scapularis larvae infesting Peromyscus mice, the main reservoir for B. burgdorferi in northeastern North America. Here, effectiveness of this approach for reducing the infestation of small mammals by immature stages of I. scapularis was tested in a natural environment. Two densities of fluralaner baits (2.1 baits/1,000 m2 and 4.4 baits/1,000 m2) were used during three years in forest plots. The number of I. scapularis larvae and nymphs per mouse from treated and control plots were compared. Fluralaner baiting reduced the number of larvae per mouse by 68% (CI95: 51-79%) at 2.1 baits/1,000 m2 and by 86% (CI95: 77-92%) at 4.4 baits/1,000 m2. The number of nymphs per mouse was reduced by 72% (CI95: 22-90%) at 4.4 baits/1,000 m2 but was not significantly reduced at 2.1 baits/1,000 m2. Reduction of Peromyscus mouse infestation by immature stages of I. scapularis supports the hypothesis that an approach targeting reservoirs of B. burgdorferi with isoxazolines has the potential to reduce tick-borne disease risk by decreasing the density of infected ticks in the environment.
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Affiliation(s)
- Jérôme Pelletier
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Centre de recherche en santé publique de l'Université de Montréal et du CIUSSS du Centre-Sud-de-l'Île-de-Montréal, Montréal, Québec, Canada
| | - Jean-Philippe Rocheleau
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Département de santé animale, CÉGEP de Saint-Hyacinthe, Saint-Hyacinthe, Québec, Canada
| | - Cécile Aenishaenslin
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Centre de recherche en santé publique de l'Université de Montréal et du CIUSSS du Centre-Sud-de-l'Île-de-Montréal, Montréal, Québec, Canada
| | - Gabrielle Dimitri Masson
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
| | - L Robbin Lindsay
- One Health Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Nicholas H Ogden
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
| | - Catherine Bouchard
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
| | - Patrick A Leighton
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Centre de recherche en santé publique de l'Université de Montréal et du CIUSSS du Centre-Sud-de-l'Île-de-Montréal, Montréal, Québec, Canada
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6
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Hammond-Collins K, Tremblay M, Milord F, Baron G, Bouchard C, Kotchi SO, Lambert L, Leighton P, Ogden NH, Rees EE. An ecological approach to predict areas with established populations of Ixodes scapularis in Quebec, Canada. Ticks Tick Borne Dis 2022; 13:102040. [PMID: 36137391 DOI: 10.1016/j.ttbdis.2022.102040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 08/28/2022] [Accepted: 09/11/2022] [Indexed: 10/31/2022]
Abstract
Public health management of Lyme disease (LD) is a dynamic challenge in Canada. Climate warming is driving the northward expansion of suitable habitat for the tick vector, Ixodes scapularis. Information about tick population establishment is used to inform the risk of LD but is challenged by sampling biases from surveillance data. Misclassifying areas as having no established tick population underestimates the LD risk classification. We used a logistic regression model at the municipal level to predict the probability of I. scapularis population establishment based on passive tick surveillance data during the period of 2010-2017 in southern Quebec. We tested for the effect of abiotic and biotic factors hypothesized to influence tick biology and ecology. Additional variables controlled for sampling biases in the passive surveillance data. In our final selected model, tick population establishment was positively associated with annual cumulative degree-days > 0°C, precipitation and deer density, and negatively associated with coniferous and mixed forest types. Sampling biases from passive tick surveillance were controlled for using municipal population size and public health instructions on tick submissions. The model performed well as indicated by an area under the curve (AUC) of 0.92, sensitivity of 86% and specificity of 81%. Our model enables prediction of I. scapularis population establishment in areas which lack data from passive tick surveillance and may improve the sensitivity of LD risk categorization in these areas. A more sensitive system of LD risk classification is important for increasing awareness and use of protective measures employed against ticks, and decreasing the morbidity associated with LD.
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Affiliation(s)
| | - Mathieu Tremblay
- Direction de santé publique de la Montérégie, 1255 rue Beauregard, Longueuil, QC, Canada
| | - François Milord
- Direction de santé publique de la Montérégie, 1255 rue Beauregard, Longueuil, QC, Canada; Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, QC, Canada
| | - Geneviève Baron
- Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, QC, Canada; Direction de Santé Publique de l'Estrie, 300 rue King Est, Bureau 300, Sherbrooke, QC, Canada
| | - Catherine Bouchard
- Public Health Agency of Canada, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada; Faculty of Veterinary Medicine, Université de Montréal, 3190 rue Sicotte, Saint-Hyacinthe, QC, Canada; Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique (GREZOSP), Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada
| | - Serge Olivier Kotchi
- Public Health Agency of Canada, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada; Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique (GREZOSP), Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada
| | - Louise Lambert
- Direction de santé publique de la Montérégie, 1255 rue Beauregard, Longueuil, QC, Canada
| | - Patrick Leighton
- Faculty of Veterinary Medicine, Université de Montréal, 3190 rue Sicotte, Saint-Hyacinthe, QC, Canada; Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique (GREZOSP), Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada
| | - Nicholas H Ogden
- Public Health Agency of Canada, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada; Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique (GREZOSP), Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada
| | - Erin E Rees
- Public Health Agency of Canada, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada; Faculty of Veterinary Medicine, Université de Montréal, 3190 rue Sicotte, Saint-Hyacinthe, QC, Canada; Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique (GREZOSP), Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, QC, Canada
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7
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Clarke LL, Mead DG, Ruder MG, Howerth EW, Stallknecht D. North American Arboviruses and White-Tailed Deer ( Odocoileus virginianus): Associated Diseases and Role in Transmission. Vector Borne Zoonotic Dis 2022; 22:425-442. [PMID: 35867036 DOI: 10.1089/vbz.2022.0005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background: Arboviral disease is of increasing concern to human and animal health professionals as emerging and re-emerging arboviruses are more frequently recognized. Wildlife species are known to play a role in the transmission and maintenance of arboviruses and infections can result in morbidity and mortality in wildlife hosts. Materials and Methods: In this review, we detail existing evidence of white-tailed deer (Odocoileus virginianus) as an important host to a diverse collection of arboviruses and evaluate the utility of this species as a resource to better understand the epidemiology of related viral diseases. Results: Relevant veterinary and zoonotic viral pathogens endemic to North America include epizootic hemorrhagic disease virus, bluetongue virus, orthobunyaviruses, vesicular stomatitis virus, Eastern equine encephalitis virus, West Nile virus, and Powassan virus. Exotic viral pathogens that may infect white-tailed deer are also identified with an emphasis on zoonotic disease risks. The utility of this species is attributed to the high degree of contact with humans and domestic livestock and evidence of preferential feeding by various insect vectors. Conclusions: There is mounting evidence that white-tailed deer are a useful, widely available source of information regarding arboviral circulation, and that surveillance and monitoring of deer populations would be of value to the understanding of certain viral transmission dynamics, with implications for improving human and domestic animal health.
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Affiliation(s)
- Lorelei L Clarke
- Wisconsin Veterinary Diagnostic Laboratory, Madison, Wisconsin, USA
| | - Daniel G Mead
- Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Mark G Ruder
- Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Elizabeth W Howerth
- Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - David Stallknecht
- Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
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8
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Egan SL, Taylor CL, Banks PB, Northover AS, Ahlstrom LA, Ryan UM, Irwin PJ, Oskam CL. The bacterial biome of ticks and their wildlife hosts at the urban-wildland interface. Microb Genom 2021; 7. [PMID: 34913864 PMCID: PMC8767321 DOI: 10.1099/mgen.0.000730] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Advances in sequencing technologies have revealed the complex and diverse microbial communities present in ticks (Ixodida). As obligate blood-feeding arthropods, ticks are responsible for a number of infectious diseases that can affect humans, livestock, domestic animals and wildlife. While cases of human tick-borne diseases continue to increase in the northern hemisphere, there has been relatively little recognition of zoonotic tick-borne pathogens in Australia. Over the past 5 years, studies using high-throughput sequencing technologies have shown that Australian ticks harbour unique and diverse bacterial communities. In the present study, free-ranging wildlife (n=203), representing ten mammal species, were sampled from urban and peri-urban areas in New South Wales (NSW), Queensland (QLD) and Western Australia (WA). Bacterial metabarcoding targeting the 16S rRNA locus was used to characterize the microbiomes of three sample types collected from wildlife: blood, ticks and tissue samples. Further sequence information was obtained for selected taxa of interest. Six tick species were identified from wildlife: Amblyomma triguttatum, Ixodes antechini, Ixodes australiensis, Ixodes holocyclus, Ixodes tasmani and Ixodes trichosuri. Bacterial 16S rRNA metabarcoding was performed on 536 samples and 65 controls, generating over 100 million sequences. Alpha diversity was significantly different between the three sample types, with tissue samples displaying the highest alpha diversity (P<0.001). Proteobacteria was the most abundant taxon identified across all sample types (37.3 %). Beta diversity analysis and ordination revealed little overlap between the three sample types (P<0.001). Taxa of interest included Anaplasmataceae, Bartonella, Borrelia, Coxiellaceae, Francisella, Midichloria, Mycoplasma and Rickettsia. Anaplasmataceae bacteria were detected in 17.7% (95/536) of samples and included Anaplasma, Ehrlichia and Neoehrlichia species. In samples from NSW, 'Ca. Neoehrlichia australis', 'Ca. Neoehrlichia arcana', Neoehrlichia sp. and Ehrlichia sp. were identified. A putative novel Ehrlichia sp. was identified from WA and Anaplasma platys was identified from QLD. Nine rodent tissue samples were positive for a novel Borrelia sp. that formed a phylogenetically distinct clade separate from the Lyme Borrelia and relapsing fever groups. This novel clade included recently identified rodent-associated Borrelia genotypes, which were described from Spain and North America. Bartonella was identified in 12.9% (69/536) of samples. Over half of these positive samples were obtained from black rats (Rattus rattus), and the dominant bacterial species identified were Bartonella coopersplainsensis and Bartonella queenslandensis. The results from the present study show the value of using unbiased high-throughput sequencing applied to samples collected from wildlife. In addition to understanding the sylvatic cycle of known vector-associated pathogens, surveillance work is important to ensure preparedness for potential zoonotic spillover events.
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Affiliation(s)
- Siobhon L Egan
- Harry Butler Institute, Murdoch University, Murdoch, Western Australia, 6150, Australia
| | - Casey L Taylor
- School of Life and Environmental Sciences, The University of Sydney, Camperdown, New South Wales, 2006, Australia
| | - Peter B Banks
- School of Life and Environmental Sciences, The University of Sydney, Camperdown, New South Wales, 2006, Australia
| | - Amy S Northover
- School of Veterinary Medicine, Murdoch University, Murdoch, Western Australia, 6150, Australia
| | - Liisa A Ahlstrom
- Elanco Animal Health, Macquarie Park, New South Wales, 2113, Australia
| | - Una M Ryan
- Harry Butler Institute, Murdoch University, Murdoch, Western Australia, 6150, Australia
| | - Peter J Irwin
- Harry Butler Institute, Murdoch University, Murdoch, Western Australia, 6150, Australia.,School of Veterinary Medicine, Murdoch University, Murdoch, Western Australia, 6150, Australia
| | - Charlotte L Oskam
- Harry Butler Institute, Murdoch University, Murdoch, Western Australia, 6150, Australia
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9
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Tiffin HS, Skvarla MJ, Machtinger ET. Tick abundance and life-stage segregation on the American black bear ( Ursus americanus). Int J Parasitol Parasites Wildl 2021; 16:208-216. [PMID: 34703760 PMCID: PMC8523825 DOI: 10.1016/j.ijppaw.2021.10.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 10/08/2021] [Accepted: 10/08/2021] [Indexed: 01/22/2023]
Abstract
Tick abundance and diagnosed cases of tick-borne diseases have been increasing in the United States. American black bear (Ursus americanus) populations have also been increasing in the eastern United States. As a competent host of several species of ticks and a mammal capable of traveling long distances, the role of black bears as hosts for ticks requires further evaluation. Ectoparasite surveys were conducted on black bears in Pennsylvania to evaluate tick presence, abundance, spatial distribution, and association with Sarcoptes scabiei, the etiological agent of sarcoptic mange, on bears to better understand their role in tick ecology and to improve on-host surveillance techniques. Tick burden was evaluated using standard area sampling (10.16 × 10.16 cm squares) on pre-designated body regions on black bears from June 2018–December 2019. In total, 278 unique individual black bears were evaluated, with all ticks identified as Ixodes scapularis (n = 1976; 76.7% adults, 23.3% immatures). Tick presence differed by body region on bears, with the highest percentage of tick observations located on bear ears and muzzle. Ticks also partitioned on black bears by life-stage, with immature ticks primarily recorded on the lower extremities of bears and adult ticks primarily recorded on the front-quarters of bears. This includes the first known record of I. scapularis larvae parasitizing black bears, and observations of all three mobile life-stages concurrently parasitizing bears. Tick abundance was also statistically significant dependent on season, with the highest abundance of ticks recorded in spring and lowest abundance in fall. Adult ticks were less likely to be present on bears with mange. These data reveal the important role black bears may serve in tick ecology and dispersal as all three mobile life-stages of I. scapularis were found parasitizing a mammal capable of traveling far distances in a region with high numbers of Lyme disease cases. First record of Ixodes scapularis larvae parasitizing black bears. All three I. scapularis mobile life-stages concurrently parasitizing black bears. I. scapularis life-stage segregation on black bears. Standardized tick survey findings can be used to improve on-host surveillance. Bears with sarcoptic mange less likely to have adult ticks present.
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10
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Krzysiak MK, Anusz K, Konieczny A, Rola J, Salat J, Strakova P, Olech W, Larska M. The European bison (Bison bonasus) as an indicatory species for the circulation of tick-borne encephalitis virus (TBEV) in natural foci in Poland. Ticks Tick Borne Dis 2021; 12:101799. [PMID: 34358779 DOI: 10.1016/j.ttbdis.2021.101799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 07/05/2021] [Accepted: 07/05/2021] [Indexed: 12/16/2022]
Abstract
Tick-borne encephalitis (TBE) is one of the most common zoonotic diseases in Europe transmitted by Ixodidae vectors. While small mammals such as bank voles and ticks constitute the main reservoirs for virus transmission, large sylvatic species act as a food source for ticks. Cervids such as roe deer and red deer are considered sentinel species for TBE in natural foci. In addition, an increase of the population size and density of large wild mammals in an area corresponds to an increase in the tick burden and may potentially increase the prevalence of TBE virus (TBEV) in ticks and tick hosts and further exposure risk in humans. Humans are considered accidental hosts. The prevalence of TBE relies on interactions between host, vector and environment. The present study examines the exposure of the largest European herbivore, the European bison (Bison bonasus) to TBEV infection. Assessed using the IMMUNOZYM FSME ELISA (PROGEN), the overall TBEV seroprevalence was 62.7% in the 335 European bison that were studied. ELISA results were confirmed by the gold-standard virus neutralization test (VNT) with 98.7% sensitivity and thus giving a true prevalence of 63.5%. TBEV seroprevalence was significantly correlated to the origin, age group, sex, population type (free living/captive) and sanitary status (healthy/selectively eliminated/found dead/killed in accident) of the European bison in the univariable analysis. The highest seroprevalences were observed in the three largest north-eastern wild populations (Białowieska, Borecka and Knyszyńska forests), which corresponded with the highest incidence of human cases reported in the country. The risk of TBEV seropositivity increased with age and was higher in female and free-ranging European bison. Additionally, to the epidemiological investigation, the continuous detection of TBEV antibodies was studied by repetitive testing of animals over the course of 34 months. Two of six seropositive animals remained seropositive throughout the study. The presence of antibodies was followed throughout the study in seropositive European bison and for at least a year in animals that seroconverted during the observation period.
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Affiliation(s)
- Michał K Krzysiak
- Białowieża National Park, Park Pałacowy 11, 17-230, Białowieża, Poland; Faculty of Civil Engineering and Environmental Sciences, Institute of Forest Sciences, Białystok University of Technology, Wiejska 45 E, 15-351, Białystok, Poland.
| | - Krzysztof Anusz
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University Of Life Sciences (WULS), ul. Nowoursynowska 166, Warszawa 02-786, Poland
| | - Andrzej Konieczny
- Faculty of Agrobioengineering, University of Live Sciences, ul. Akademicka 13, Lublin 20-950, Poland
| | - Jerzy Rola
- Department of Virology, National Veterinary Research Institute, AL. Partyzantów 57, Pulawy 24-100, Poland
| | - Jiri Salat
- Veterinary Research Institute, Hudcova 296/70, Brno 621 00, Czech Republic; Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branisovska 31, Ceské Budejovice 37005, Czech Republic
| | - Petra Strakova
- Veterinary Research Institute, Hudcova 296/70, Brno 621 00, Czech Republic; Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branisovska 31, Ceské Budejovice 37005, Czech Republic
| | - Wanda Olech
- Institute of Animal Sciences, Warsaw University of Life Science (WULS), ul. Ciszewskiego 8, Warszawa 02-786, Poland
| | - Magdalena Larska
- Department of Virology, National Veterinary Research Institute, AL. Partyzantów 57, Pulawy 24-100, Poland
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11
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Eisen RJ, Paddock CD. Tick and Tickborne Pathogen Surveillance as a Public Health Tool in the United States. JOURNAL OF MEDICAL ENTOMOLOGY 2021; 58:1490-1502. [PMID: 32440679 PMCID: PMC8905548 DOI: 10.1093/jme/tjaa087] [Citation(s) in RCA: 105] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Indexed: 05/03/2023]
Abstract
In recent decades, tickborne disease (TBD) cases and established populations of medically important ticks have been reported over expanding geographic areas, and an increasing number of tickborne bacteria, viruses, and protozoans have been recognized as human pathogens, collectively contributing to an increasing burden of TBDs in the United States. The prevention and diagnosis of TBDs depend greatly on an accurate understanding by the public and healthcare providers of when and where persons are at risk for exposure to human-biting ticks and to the pathogens these ticks transmit. However, national maps showing the distributions of medically important ticks and the presence or prevalence of tickborne pathogens are often incomplete, outdated, or lacking entirely. Similar deficiencies exist regarding geographic variability in host-seeking tick abundance. Efforts to accurately depict acarological risk are hampered by lack of systematic and routine surveillance for medically important ticks and their associated human pathogens. In this review, we: 1) outline the public health importance of tick surveillance; 2) identify gaps in knowledge regarding the distributions and abundance of medically important ticks in the United States and the presence and prevalence of their associated pathogens; 3) describe key objectives for tick surveillance and review methods appropriate for addressing those goals; and 4) assess current capacity and barriers to implementation and sustainability of tick surveillance programs.
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Affiliation(s)
- Rebecca J. Eisen
- Bacterial Diseases Branch, Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Christopher D. Paddock
- Rickettsial Zoonoses Branch, Division of Vector-Borne Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA
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12
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Moll RJ, McRoberts JT, Millspaugh JJ, Wiskirchen KH, Sumners JA, Isabelle JL, Keller BJ, Montgomery RA. A rare 300 kilometer dispersal by an adult male white-tailed deer. Ecol Evol 2021; 11:3685-3695. [PMID: 33976768 PMCID: PMC8093661 DOI: 10.1002/ece3.7354] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 01/31/2021] [Accepted: 02/04/2021] [Indexed: 11/26/2022] Open
Abstract
Despite the key roles that dispersal plays in individual animal fitness and meta-population gene flow, it remains one of the least understood behaviors in many species. In large mammalian herbivores, dispersals might span long distances and thereby influence landscape-level ecological processes, such as infectious disease spread. Here, we describe and analyze an exceptional long-distance dispersal by an adult white-tailed deer (Odocoileus virginianus) in the central United States. We also conducted a literature survey to compare the dispersal to previous studies. This dispersal was remarkable for its length, duration, and the life history stage of the dispersing individual. Dispersal is typical of juvenile deer seeking to establish postnatal home ranges, but this dispersal was undertaken by an adult male (age = 3.5). This individual dispersed ~300 km over a 22-day period by moving, on average, 13.6 km/day and achieving a straight-line distance of ~215 km, which was ~174 km longer than any other distance recorded for an adult male deer in our literature survey. During the dispersal, which occurred during the hunting season, the individual crossed a major river seven times, an interstate highway, a railroad, and eight state highways. Movements during the dispersal were faster (mean = 568.1 m/h) and more directional than those during stationary home range periods before and after the dispersal (mean = 56.9 m/h). Likewise, movements during the dispersal were faster (mean = 847.8 m/h) and more directional at night than during the day (mean = 166.4 m/h), when the individual frequently sheltered in forest cover. This natural history event highlights the unpredictable nature of dispersal and has important implications for landscape-level processes such as chronic wasting disease transmission in cervids. More broadly, our study underscores how integrating natural history observations with modern technology holds promise for understanding potentially high impact but rarely recorded ecological events.
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Affiliation(s)
- Remington J. Moll
- Department of Natural Resources and the EnvironmentUniversity of New HampshireDurhamNHUSA
| | - Jon T. McRoberts
- Wildlife Biology Program, W.A. Franke College of Forestry and ConservationUniversity of MontanaMissoulaMTUSA
| | - Joshua J. Millspaugh
- Wildlife Biology Program, W.A. Franke College of Forestry and ConservationUniversity of MontanaMissoulaMTUSA
| | | | | | | | - Barbara J. Keller
- Missouri Department of ConservationScience BranchColumbiaMOUSA
- Minnesota Department of Natural ResourcesSt. PaulMNUSA
| | - Robert A. Montgomery
- Research on the Ecology of Carnivores and their Prey (RECaP) LaboratoryDepartment of Fisheries and WildlifeMichigan State UniversityEast LansingMIUSA
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13
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Poh KC, Skvarla M, Evans JR, Machtinger ET. Collecting Deer Keds (Diptera: Hippoboscidae: Lipoptena Nitzsch, 1818 and Neolipoptena Bequaert, 1942) and Ticks (Acari: Ixodidae) From Hunter-Harvested Deer and Other Cervids. JOURNAL OF INSECT SCIENCE (ONLINE) 2020; 20:5948068. [PMID: 33135746 PMCID: PMC7604836 DOI: 10.1093/jisesa/ieaa024] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Indexed: 05/29/2023]
Abstract
Deer keds (Diptera: Hippoboscidae: Lipoptena Nitzsch, 1818 and Neolipoptena Bequaert, 1942) are blood-feeding ectoparasites that primarily attack cervids and occasionally bite humans, while ticks may be found on cervids, but are more generalized in host choice. Recent detection of pathogens such as Anaplasma and Borrelia in deer keds and historical infections of tick-borne diseases provides reason to investigate these ectoparasites as vectors. However, previous methods employed to sample deer keds and ticks vary, making it difficult to standardize and compare ectoparasite burdens on cervids. Therefore, we propose a standardized protocol to collect deer keds and ticks from hunter-harvested deer, which combines previous methods of sampling, including timing of collections, dividing sections of the deer, and materials used in the collection process. We tested a three-section and a five-section sampling scheme in 2018 and 2019, respectively, and found that dividing the deer body into five sections provided more specificity in identifying where deer keds and ticks may be found on deer. Data from 2018 suggested that deer keds and ticks were found on all three sections (head, anterior, posterior), while data from 2019 suggested that more Ixodes scapularis were found on the head and deer keds were found on all body sections (head, dorsal anterior, dorsal posterior, ventral anterior, and ventral posterior). The protocol provides an efficient way to sample deer for deer keds and ticks and allows researchers to compare ectoparasite burdens across geographical regions. Furthermore, this protocol can be used to collect other ectoparasites from deer or other cervids.
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Affiliation(s)
- Karen C Poh
- Department of Entomology, Penn State University, University Park, PA
| | - Michael Skvarla
- Department of Entomology, Penn State University, University Park, PA
| | - Jesse R Evans
- Department of Entomology, Penn State University, University Park, PA
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14
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Ogden NH, Bouchard C, Badcock J, Drebot MA, Elias SP, Hatchette TF, Koffi JK, Leighton PA, Lindsay LR, Lubelczyk CB, Peregrine AS, Smith RP, Webster D. What is the real number of Lyme disease cases in Canada? BMC Public Health 2019; 19:849. [PMID: 31253135 PMCID: PMC6599318 DOI: 10.1186/s12889-019-7219-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 06/20/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Lyme disease is emerging in Canada due to expansion of the range of the tick vector Ixodes scapularis from the United States. National surveillance for human Lyme disease cases began in Canada in 2009. Reported numbers of cases increased from 144 cases in 2009 to 2025 in 2017. It has been claimed that few (< 10%) Lyme disease cases are reported associated with i) supposed under-diagnosis resulting from perceived inadequacies of serological testing for Lyme disease, ii) expectation that incidence in Canadian provinces and neighbouring US states should be similar, and iii) analysis of serological responses of dogs to the agent of Lyme disease, Borrelia burgdorferi. We argue that performance of serological testing for Lyme disease is well studied, and variations in test performance at different disease stages are accounted for in clinical diagnosis of Lyme disease, and in surveillance case definitions. Extensive surveillance for tick vectors has taken place in Canada providing a clear picture of the emergence of risk in the Canadian environment. This surveillance shows that the geographic scope of I. scapularis populations and Lyme disease risk is limited but increasing in Canada. The reported incidence of Lyme disease in Canada is consistent with this pattern of environmental risk, and the differences in Lyme disease incidence between US states and neighbouring Canadian provinces are consistent with geographic differences in environmental risk. Data on serological responses in dogs from Canada and the US are consistent with known differences in environmental risk, and in numbers of reported Lyme disease cases, between the US and Canada. CONCLUSION The high level of consistency in data from human case and tick surveillance, and data on serological responses in dogs, suggests that a high degree of under-reporting in Canada is unlikely. We speculate that approximately one third of cases are reported in regions of emergence of Lyme disease, although prospective studies are needed to fully quantify under-reporting. In the meantime, surveillance continues to identify and track the ongoing emergence of Lyme disease, and the risk to the public, in Canada.
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Affiliation(s)
- N. H. Ogden
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, St. Hyacinthe, Canada
| | - C. Bouchard
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, St. Hyacinthe, Canada
| | - J. Badcock
- Office of the Chief Medical Officer of Health, New Brunswick Department of Health, Fredericton, Canada
| | - M. A. Drebot
- Zoonotic Diseases and Special Pathogens Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada
| | - S. P. Elias
- Maine Medical Center Research Institute, Scarborough, ME USA
| | - T. F. Hatchette
- Department of Pathology and Laboratory Medicine, Nova Scotia Health Authority and Dalhousie University, Halifax, NS Canada
| | - J. K. Koffi
- Policy Integration and Zoonoses Division, Centre for Food-Borne, Environmental and Zoonotic Diseases, Public Health Agency of Canada, Ottawa, Canada
| | - P. A. Leighton
- Département de pathologie et microbiologie, and Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire, Université de Montréal, Québec, Canada
| | - L. R. Lindsay
- Zoonotic Diseases and Special Pathogens Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada
| | - C. B. Lubelczyk
- Maine Medical Center Research Institute, Scarborough, ME USA
| | - A. S. Peregrine
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Canada
| | - R. P. Smith
- Maine Medical Center Research Institute, Scarborough, ME USA
| | - D. Webster
- Department of Medicine, Division of Infectious Diseases, Faculty of Medicine, Saint John Regional Hospital, Dalhousie University, Saint John, New Brunswick Canada
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15
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Clow KM, Leighton PA, Pearl DL, Jardine CM. A framework for adaptive surveillance of emerging tick-borne zoonoses. One Health 2019; 7:100083. [PMID: 30809583 PMCID: PMC6376153 DOI: 10.1016/j.onehlt.2019.100083] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 02/07/2019] [Accepted: 02/09/2019] [Indexed: 12/19/2022] Open
Abstract
Significant global ecological changes continue to drive emergence of tick-borne zoonoses around the world. This poses an important threat to both human and animal health, and highlights the need for surveillance systems that are capable of monitoring these complex diseases effectively across different stages of the emergence process. Our objective was to develop an evidence-based framework for surveillance of emerging tick-borne zoonoses. We conducted a realist review to understand the available approaches and major challenges associated with surveillance of emerging tick-borne zoonoses. Lyme disease, with a specific focus on emergence in Canada, was used as a case study to provide real-world context, since the process of disease emergence is ongoing in this country. We synthesize the results to propose a novel framework for adaptive surveillance of emerging tick-borne zoonoses. Goals for each phase of disease emergence are highlighted and approaches are suggested. The framework emphasizes the needs for surveillance systems to be inclusive, standardized, comprehensive and sustainable. We build upon a growing body of infectious disease literature that is advocating for reform to surveillance systems. Although our framework has been developed for tick-borne zoonoses, it is flexible and has the potential to be applied to a variety of other vector-borne and zoonotic diseases.
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Affiliation(s)
- Katie M. Clow
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
| | - Patrick A. Leighton
- Department of Pathology and Microbiology, Faculty of Veterinary Medicine, University of Montréal, 3200 Rue Sicotte, Saint-Hyacinthe, Quebec J2S 2M2, Canada
| | - David L. Pearl
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
| | - Claire M. Jardine
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
- Canadian Wildlife Health Cooperative, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
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16
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Robertson DL, Babin LM, Krall JR, von Fricken ME, Baghi H, Jacobsen KH. The Association Between Hunter-Killed Deer and Lyme Disease in New Jersey, 2000-2014. ECOHEALTH 2019; 16:330-337. [PMID: 30825021 DOI: 10.1007/s10393-019-01401-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 01/17/2019] [Accepted: 01/24/2019] [Indexed: 06/09/2023]
Abstract
Years when the deer population is robust during the autumn hunting season may point toward an elevated risk of Lyme disease (LD) in the human population two summers later. We applied overdispersed Poisson regression models to county-specific data from New Jersey for each year from 2000 to 2014. The average relative risk of LD for each additional hunter-killed deer per square mile was 1.12 (1.10, 1.14) for 2000-2007 and 1.11 (1.09, 1.13) for 2008-2014. The hunting data already collected for conservation and wildlife management purposes may be a relevant component of LD surveillance activities.
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Affiliation(s)
- Daniel L Robertson
- Department of Global and Community Health, George Mason University, 4400 University Drive 5B7, Fairfax, VA, 22030, USA
| | - Leah M Babin
- Department of Global and Community Health, George Mason University, 4400 University Drive 5B7, Fairfax, VA, 22030, USA
| | - Jenna R Krall
- Department of Global and Community Health, George Mason University, 4400 University Drive 5B7, Fairfax, VA, 22030, USA
| | - Michael E von Fricken
- Department of Global and Community Health, George Mason University, 4400 University Drive 5B7, Fairfax, VA, 22030, USA
| | - Heibatollah Baghi
- Department of Global and Community Health, George Mason University, 4400 University Drive 5B7, Fairfax, VA, 22030, USA
| | - Kathryn H Jacobsen
- Department of Global and Community Health, George Mason University, 4400 University Drive 5B7, Fairfax, VA, 22030, USA.
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17
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Pak D, Jacobs SB, Sakamoto JM. A 117-year retrospective analysis of Pennsylvania tick community dynamics. Parasit Vectors 2019; 12:189. [PMID: 31036065 PMCID: PMC6489237 DOI: 10.1186/s13071-019-3451-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 04/20/2019] [Indexed: 11/29/2022] Open
Abstract
Background Tick-borne diseases have been increasing at the local, national, and global levels. Researchers studying ticks and tick-borne diseases need a thorough knowledge of the pathogens, vectors, and epidemiology of disease spread. Both active and passive surveillance approaches are typically used to estimate tick population size and risk of tick encounter. Our data consists of a composite of active and long-term passive surveillance, which has provided insight into spatial variability and temporal dynamics of ectoparasite communities and identified rarer tick species. We present a retrospective analysis on compiled data of ticks from Pennsylvania over the last 117 years. Methods We compiled data from ticks collected during tick surveillance research, and from citizen-based submissions. The majority of the specimens were submitted by citizens. However, a subset of the data was collected through active methods (flagging or dragging, or removal of ticks from wildlife). We analyzed all data from 1900–2017 for tick community composition, host associations, and spatio-temporal dynamics. Results In total there were 4491 submission lots consisting of 7132 tick specimens. Twenty-four different species were identified, with the large proportion of submissions represented by five tick species. We observed a shift in tick community composition in which the dominant species of tick (Ixodes cookei) was overtaken in abundance by Dermacentor variabilis in the early 1990s and then replaced in abundance by I. scapularis. We analyzed host data and identified overlaps in host range amongst tick species. Conclusions We highlight the importance of long-term passive tick surveillance in investigating the ecology of both common and rare tick species. Information on the geographical distribution, host-association, and seasonality of the tick community can help researchers and health-officials to identify high-risk areas. Electronic supplementary material The online version of this article (10.1186/s13071-019-3451-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Damie Pak
- Department of Biology, Pennsylvania State University, W-234A, Millennium Science Complex, University Park, PA, 16802, USA
| | - Steven B Jacobs
- Department of Entomology, Pennsylvania State University, 501 ASI Building, University Park, PA, 16802, USA
| | - Joyce M Sakamoto
- Department of Entomology, Pennsylvania State University, W-104 Millennium Science Complex, University Park, PA, 16802, USA.
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18
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Bouchard C, Dibernardo A, Koffi J, Wood H, Leighton PA, Lindsay LR. N Increased risk of tick-borne diseases with climate and environmental changes. CANADA COMMUNICABLE DISEASE REPORT = RELEVE DES MALADIES TRANSMISSIBLES AU CANADA 2019; 45:83-89. [PMID: 31285697 DOI: 10.14745/ccdr.v45i04a02f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Climate warming and other environmental changes have contributed to the expansion of the range of several tick species into higher latitudes in North America. As temperatures increase in Canada, the environment becomes more suitable for ticks and the season suitable for tick activity lengthens, so tick-borne diseases are likely to become more common in Canada. In addition to Lyme disease, four other tick-borne diseases (TBDs) have started to emerge and are likely to increase: Anaplasmosis; Babesiosis; Powassan virus; and Borrelia miyamotoi disease. Increased temperature increases the survival and activity period of ticks, increases the range of both reservoir and tick hosts (e.g. mice and deer) and increases the duration of the season when people may be exposed to ticks. Other ticks and TBDs may spread into Canada as the climate changes. The public health strategies to mitigate the impact of all TBDs include surveillance to detect current and emerging TBDs, and public health actions to prevent infections by modifying environmental and social-behavioral risk factors through increasing public awareness. Clinical care strategies include patient education, early detection, laboratory testing, and treatment.
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Affiliation(s)
- C Bouchard
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, St. Hyacinthe, QC
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, St. Hyacinthe, QC
| | - A Dibernardo
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB
| | - J Koffi
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, St. Hyacinthe, QC
- Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, St. Hyacinthe, QC
| | - H Wood
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB
| | - P A Leighton
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, St. Hyacinthe, QC
| | - L R Lindsay
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB
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19
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N Increased risk of tick-borne diseases with climate and environmental changes. ACTA ACUST UNITED AC 2019; 45:83-89. [PMID: 31285697 DOI: 10.14745/ccdr.v45i04a02] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Climate warming and other environmental changes have contributed to the expansion of the range of several tick species into higher latitudes in North America. As temperatures increase in Canada, the environment becomes more suitable for ticks and the season suitable for tick activity lengthens, so tick-borne diseases are likely to become more common in Canada. In addition to Lyme disease, four other tick-borne diseases (TBDs) have started to emerge and are likely to increase: Anaplasmosis; Babesiosis; Powassan virus; and Borrelia miyamotoi disease. Increased temperature increases the survival and activity period of ticks, increases the range of both reservoir and tick hosts (e.g. mice and deer) and increases the duration of the season when people may be exposed to ticks. Other ticks and TBDs may spread into Canada as the climate changes. The public health strategies to mitigate the impact of all TBDs include surveillance to detect current and emerging TBDs, and public health actions to prevent infections by modifying environmental and social-behavioral risk factors through increasing public awareness. Clinical care strategies include patient education, early detection, laboratory testing, and treatment.
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Nelder MP, Russell CB, Clow KM, Johnson S, Weese JS, Cronin K, Ralevski F, Jardine CM, Patel SN. Occurrence and distribution of Ambylomma americanum as determined by passive surveillance in Ontario, Canada (1999-2016). Ticks Tick Borne Dis 2018; 10:146-155. [PMID: 30337263 DOI: 10.1016/j.ttbdis.2018.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 10/03/2018] [Accepted: 10/06/2018] [Indexed: 01/18/2023]
Abstract
The lone star tick, Amblyomma americanum, is spreading northward from its historical stronghold in the southeastern United States. As a vector and biting pest, public and veterinary health officials must remain vigilant of the lone star tick's expanding range. We use ticks submitted to Public Health Ontario Laboratory (1999-2016) to describe the spatial and temporal dynamics of A. americanum in Ontario, Canada, as well as submitter demographics. We identified 847 A. americanum submissions during the surveillance period, with 773 (91.3%) non-travel-related and 74 (8.7%) travel-related submissions. Annual A. americanum submissions increased over the surveillance period. Approximately 91% of non-travel-related submissions were adult ticks and 9% were nymphs. The highest submission rates were from individuals living in the Eastern and South West regions of the province. Adult specimens were primarily submitted from May through July and nymphs from March through September. Higher numbers of submissions were from young children (<10 years) and older adults (55-74 years), with equal proportions of male and female submitters. The majority of travel-related submissions were from travellers returning from the southeastern United States (i.e., Florida, North Carolina, South Carolina, Tennessee, Texas). Amblyomma americanum distribution is scattered in Ontario and submissions are likely the consequence of ongoing detection of adventive specimens. Further tick dragging is required to confirm the presence of established lone star tick populations in the province. Given the relatively rapid expansion of blacklegged ticks, Ixodes scapularis, populations in Ontario, we expect climate change to facilitate the range of expansion of A. americanum into the province. We propose an algorithm for identifying A. americanum-risk areas, which will aid public and veterinary health officials when assessing the risks posed by lone star ticks.
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Affiliation(s)
- Mark P Nelder
- Enteric, Zoonotic and Vector-Borne Diseases, Communicable Diseases, Emergency Preparedness and Response, Public Health Ontario, 480 University Avenue, Toronto, Ontario, M5G 1V2, Canada.
| | - Curtis B Russell
- Enteric, Zoonotic and Vector-Borne Diseases, Communicable Diseases, Emergency Preparedness and Response, Public Health Ontario, 480 University Avenue, Toronto, Ontario, M5G 1V2, Canada
| | - Katie M Clow
- Ontario Veterinary College, University of Guelph, Guelph, 50 Stone Road East, Ontario, N1G 2W1, Canada
| | - Steven Johnson
- Informatics, Knowledge Services, Public Health Ontario, 480 University Avenue, Toronto, Ontario, M5G 1V2, Canada
| | - J Scott Weese
- Ontario Veterinary College, University of Guelph, Guelph, 50 Stone Road East, Ontario, N1G 2W1, Canada
| | - Kirby Cronin
- Laboratory Surveillance and Data Management, Public Health Ontario Laboratories, Public Health Ontario, 661 University Avenue, Toronto, Ontario, M5G 1M1, Canada; National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, Manitoba, R3E 3P6, Canada
| | - Filip Ralevski
- Parasitology, Public Health Ontario Laboratories, Public Health Ontario, 661 University Avenue, Toronto, Ontario, M5G 1M1, Canada
| | - Claire M Jardine
- Ontario Veterinary College, University of Guelph, Guelph, 50 Stone Road East, Ontario, N1G 2W1, Canada
| | - Samir N Patel
- Public Health Ontario Laboratory - Toronto, Public Health Ontario, 661 University Avenue, Toronto, Ontario, M5G 1M1, Canada; Department of Laboratory Medicine and Pathobiology, University of Toronto, 27 King's College Circle, Toronto, Ontario, M5S 1A1, Canada
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Trost CN, Lindsay LR, Dibernardo A, Chilton NB. Three genetically distinct clades of Anaplasma phagocytophilum in Ixodes scapularis. Ticks Tick Borne Dis 2018; 9:1518-1527. [DOI: 10.1016/j.ttbdis.2018.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 07/02/2018] [Accepted: 07/02/2018] [Indexed: 10/28/2022]
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Sakamoto JM. Progress, challenges, and the role of public engagement to improve tick-borne disease literacy. CURRENT OPINION IN INSECT SCIENCE 2018; 28:81-89. [PMID: 30551772 DOI: 10.1016/j.cois.2018.05.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/20/2018] [Accepted: 05/21/2018] [Indexed: 06/09/2023]
Abstract
Vector-borne diseases have increased worldwide, facilitated by globalization and variations in climate. Tick and tick-borne disease researchers, veterinarians, medical practitioners, and public health specialists are working to share their expertise on tick ecology, disease transmission, diagnostics, and treatment in order to control tick-borne epidemics and potential pandemics. This review will be a brief overview of the current status of tick-borne diseases, challenges on the scientific and public fronts, and the role of public engagement in improving citizen education within the context of ticks and tick-borne disease research.
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Affiliation(s)
- Joyce M Sakamoto
- Department of Entomology, The Pennsylvania State University, University Park, PA 16802 United States; Center for Infectious Disease Dynamics, The Pennsylvania State University, University Park, PA 16802 United States.
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Toepp AJ, Willardson K, Larson M, Scott BD, Johannes A, Senesac R, Petersen CA. Frequent Exposure to Many Hunting Dogs Significantly Increases Tick Exposure. Vector Borne Zoonotic Dis 2018; 18:519-523. [PMID: 30016206 DOI: 10.1089/vbz.2017.2238] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Certain professionals have more exposure to animals and therefore an increased risk of zoonoses. Professional hunting dog caretakers work with upwards of 50 dogs and are exposed to zoonoses through exposure to multiple potentially infectious canine secretions or excretions, as well as to the ticks that dogs carry. Dog caretakers reported having found embedded ticks on their bodies 5.83 times more than environment-only controls. Zoonotic Lyme disease, first in the United States for morbidity due to a vector-borne infection, has dramatically expanded its geographic range over the last two decades. This finding emphasizes the increased risk of tick-borne diseases, including Lyme disease, based on dog exposure and in areas of disease emergence.
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Affiliation(s)
- Angela J Toepp
- 1 Department of Epidemiology, University of Iowa College of Public Health , Iowa City, Iowa
| | - Kelsey Willardson
- 1 Department of Epidemiology, University of Iowa College of Public Health , Iowa City, Iowa
| | - Mandy Larson
- 1 Department of Epidemiology, University of Iowa College of Public Health , Iowa City, Iowa
| | - Benjamin D Scott
- 1 Department of Epidemiology, University of Iowa College of Public Health , Iowa City, Iowa
| | - Ashlee Johannes
- 2 Department of Occupational and Environmental Health, University of Iowa College of Public Health , Iowa City, Iowa
| | - Reid Senesac
- 1 Department of Epidemiology, University of Iowa College of Public Health , Iowa City, Iowa
| | - Christine A Petersen
- 1 Department of Epidemiology, University of Iowa College of Public Health , Iowa City, Iowa
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Mechai S, Margos G, Feil EJ, Lindsay LR, Michel P, Kotchi SO, Ogden NH. Evidence for an effect of landscape connectivity on Borrelia burgdorferi sensu stricto dispersion in a zone of range expansion. Ticks Tick Borne Dis 2018; 9:1407-1415. [PMID: 30006200 DOI: 10.1016/j.ttbdis.2018.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 06/22/2018] [Accepted: 07/01/2018] [Indexed: 12/29/2022]
Abstract
In North America, different strains of the Lyme disease-causing bacterium Borrelia burgdorferi sensu stricto cluster into phylogenetic groups that are associated with different levels of pathogenicity and, for some, specific rodent reservoir hosts. Here we explore whether landscape connectivity, by impacting host dispersal, influences B. burgdorferi s.s. spread patterns. This question is central to modelling spatial patterns of the spread of Lyme disease risk in the zone of northward range-expansion of B. burgdorferi s.s. in southeastern Canada where the study was conducted. We used multi-locus sequence typing (MLST) to characterise B. burgdorferi s.s. in positive ticks collected at 13 sites in southern Quebec, Canada during the early stages of B. burgdorferi s.s. invasion. We used mixed effects logistic regression to investigate whether landscape connectivity (probability of connectivity; PC) affected the probability that samples collected at different sites were of the same strain (MLST sequence type: ST). PC was calculated from a habitat map based on high spatial resolution (15 m) Landsat 8 imagery to identify woodland habitat that are preferred by rodent hosts of B. burgdorferi s.s. There was a significant positive association between the likelihood that two samples were of the same ST and PC, when PC values were grouped into three categories of low, medium and high. When analysing data for individual STs, samples at different sites were significantly more likely to be the same when PC was higher for the rodent-associated ST1. These findings support the hypothesis that dispersion trajectories of B. burgdorferi s.s. in general, and some rodent-associated strains in particular, are at least partly determined by landscape connectivity. This may suggest that dispersion of B. burgdorferi s.s. is more common by terrestrial mammal hosts (which would likely disperse according to landscape connectivity) than by birds, the dispersal of which is likely less constrained by landscape. This study suggests that accounting for landscape connectivity may improve model-based predictions of spatial spread patterns of B. burgdorferi s.s. The findings are consistent with possible past dispersal patterns of B. burgdorferi s.s. as determined by phylogeographic studies.
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Affiliation(s)
- Samir Mechai
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada; Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique, Faculté de médecine vétérinaire, Université de Montréal, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada.
| | - Gabriele Margos
- Ludwig Maximilians Universität München, Department for Infectious Diseases and Zoonoses, Munich, Germany; National Reference Centre for Borrelia, Oberschleissheim, Germany; Bavarian Health and Food Safety Authority, Oberschleissheim, Germany
| | - Edward J Feil
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, United Kingdom
| | - L Robbin Lindsay
- Zoonotic Diseases and Special Pathogens Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Pascal Michel
- Office of the Chief Science Officer, Public Health Agency of Canada, Ottawa, Ontario, K1A 0K9, Canada
| | - Serge Olivier Kotchi
- Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique, Faculté de médecine vétérinaire, Université de Montréal, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada; Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada
| | - Nick H Ogden
- Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique, Faculté de médecine vétérinaire, Université de Montréal, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada; Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada
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Stromdahl EY, Nadolny RM, Hickling GJ, Hamer SA, Ogden NH, Casal C, Heck GA, Gibbons JA, Cremeans TF, Pilgard MA. Amblyomma americanum (Acari: Ixodidae) Ticks Are Not Vectors of the Lyme Disease Agent, Borrelia burgdorferi (Spirocheatales: Spirochaetaceae): A Review of the Evidence. JOURNAL OF MEDICAL ENTOMOLOGY 2018; 55:501-514. [PMID: 29394366 PMCID: PMC6459681 DOI: 10.1093/jme/tjx250] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Indexed: 06/02/2023]
Abstract
In the early 1980s, Ixodes spp. ticks were implicated as the key North American vectors of Borrelia burgdorferi (Johnson, Schmid, Hyde, Steigerwalt and Brenner) (Spirocheatales: Spirochaetaceae), the etiological agent of Lyme disease. Concurrently, other human-biting tick species were investigated as potential B. burgdorferi vectors. Rashes thought to be erythema migrans were observed in patients bitten by Amblyomma americanum (L.) (Acari: Ixodidae) ticks, and spirochetes were visualized in a small percentage of A. americanum using fluorescent antibody staining methods, sparking interest in this species as a candidate vector of B. burgdorferi. Using molecular methods, the spirochetes were subsequently described as Borrelia lonestari sp. nov. (Spirocheatales: Spirochaetaceae), a transovarially transmitted relapsing fever Borrelia of uncertain clinical significance. In total, 54 surveys from more than 35 research groups, involving more than 52,000 ticks, have revealed a low prevalence of B. lonestari, and scarce B. burgdorferi, in A. americanum. In Lyme disease-endemic areas, A. americanum commonly feeds on B. burgdorferi-infected hosts; the extremely low prevalence of B. burgdorferi in this tick results from a saliva barrier to acquiring infection from infected hosts. At least nine transmission experiments involving B. burgdorferi in A. americanum have failed to demonstrate vector competency. Advancements in molecular analysis strongly suggest that initial reports of B. burgdorferi in A. americanum across many states were misidentified B. lonestari, or DNA contamination, yet the early reports continue to be cited without regard to the later clarifying studies. In this article, the surveillance and vector competency studies of B. burgdorferi in A. americanum are reviewed, and we conclude that A. americanum is not a vector of B. burgdorferi.
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Affiliation(s)
- Ellen Y. Stromdahl
- Army Public Health Center, Aberdeen Proving Ground, MD 21010-5403
- Corresponding author, ;
| | - Robyn M. Nadolny
- Army Public Health Center, Aberdeen Proving Ground, MD 21010-5403
| | - Graham J. Hickling
- Center for Wildlife Health, The University of Tennessee Institute of Agriculture, Knoxville, TN 37996
| | - Sarah A. Hamer
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843
| | - Nicholas H. Ogden
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Quebec, Canada J2S 2M2
| | - Cory Casal
- Army Public Health Center, Aberdeen Proving Ground, MD 21010-5403
| | - Garrett A. Heck
- Army Public Health Center, Aberdeen Proving Ground, MD 21010-5403
- Department of Cell and Molecular Biology, Colorado State University, Fort Collins, CO 80523
| | | | | | - Mark A. Pilgard
- Division of Vector-Borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO 80521
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26
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Bouchard C, Aenishaenslin C, Rees EE, Koffi JK, Pelcat Y, Ripoche M, Milord F, Lindsay LR, Ogden NH, Leighton PA. Integrated Social-Behavioral and Ecological Risk Maps to Prioritize Local Public Health Responses to Lyme Disease. ENVIRONMENTAL HEALTH PERSPECTIVES 2018; 126:047008. [PMID: 29671475 PMCID: PMC6071748 DOI: 10.1289/ehp1943] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 03/15/2018] [Accepted: 03/19/2018] [Indexed: 05/31/2023]
Abstract
BACKGROUND The risk of contracting Lyme disease (LD) can vary spatially because of spatial heterogeneity in risk factors such as social-behavior and exposure to ecological risk factors. Integrating these risk factors to inform decision-making should therefore increase the effectiveness of mitigation interventions. OBJECTIVES The objective of this study was to develop an integrated social-behavioral and ecological risk-mapping approach to identify priority areas for LD interventions. METHODS The study was conducted in the Montérégie region of Southern Quebec, Canada, where LD is a newly endemic disease. Spatial variation in LD knowledge, risk perceptions, and behaviors in the population were measured using web survey data collected in 2012. These data were used as a proxy for the social-behavioral component of risk. Tick vector population densities were measured in the environment during field surveillance from 2007 to 2012 to provide an index of the ecological component of risk. Social-behavioral and ecological components of risk were combined with human population density to create integrated risk maps. Map predictions were validated by testing the association between high-risk areas and the current spatial distribution of human LD cases. RESULTS Social-behavioral and ecological components of LD risk had markedly different distributions within the study region, suggesting that both factors should be considered for locally adapted interventions. The occurrence of human LD cases in a municipality was positively associated with tick density (p<0.01) but was not significantly associated with social-behavioral risk. CONCLUSION This study is an applied demonstration of how integrated social-behavioral and ecological risk maps can be created to assist decision-making. Social survey data are a valuable but underutilized source of information for understanding regional variation in LD exposure, and integrating this information into risk maps provides a novel approach for prioritizing and adapting interventions to the local characteristics of target populations. https://doi.org/10.1289/EHP1943.
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Affiliation(s)
- Catherine Bouchard
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
| | - Cécile Aenishaenslin
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada
| | - Erin E Rees
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
| | - Jules K Koffi
- Policy Integration and Zoonoses Division, Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
| | - Yann Pelcat
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
| | - Marion Ripoche
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
| | - François Milord
- Direction de santé publique de la Montérégie, Centre intégré de santé et de services sociaux Montérégie-Centre, Québec, Canada
| | - L Robbin Lindsay
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Nicholas H Ogden
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
| | - Patrick A Leighton
- Groupe de recherche en épidémiologie des zoonoses et santé publique (GREZOSP), Faculté de médecine vétérinaire (FMV), Université de Montréal, Saint-Hyacinthe, Québec, Canada
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A historical snapshot of Ixodes scapularis-borne pathogens in New Jersey ticks reflects a changing disease landscape. Ticks Tick Borne Dis 2018; 9:418-426. [DOI: 10.1016/j.ttbdis.2017.12.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 08/10/2017] [Accepted: 12/11/2017] [Indexed: 12/29/2022]
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Ebi KL, Ogden NH, Semenza JC, Woodward A. Detecting and Attributing Health Burdens to Climate Change. ENVIRONMENTAL HEALTH PERSPECTIVES 2017; 125:085004. [PMID: 28796635 PMCID: PMC5783629 DOI: 10.1289/ehp1509] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 03/31/2017] [Accepted: 04/17/2017] [Indexed: 05/03/2023]
Abstract
BACKGROUND Detection and attribution of health impacts caused by climate change uses formal methods to determine a) whether the occurrence of adverse health outcomes has changed, and b) the extent to which that change could be attributed to climate change. There have been limited efforts to undertake detection and attribution analyses in health. OBJECTIVE Our goal was to show a range of approaches for conducting detection and attribution analyses. RESULTS Case studies for heatwaves, Lyme disease in Canada, and Vibrio emergence in northern Europe highlight evidence that climate change is adversely affecting human health. Changes in rates and geographic distribution of adverse health outcomes were detected, and, in each instance, a proportion of the observed changes could, in our judgment, be attributed to changes in weather patterns associated with climate change. CONCLUSIONS The results of detection and attribution studies can inform evidence-based risk management to reduce current, and plan for future, changes in health risks associated with climate change. Gaining a better understanding of the size, timing, and distribution of the climate change burden of disease and injury requires reliable long-term data sets, more knowledge about the factors that confound and modify the effects of climate on health, and refinement of analytic techniques for detection and attribution. At the same time, significant advances are possible in the absence of complete data and statistical certainty: there is a place for well-informed judgments, based on understanding of underlying processes and matching of patterns of health, climate, and other determinants of human well-being. https://doi.org/10.1289/EHP1509.
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Affiliation(s)
- Kristie L Ebi
- Department of Global Health, University of Washington , Seattle, Washington, USA
| | - Nicholas H Ogden
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada , Saint-Hyacinthe, Quebec, Canada
| | - Jan C Semenza
- Stockholm Environmental Institute , Stockholm, Sweden
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Krakowetz CN, Dibernardo A, Lindsay LR, Chilton NB. Two Anaplasma phagocytophilum strains in Ixodes scapularis ticks, Canada. Emerg Infect Dis 2016; 20:2064-7. [PMID: 25417645 PMCID: PMC4257797 DOI: 10.3201/eid2012.140172] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We developed PCR-based assays to distinguish a human pathogenic strain of Anaplasma phagocytophilum, Ap-ha, from Ap-variant 1, a strain not associated with human infection. The assays were validated on A. phagocytophilum-infected black-legged ticks (Ixodes scapularis) collected in Canada. The relative prevalence of these 2 strains in I. scapularis ticks differed among geographic regions.
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30
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Nelder MP, Russell CB, Sheehan NJ, Sander B, Moore S, Li Y, Johnson S, Patel SN, Sider D. Human pathogens associated with the blacklegged tick Ixodes scapularis: a systematic review. Parasit Vectors 2016; 9:265. [PMID: 27151067 PMCID: PMC4857413 DOI: 10.1186/s13071-016-1529-y] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 04/21/2016] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND The blacklegged tick Ixodes scapularis transmits Borrelia burgdorferi (sensu stricto) in eastern North America; however, the agent of Lyme disease is not the sole pathogen harbored by the blacklegged tick. The blacklegged tick is expanding its range into areas of southern Canada such as Ontario, an area where exposure to blacklegged tick bites and tick-borne pathogens is increasing. We performed a systematic review to evaluate the public health risks posed by expanding blacklegged tick populations and their associated pathogens. METHODS We followed PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines for conducting our systematic review. We searched Ovid MEDLINE, Embase, BIOSIS, Scopus and Environment Complete databases for studies published from 2000 through 2015, using subject headings and keywords that included "Ixodes scapularis", "Rickettsia", "Borrelia", "Anaplasma", "Babesia" and "pathogen." Two reviewers screened titles and abstracts against eligibility criteria (i.e. studies that included field-collected blacklegged ticks and studies that did not focus solely on B. burgdorferi) and performed quality assessments on eligible studies. RESULTS Seventy-eight studies were included in the final review, 72 were from the US and eight were from Canada (two studies included blacklegged ticks from both countries). Sixty-four (82%) studies met ≥ 75% of the quality assessment criteria. Blacklegged ticks harbored 91 distinct taxa, 16 of these are tick-transmitted human pathogens, including species of Anaplasma, Babesia, Bartonella, Borrelia, Ehrlichia, Rickettsia, Theileria and Flavivirus. Organism richness was highest in the Northeast (Connecticut, New York) and Upper Midwest US (Wisconsin); however, organism richness was dependent on sampling effort. The primary tick-borne pathogens of public health concern in Ontario, due to the geographic proximity or historical detection in Ontario, are Anaplasma phagocytophilum, Babesia microti, B. burgdorferi, Borrelia miyamotoi, deer tick virus and Ehrlichia muris-like sp. Aside from B. burgdorferi and to a much lesser concern A. phagocytophilum, these pathogens are not immediate concerns to public health in Ontario; rather they represent future threats as the distribution of vectors and pathogens continue to proliferate. CONCLUSIONS Our review is the first systematic assessment of the literature on the human pathogens associated with the blacklegged tick. As Lyme disease awareness continues to increase, it is an opportune time to document the full spectrum of human pathogens transmittable by blacklegged ticks.
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Affiliation(s)
- Mark P Nelder
- Enteric, Zoonotic and Vector-borne Diseases; Communicable Diseases, Emergency Preparedness and Response; Public Health Ontario, Toronto, Ontario, Canada.
| | - Curtis B Russell
- Enteric, Zoonotic and Vector-borne Diseases; Communicable Diseases, Emergency Preparedness and Response; Public Health Ontario, Toronto, Ontario, Canada
| | - Nina Jain Sheehan
- Enteric, Zoonotic and Vector-borne Diseases; Communicable Diseases, Emergency Preparedness and Response; Public Health Ontario, Toronto, Ontario, Canada
| | - Beate Sander
- Enteric, Zoonotic and Vector-borne Diseases; Communicable Diseases, Emergency Preparedness and Response; Public Health Ontario, Toronto, Ontario, Canada
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, ON, Canada
- Institute for Clinical Evaluative Sciences, Toronto, ON, Canada
| | - Stephen Moore
- Enteric, Zoonotic and Vector-borne Diseases; Communicable Diseases, Emergency Preparedness and Response; Public Health Ontario, Toronto, Ontario, Canada
| | - Ye Li
- Analytic Services, Knowledge Services, Public Health Ontario, Toronto, ON, Canada
| | - Steven Johnson
- Analytic Services, Knowledge Services, Public Health Ontario, Toronto, ON, Canada
| | - Samir N Patel
- Public Health Ontario Laboratories, Public Health Ontario, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Doug Sider
- Enteric, Zoonotic and Vector-borne Diseases; Communicable Diseases, Emergency Preparedness and Response; Public Health Ontario, Toronto, Ontario, Canada
- Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada
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31
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Eisen RJ, Eisen L, Ogden NH, Beard CB. Linkages of Weather and Climate With Ixodes scapularis and Ixodes pacificus (Acari: Ixodidae), Enzootic Transmission of Borrelia burgdorferi, and Lyme Disease in North America. JOURNAL OF MEDICAL ENTOMOLOGY 2016; 53:250-61. [PMID: 26681789 PMCID: PMC4844560 DOI: 10.1093/jme/tjv199] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Lyme disease has increased both in incidence and geographic extent in the United States and Canada over the past two decades. One of the underlying causes is changes during the same time period in the distribution and abundance of the primary vectors: Ixodes scapularis Say and Ixodes pacificus Cooley and Kohls in eastern and western North America, respectively. Aside from short periods of time when they are feeding on hosts, these ticks exist in the environment where temperature and relative humidity directly affect their development, survival, and host-seeking behavior. Other important factors that strongly influence tick abundance as well as the proportion of ticks infected with the Lyme disease spirochete, Borrelia burgdorferi, include the abundance of hosts for the ticks and the capacity of tick hosts to serve as B. burgdorferi reservoirs. Here, we explore the linkages between climate variation and: 1) duration of the seasonal period and the timing of peak activity; 2) geographic tick distributions and local abundance; 3) enzootic B. burgdorferi transmission cycles; and 4) Lyme disease cases. We conclude that meteorological variables are most influential in determining host-seeking phenology and development, but, while remaining important cofactors, additional variables become critical when exploring geographic distribution and local abundance of ticks, enzootic transmission of B. burgdorferi, and Lyme disease case occurrence. Finally, we review climate change-driven projections for future impact on vector ticks and Lyme disease and discuss knowledge gaps and research needs.
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Affiliation(s)
- Rebecca J. Eisen
- Bacterial Diseases Branch, Division of Vectorborne Diseases, National Center for Emerging Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
- Corresponding author,
| | - Lars Eisen
- Bacterial Diseases Branch, Division of Vectorborne Diseases, National Center for Emerging Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Nicholas H. Ogden
- Zoonoses Division, Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Saint-Hyacinthe, Quebec, Canada
| | - Charles B. Beard
- Bacterial Diseases Branch, Division of Vectorborne Diseases, National Center for Emerging Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO
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Werden L, Lindsay LR, Barker IK, Bowman J, Gonzales EK, Jardine CM. Prevalence of Anaplasma phagocytophilum and Babesia microti in Ixodes scapularis from a Newly Established Lyme Disease Endemic Area, the Thousand Islands Region of Ontario, Canada. Vector Borne Zoonotic Dis 2015; 15:627-9. [PMID: 26393476 DOI: 10.1089/vbz.2015.1792] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Blacklegged ticks (Ixodes scapularis) are vectors for several important human diseases, including Lyme disease, human granulocytic anaplasmosis (HGA), and human babesiosis, caused by Borrelia burgdorferi, Anaplasma phagocytophilum, and Babesia microti, respectively. The continued northward range expansion of blacklegged ticks and associated pathogens is an increasing public health concern in Canada. The Thousand Islands region of eastern Ontario has recently been identified as a new endemic area for Lyme disease in Canada, but the occurrence of other pathogens in ticks in this area has not been fully described. Our objectives were to determine the prevalence of A. phagocytophilum and B. microti in small mammals and questing ticks in the Thousand Islands area and identify the strains of A. phagocytophilum circulating in ticks in the area. Serum and larval ticks were collected from trapped small mammals, and questing ticks were collected via drag sampling from up to 12 island and mainland sites in 2006, 2009, and 2010. A. phagocytophilum was identified by PCR in 3.4% (47/1388) ticks from eight of 12 sites; the prevalence ranged from 8.9% in 2006 to 3% in 2009. All 365 ticks tested for B. microti were negative. Antibodies to A. phagocytophilum were detected in 2.8% (17/611) of white-footed mice (Peromyscus leucopus) at two of 11 sites in 2006, 2009, or 2010. All 34 A. phagocytophilum-positive ticks submitted for strain identification using single-nucleotide polymorphism genotyping assays targeting the 16S rRNA gene were identified as a variant strain (Ap variant-1), which is not commonly associated with human disease. Our findings suggest that people are at low risk of contracting HGA or human babesiosis due to locally acquired tick bites in the Thousand Islands area. However, continued surveillance is warranted as these pathogens continue to expand their ranges in North America.
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Affiliation(s)
- Lisa Werden
- 1 Department of Pathobiology, Ontario Veterinary College, University of Guelph , Ontario, Canada .,2 Parks Canada Agency , Mallorytown, Ontario, Canada
| | | | - Ian K Barker
- 4 Canadian Wildlife Health Cooperative, Department of Pathobiology, Ontario Veterinary College, University of Guelph , Ontario, Canada
| | - Jeff Bowman
- 5 Ontario Ministry of Natural Resources and Forestry , Peterborough, Ontario, Canada
| | | | - Claire M Jardine
- 4 Canadian Wildlife Health Cooperative, Department of Pathobiology, Ontario Veterinary College, University of Guelph , Ontario, Canada
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33
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Major emerging vector-borne zoonotic diseases of public health importance in Canada. Emerg Microbes Infect 2015; 4:e33. [PMID: 26954882 PMCID: PMC4773043 DOI: 10.1038/emi.2015.33] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/22/2015] [Accepted: 05/06/2015] [Indexed: 12/25/2022]
Abstract
In Canada, the emergence of vector-borne diseases may occur via international movement and subsequent establishment of vectors and pathogens, or via northward spread from endemic areas in the USA. Re-emergence of endemic vector-borne diseases may occur due to climate-driven changes to their geographic range and ecology. Lyme disease, West Nile virus (WNV), and other vector-borne diseases were identified as priority emerging non-enteric zoonoses in Canada in a prioritization exercise conducted by public health stakeholders in 2013. We review and present the state of knowledge on the public health importance of these high priority emerging vector-borne diseases in Canada. Lyme disease is emerging in Canada due to range expansion of the tick vector, which also signals concern for the emergence of human granulocytic anaplasmosis, babesiosis, and Powassan virus. WNV has been established in Canada since 2001, with epidemics of varying intensity in following years linked to climatic drivers. Eastern equine encephalitis virus, Jamestown Canyon virus, snowshoe hare virus, and Cache Valley virus are other mosquito-borne viruses endemic to Canada with the potential for human health impact. Increased surveillance for emerging pathogens and vectors and coordinated efforts among sectors and jurisdictions will aid in early detection and timely public health response.
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34
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Ogden NH, Radojevic M, Wu X, Duvvuri VR, Leighton PA, Wu J. Estimated effects of projected climate change on the basic reproductive number of the Lyme disease vector Ixodes scapularis. ENVIRONMENTAL HEALTH PERSPECTIVES 2014; 122:631-8. [PMID: 24627295 PMCID: PMC4050516 DOI: 10.1289/ehp.1307799] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Accepted: 03/10/2014] [Indexed: 05/03/2023]
Abstract
BACKGROUND The extent to which climate change may affect human health by increasing risk from vector-borne diseases has been under considerable debate. OBJECTIVES We quantified potential effects of future climate change on the basic reproduction number (R0) of the tick vector of Lyme disease, Ixodes scapularis, and explored their importance for Lyme disease risk, and for vector-borne diseases in general. METHODS We applied observed temperature data for North America and projected temperatures using regional climate models to drive an I. scapularis population model to hindcast recent, and project future, effects of climate warming on R0. Modeled R0 increases were compared with R0 ranges for pathogens and parasites associated with variations in key ecological and epidemiological factors (obtained by literature review) to assess their epidemiological importance. RESULTS R0 for I. scapularis in North America increased during the years 1971-2010 in spatio-temporal patterns consistent with observations. Increased temperatures due to projected climate change increased R0 by factors (2-5 times in Canada and 1.5-2 times in the United States), comparable to observed ranges of R0 for pathogens and parasites due to variations in strains, geographic locations, epidemics, host and vector densities, and control efforts. CONCLUSIONS Climate warming may have co-driven the emergence of Lyme disease in northeastern North America, and in the future may drive substantial disease spread into new geographic regions and increase tick-borne disease risk where climate is currently suitable. Our findings highlight the potential for climate change to have profound effects on vectors and vector-borne diseases, and the need to refocus efforts to understand these effects.
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Affiliation(s)
- Nicholas H Ogden
- Zoonoses Division, Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Saint-Hyacinthe, Quebec, Canada
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The prevalence of Borrelia miyamotoi infection, and co-infections with other Borrelia spp. in Ixodes scapularis ticks collected in Canada. Parasit Vectors 2014; 7:183. [PMID: 24731287 PMCID: PMC4001108 DOI: 10.1186/1756-3305-7-183] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Accepted: 04/02/2014] [Indexed: 11/15/2022] Open
Abstract
Background Blacklegged ticks, Ixodes scapularis are vectors of the tick-borne pathogens Borrelia burgdorferi, Anaplasma phagocytophilum and Babesia microti. Recently, the I. scapularis-borne bacterium Borrelia miyamotoi has been linked to human illness in North America. The range of this tick is expanding in Canada which may increase the potential for human exposure to these agents. Methods In this study, 4938 I. scapularis ticks collected in 2012 were tested following a newly developed PCR-based testing protocol to determine the prevalence of infection with B. miyamotoi and other pathogens in I. scapularis in Canada. Results Borrelia miyamotoi was detected in blacklegged ticks from all provinces except Newfoundland, although the infection prevalence was low (<1%). There was significant variation among provinces in the prevalence of infection of ticks with B. burgdorferi and A. phagocytophilum, but not with B. miyamotoi. Conclusions Given the widespread distribution of B. miyamotoi, infection due to this agent should be considered in patients who have been exposed to blacklegged ticks in Canada.
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Werden L, Barker IK, Bowman J, Gonzales EK, Leighton PA, Lindsay LR, Jardine CM. Geography, deer, and host biodiversity shape the pattern of Lyme disease emergence in the Thousand Islands Archipelago of Ontario, Canada. PLoS One 2014; 9:e85640. [PMID: 24416435 PMCID: PMC3887107 DOI: 10.1371/journal.pone.0085640] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 12/04/2013] [Indexed: 11/19/2022] Open
Abstract
In the Thousand Islands region of eastern Ontario, Canada, Lyme disease is emerging as a serious health risk. The factors that influence Lyme disease risk, as measured by the number of blacklegged tick (Ixodes scapularis) vectors infected with Borrelia burgdorferi, are complex and vary across eastern North America. Despite study sites in the Thousand Islands being in close geographic proximity, host communities differed and both the abundance of ticks and the prevalence of B. burgdorferi infection in them varied among sites. Using this archipelago in a natural experiment, we examined the relative importance of various biotic and abiotic factors, including air temperature, vegetation, and host communities on Lyme disease risk in this zone of recent invasion. Deer abundance and temperature at ground level were positively associated with tick abundance, whereas the number of ticks in the environment, the prevalence of B. burgdorferi infection, and the number of infected nymphs all decreased with increasing distance from the United States, the presumed source of this new endemic population of ticks. Higher species richness was associated with a lower number of infected nymphs. However, the relative abundance of Peromyscus leucopus was an important factor in modulating the effects of species richness such that high biodiversity did not always reduce the number of nymphs or the prevalence of B. burgdorferi infection. Our study is one of the first to consider the interaction between the relative abundance of small mammal hosts and species richness in the analysis of the effects of biodiversity on disease risk, providing validation for theoretical models showing both dilution and amplification effects. Insights into the B. burgdorferi transmission cycle in this zone of recent invasion will also help in devising management strategies as this important vector-borne disease expands its range in North America.
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Affiliation(s)
- Lisa Werden
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
- Parks Canada Agency, Thousand Islands National Park, Mallorytown, Ontario, Canada
| | - Ian K. Barker
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
- Canadian Cooperative Wildlife Health Centre, Guelph, Ontario, Canada
| | - Jeff Bowman
- Ontario Ministry of Natural Resources, Peterborough, Ontario, Canada
| | | | - Patrick A. Leighton
- Department of Pathology and Microbiology, Faulty of Veterinary Medicine, University of Montréal, Saint-Hyacinthe, Quebec, Canada
| | | | - Claire M. Jardine
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
- Canadian Cooperative Wildlife Health Centre, Guelph, Ontario, Canada
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37
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Ogden NH, Mechai S, Margos G. Changing geographic ranges of ticks and tick-borne pathogens: drivers, mechanisms and consequences for pathogen diversity. Front Cell Infect Microbiol 2013; 3:46. [PMID: 24010124 PMCID: PMC3756306 DOI: 10.3389/fcimb.2013.00046] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 08/04/2013] [Indexed: 12/30/2022] Open
Abstract
The geographic ranges of ticks and tick-borne pathogens are changing due to global and local environmental (including climatic) changes. In this review we explore current knowledge of the drivers for changes in the ranges of ticks and tick-borne pathogen species and strains via effects on their basic reproduction number (R0), and the mechanisms of dispersal that allow ticks and tick-borne pathogens to invade suitable environments. Using the expanding geographic distribution of the vectors and agent of Lyme disease as an example we then investigate what could be expected of the diversity of tick-borne pathogens during the process of range expansion, and compare this with what is currently being observed. Lastly we explore how historic population and range expansions and contractions could be reflected in the phylogeography of ticks and tick-borne pathogens seen in recent years, and conclude that combined study of currently changing tick and tick-borne pathogen ranges and diversity, with phylogeographic analysis, may help us better predict future patterns of invasion and diversity.
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Affiliation(s)
- Nick H Ogden
- Zoonoses Division, Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Saint-Hyacinthe, QC, Canada. nicholas.ogden@ phac-aspc.gc.ca
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Bouchard C, Beauchamp G, Leighton PA, Lindsay R, Bélanger D, Ogden NH. Does high biodiversity reduce the risk of Lyme disease invasion? Parasit Vectors 2013; 6:195. [PMID: 23816142 PMCID: PMC3728044 DOI: 10.1186/1756-3305-6-195] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 06/22/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND It has been suggested that increasing biodiversity, specifically host diversity, reduces pathogen and parasite transmission amongst wildlife (causing a "dilution effect"), whereby transmission amongst efficient reservoir hosts, (e.g. Peromyscus spp. mice for the agent of Lyme disease Borrelia burgdorferi) is reduced by the presence of other less efficient host species. If so, then increasing biodiversity should inhibit pathogen and parasite invasion. METHODS We investigated this hypothesis by studying invasion of B. burgdorferi and its tick vector Ixodes scapularis in 71 field sites in southeastern Canada. Indices of trapped rodent host diversity, and of biodiversity of the wider community, were investigated as variables explaining the numbers of I. scapularis collected and B. burgdorferi infection in these ticks. A wide range of alternative environmental explanatory variables were also considered. RESULTS The observation of low I. scapularis abundance and low B. burgdorferi infection prevalence in sites where I. scapularis were detected was consistent with early-stage invasion of the vector. There were significant associations between the abundance of ticks and season, year of study and ambient temperature. Abundance of host-seeking larvae was significantly associated with deer density, and abundance of host-seeking larvae and nymphs were positively associated with litter layer depth. Larval host infestations were lower where the relative proportion of non-Peromyscus spp. was high. Infestations of hosts with nymphs were lower when host species richness was higher, but overall nymphal abundance increased with species richness because Peromyscus spp. mouse abundance and host species richness were positively correlated. Nymphal infestations of hosts were lower where tree species richness was higher. B. burgdorferi infection prevalence in ticks varied significantly with an index of rates of migratory bird-borne vector and pathogen invasion. CONCLUSIONS I. scapularis abundance and B. burgdorferi prevalence varied with explanatory variables in patterns consistent with the known biology of these species in general, and in the study region in particular. The evidence for a negative effect of host biodiversity on I. scapularis invasion was mixed. However, some evidence suggests that community biodiversity beyond just host diversity may have direct or indirect inhibitory effects on parasite invasion that warrant further study.
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Affiliation(s)
- Catherine Bouchard
- Groupe de recherche en épidémiologie des zoonoses et santé publique, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada
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