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Shan J, Jia Y, Hickenbotham P, Teulières L, Clokie MRJ. Combining citizen science and molecular diagnostic methods to investigate the prevalence of Borrelia burgdorferi s.l. and Borrelia miyamotoi in tick pools across Great Britain. Front Microbiol 2023; 14:1126498. [PMID: 37180256 PMCID: PMC10169747 DOI: 10.3389/fmicb.2023.1126498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 03/31/2023] [Indexed: 05/16/2023] Open
Abstract
Lyme disease is the most common tick-borne disease and is caused by a group of bacteria known as Borrelia burgdorferi sensu lato (s.l.) complex. Sharing the same genus as B. burgdorferi, Borrelia miyamotoi is a distinct genotype that causes relapsing fever disease. This emerging tick-borne disease is increasingly becoming a concern in public health. To investigate the prevalence of B. burgdorferi s.l. and B. miyamotoi in ticks first, we developed a PCR (Bmer-qPCR) that targets the phage terminase large subunit (terL) gene carried by B. miyamotoi. A similar approach had been used successfully in developing Ter-qPCR for detecting B. burgdorferi s.l. The terL protein functions as an enzyme in packaging phage DNA. Analytical validation of the Bmer-qPCR confirmed its specificity, efficiency and sensitivity. Second, we designed a citizen science-based approach to detect 838 ticks collected from numerous sites across Great Britain. Finally, we applied Bmer-qPCR and Ter-qPCR to 153 tick pools and revealed that the prevalence of B. burgdorferi s.l. and B. miyamotoi was dependent on their geographical locations, i.e. Scotland showed a higher rate of B. burgdorferi s.l. and lower rate of B. miyamotoi carriage as compared to those of the England data. A pattern of diminishing rate of B. miyamotoi carriage from southern England to northern Scotland was visible. Together, the citizen science-based approach provided an estimation of the carriage rate of B. burgdorferi s.l. and B. miyamotoi in tick pools and a potential spreading pattern of B. miyamotoi from the south to the north of Great Britain. Our findings underscore the power of combining citizen science with the molecular diagnostic method to reveal hidden pattern of pathogen-host-environment interplay. Our approach can provide a powerful tool to elucidate the ecology of tick-borne diseases and may offer guidance for pathogen control initiatives. In an era of limited resources, monitoring pathogens requires both field and laboratory support. Citizen science approaches provide a method to empower the public for sample collection. Coupling citizen science approaches with laboratory diagnostic tests can make real-time monitoring of pathogen distribution and prevalence possible.
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Affiliation(s)
- Jinyu Shan
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
| | - Ying Jia
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
| | - Peter Hickenbotham
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
| | | | - Martha R. J. Clokie
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
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Medlock JM, Vaux AGC, Gandy S, Cull B, McGinley L, Gillingham E, Catton M, Pullan ST, Hansford KM. Spatial and temporal heterogeneity of the density of Borrelia burgdorferi-infected Ixodes ricinus ticks across a landscape: A 5-year study in southern England. MEDICAL AND VETERINARY ENTOMOLOGY 2022; 36:356-370. [PMID: 35521893 PMCID: PMC9545817 DOI: 10.1111/mve.12574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 03/17/2022] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
The density of Borrelia burgdorferi-infected Ixodes ricinus nymphs (DIN) was investigated during 2013-2017 across a Lyme disease-endemic landscape in southern England. The density of nymphs (DON), nymph infection prevalence (NIP), and DIN varied across five different natural habitats, with the highest DIN in woodland edge and high biodiversity woodlands. DIN was significantly lower in scrub grassland compared to the woodland edge, with low DON and no evidence of infection in ticks in non-scrub grassland. Over the 5 years, DON, NIP and DIN were comparable within habitats, except in 2014, with NIP varying three-fold and DIN significantly lower compared to 2015-2017. Borrelia garinii was most common, with bird-associated Borrelia (B. garinii/valaisiana) accounting for ~70% of all typed sequences. Borrelia burgdorferi sensu stricto was more common than B. afzelii. Borrelia afzelii was more common in scrub grassland than woodland and absent in some years. The possible impact of scrub on grazed grassland, management of ecotonal woodland margins with public access, and the possible role of birds/gamebirds impacting NIP are discussed. Mean NIP was 7.6%, highlighting the potential risk posed by B. burgdorferi in this endemic area. There is a need for continued research to understand its complex ecology and identify strategies for minimizing risk to public health, through habitat/game management and public awareness.
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Affiliation(s)
- Jolyon M. Medlock
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Alexander G. C. Vaux
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Sara Gandy
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Benjamin Cull
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Liz McGinley
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Emma Gillingham
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Matthew Catton
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
| | - Steven T. Pullan
- Diagnostic & Genomic TechnologiesUK Health Security AgencySalisburyWiltshireUK
| | - Kayleigh M. Hansford
- Medical Entomology & Zoonoses Ecology GroupUK Health Security AgencySalisburyWiltshireUK
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Meta-analysis: A useful tool to assess infection prevalence and disease ecology of Borrelia burgdorferi sensu lato in nymphal ticks in North-Western Europe with recommendations for a standardised approach to future studies. Parasite Epidemiol Control 2022; 18:e00254. [PMID: 35677189 PMCID: PMC9167692 DOI: 10.1016/j.parepi.2022.e00254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 05/13/2022] [Accepted: 05/22/2022] [Indexed: 12/30/2022] Open
Abstract
Lyme borreliosis is a vector-borne disease of concern in Europe. While neuroborreliosis data are reportable at EU level, it can nevertheless be difficult to make comparisons of disease risk between neighbouring countries. This study used proportion meta-analyses to compare environmental markers of disease risk between woodland sites in two countries in North-Western Europe (Ireland, Scotland). 73 site-visits from 12 publications were analysed, resulting in a significantly higher pooled nymphal infection prevalence (NIP) in Ireland (8.2% (95% CI: 5.9–11.4%)) than Scotland (1.7%(95% CI 1.1–2.5%)). All other analysed parameters of disease risk were also higher in Ireland than Scotland. Subgroup-meta-analyses and meta-regressions were used to assess the influence of environmental variables on NIP. NIP increased significantly with increasing woodland size in Ireland, but not Scotland, which may be accounted for by Ireland's highly fragmented landscape. Assuming the application of strict inclusion/exclusion criteria and control of variables, proportion meta-analysis can provide useful insights in disease ecology, as it allows for the achievement of high study powers incorporating samples collected across multiple sites, which is otherwise often a prohibitively difficult and resource-heavy feat in environmental studies in disease ecology. A standardised approach to data collection is recommended to achieve more robust meta-analyses in future in conjunction with additional research on environmental factors affecting Lyme borreliosis risk in Europe, particularly pertaining to the impact of host species on NIP.
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Urban woodland habitat is important for tick presence and density in a city in England. Ticks Tick Borne Dis 2021; 13:101857. [PMID: 34763308 DOI: 10.1016/j.ttbdis.2021.101857] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 07/30/2021] [Accepted: 10/20/2021] [Indexed: 12/11/2022]
Abstract
Urban green spaces provide an opportunity for contact between members of the public and ticks infected with pathogens. Understanding tick distribution within these areas and the drivers for increased tick density or Borrelia infection are important from a risk management perspective. This study aimed to generate data on tick presence, nymph density and Borrelia infection across a range of urban green space habitats, in order to identify those that may potentially present a higher risk of Lyme borreliosis to members of the public. Several sites were visited across the English city of Bath during 2015 and 2016. Tick presence was confirmed in all habitats surveyed, with increased likelihood in woodland and woodland edge. Highest nymph densities were also reported in these habitats, along with grassland during one of the sampling years. Adult ticks were more likely to be infected compared to nymphs, and the highest densities of infected nymphs were associated with woodland edge habitat. In addition to Lyme borreliosis causing Borrelia genospecies, Borrelia miyamotoi was also detected at several sites. This study adds to the growing evidence that urban green space habitats present a public health risk from tick bites, and this has implications for many policy areas including health and wellbeing, climate adaptation and urban green space planning.
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Cull B, Hansford KM, McGinley L, Gillingham EL, Vaux AGC, Smith R, Medlock JM. A nationwide study on Borrelia burgdorferi s.l. infection rates in questing Ixodes ricinus: a six-year snapshot study in protected recreational areas in England and Wales. MEDICAL AND VETERINARY ENTOMOLOGY 2021; 35:352-360. [PMID: 33415732 DOI: 10.1111/mve.12503] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 11/17/2020] [Accepted: 12/10/2020] [Indexed: 05/10/2023]
Abstract
Understanding the variation in Borrelia burgdorferi s.l. infection rates in Ixodes ricinus ticks is important for assessing the potential for Lyme borreliosis transmission. This study aimed to investigate infection rates of B. burgdorferi s.l. bacteria in I. ricinus across 24 field sites in England and Wales, focussing on protected recreational areas in National Parks (NPs) and Areas of Outstanding Natural Beauty (AONBs), to provide comparable data across multiple years to assess spatio-temporal changes in B. burgdorferi s.l. infection. Working with park rangers, questing ticks were collected each spring from 2014 to 2019. A subset of ticks, 4104 nymphs, were analysed using a pan-Borrelia qPCR assay, as well as a Borrelia miyamotoi-specific qPCR, and sequenced to determine Borrelia burgdorferi s.l. genospecies. Site-specific B. burgdorferi s.l. infection rates in I. ricinus nymphs varied from 0% to 24%, with overall infection rates ranging from 2.5% to 5.1% across the years. Genospecies composition of sequenced samples was 62.5% B. garinii, 20.3% B. valaisiana and 17.2% B. afzelii. Borrelia miyamotoi was detected in 0.2% of ticks. This study increases our knowledge on B. burgdorferi s.l.. infection in areas used by the public for outdoor activity across England and Wales, highlighting the spatial and temporal variability which can impact the changing risk to humans from infected tick bites.
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Affiliation(s)
- B Cull
- Medical Entomology & Zoonoses Ecology, Emergency Response Department Science & Technology, Public Health England, Porton Down, U.K
| | - K M Hansford
- Medical Entomology & Zoonoses Ecology, Emergency Response Department Science & Technology, Public Health England, Porton Down, U.K
- Health Protection Research Unit in Environmental Change and Health, Public Health England, Porton Down, U.K
| | - L McGinley
- Medical Entomology & Zoonoses Ecology, Emergency Response Department Science & Technology, Public Health England, Porton Down, U.K
| | - E L Gillingham
- Medical Entomology & Zoonoses Ecology, Emergency Response Department Science & Technology, Public Health England, Porton Down, U.K
- Health Protection Research Unit in Environmental Change and Health, Public Health England, Porton Down, U.K
| | - A G C Vaux
- Medical Entomology & Zoonoses Ecology, Emergency Response Department Science & Technology, Public Health England, Porton Down, U.K
| | - R Smith
- Health Protection Division, Public Health Wales, Cardiff, U.K
| | - J M Medlock
- Medical Entomology & Zoonoses Ecology, Emergency Response Department Science & Technology, Public Health England, Porton Down, U.K
- Health Protection Research Unit in Environmental Change and Health, Public Health England, Porton Down, U.K
- Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Porton Down, U.K
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Olsthoorn F, Sprong H, Fonville M, Rocchi M, Medlock J, Gilbert L, Ghazoul J. Occurrence of tick-borne pathogens in questing Ixodes ricinus ticks from Wester Ross, Northwest Scotland. Parasit Vectors 2021; 14:430. [PMID: 34446082 PMCID: PMC8393815 DOI: 10.1186/s13071-021-04946-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 08/11/2021] [Indexed: 11/28/2022] Open
Abstract
Background Lyme borreliosis and other tick-borne diseases emerge from increased interactions between humans, other animals, and infected ticks. The risk of acquiring a tick-borne infection varies across space and time, so knowledge of the occurrence and prevalence of pathogens in ticks can facilitate disease diagnosis in a specific area and the implementation of mitigation measures and awareness campaigns. Here we identify the occurrence and prevalence of several pathogens in Ixodes ricinus ticks in Wester Ross, Northwest Scotland, a region of high tourism and tick exposure, yet data-poor in terms of tick-borne pathogens. Methods Questing I. ricinus nymphs (n = 2828) were collected from 26 sites in 2018 and 2019 and tested for the presence of tick-borne pathogens using PCR-based methods. Prevalence was compared with other regions of Scotland, England, Wales, and the Netherlands. Results Anaplasma phagocytophilum (4.7% prevalence), Borrelia burgdorferi sensu lato (s.l.) (2.2%), Babesia from clade X (0.2%), Rickettsia helvetica (0.04%), and Spiroplasma ixodetis (0.4%) were detected, but no Neoehrlichia mikurensis, Borrelia miyamotoi, or Babesia microti. Typing of A. phagocytophilum using a fragment of the GroEL gene identified the presence of both ecotype I and ecotype II. Genospecies identification of Borrelia burgdorferi s.l. revealed B. afzelii (53% of infected nymphs), B. garinii (9%), B. burgdorferi sensu stricto (7%), and B. valaisiana (31%). We found similar prevalence of A. phagocytophilum in Wester Ross as in the Netherlands, but higher than in other parts of Great Britain. We found lower B. burgdorferi s.l. prevalence than in England or the Netherlands, and similar to some other Scottish studies. We found higher prevalence of B. valaisiana and lower prevalence of B. garinii than in other Scottish studies. We found S. ixodetis at much lower prevalence than in the Netherlands, and R. helvetica at much lower prevalence than in England and the Netherlands. Conclusions As far as we know, this is the first description of S. ixodetis in Great Britain. The results are relevant for disease surveillance and management for public and veterinary health. The findings can also aid in designing targeted public health campaigns and in raising awareness among outdoor recreationists and professionals. Graphical abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-04946-5.
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Affiliation(s)
- Fanny Olsthoorn
- Institute of Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zürich, Universitätstrasse 16, 8092, Zürich, Switzerland.
| | - Hein Sprong
- Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Antonie van Leeuwenhoeklaan 9, 3720 MA, Bilthoven, The Netherlands
| | - Manoj Fonville
- Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Antonie van Leeuwenhoeklaan 9, 3720 MA, Bilthoven, The Netherlands
| | - Mara Rocchi
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, EH26 0PZ, UK
| | - Jolyon Medlock
- Medical Entomology and Zoonoses Ecology Group, Emergency Response Department Science and Technology, Public Health England, Porton Down, Salisbury, SP4 0JG, Wiltshire, UK
| | - Lucy Gilbert
- Institute of Biodiversity, Animal Health and Comparative Medicine, Graham Kerr Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Jaboury Ghazoul
- Institute of Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zürich, Universitätstrasse 16, 8092, Zürich, Switzerland
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Tulloch JSP, Christley RM, Radford AD, Warner JC, Beadsworth MBJ, Beeching NJ, Vivancos R. A descriptive epidemiological study of the incidence of newly diagnosed Lyme disease cases in a UK primary care cohort, 1998-2016. BMC Infect Dis 2020; 20:285. [PMID: 32299372 PMCID: PMC7164244 DOI: 10.1186/s12879-020-05018-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 04/07/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Primary care is likely to see the highest number of Lyme disease patients. Despite this, there is limited published data regarding Lyme disease patients accessing primary care in the UK. We aim to describe trends in the incidence of a new diagnosis, and demographics of patients identified in a primary care electronic health database. METHODS A descriptive epidemiological study of Lyme disease coded patients in UK primary care. 3725 patients coded for Lyme disease during 1998-2016 were identified within The Health Improvement Network (THIN). Incidence rates and the demographics of cases identified were described. Poisson regression was used to analyse socio-demographic characteristics of the cases. RESULTS There was an increase in annual crude incidence rates, peaking in 2015 at 5.47 (95% CI 4.85-6.14) cases per 100,000 population per year. Multivariable analysis showed there were significant differences in the ages of those affected, incidence of a new diagnosis rose as deprivation levels improved, and that there was a higher incidence of cases living in rural areas compared to urban areas. There was no significant difference between sexes for the UK. Cases were significantly more likely to identify with being white compared to the national population. CONCLUSIONS An increasing incidence of patients newly coded with Lyme disease related Read codes was identified using data from a UK national primary care database. By comparing these incidence figures with national laboratory-confirmed surveillance data, a multiplication factor of 2.35 (95%CI 1.81-2.88) can be calculated in order to estimate the annual number of cases seen in primary care. The significant socio-demographic variables associated with a Lyme disease diagnosis likely reflect a complex interplay of socio-economic issues, which needs to be further explored. Future work is needed to examine the treatment and management of patients within this database.
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Affiliation(s)
- John S P Tulloch
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, L69 3GL, UK.
- Public Health England, L3 1DS, Liverpool, UK.
| | - Robert M Christley
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, L69 3GL, UK
- Institute of Infection and Global Health, University of Liverpool, Liverpool, CH64 7TE, UK
| | - Alan D Radford
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, L69 3GL, UK
- Institute of Infection and Global Health, University of Liverpool, Liverpool, CH64 7TE, UK
| | - Jenny C Warner
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Porton Down, SP4 0JQ, UK
- Rare and Imported Pathogens Laboratory, Public Health England, Porton Down, SP4 0JQ, UK
| | - Mike B J Beadsworth
- Tropical and Infectious Disease Unit, Royal Liverpool University Hospital, Liverpool, L7 8XP, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, L3 5QA, UK
| | - Nick J Beeching
- Tropical and Infectious Disease Unit, Royal Liverpool University Hospital, Liverpool, L7 8XP, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, L3 5QA, UK
| | - Roberto Vivancos
- Public Health England, L3 1DS, Liverpool, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Liverpool, L3 1DS, UK
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Gillingham EL, Hansford KM, Meadows S, Henney J, Wieckowski F, Hernández-Triana LM, Muscat I, Muscat J, Beckert C, Nikolova NI, Cull B, Medlock JM. Ticks on the Channel Islands and implications for public health. Ticks Tick Borne Dis 2020; 11:101405. [PMID: 32046929 DOI: 10.1016/j.ttbdis.2020.101405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 01/27/2020] [Accepted: 02/03/2020] [Indexed: 12/19/2022]
Abstract
The Channel Islands are British Crown dependencies located in the English Channel to the west of the Normandy coast in northern France. Whilst there have been studies investigating tick occurrence and distribution in different habitats on the mainland of the UK and in France, the Channel Islands have been relatively understudied. As such, little is known about whether the sheep tick, Ixodes ricinus, is present, and whether there is a potential risk of Lyme borreliosis on the Channel Islands. To ascertain the presence of I. ricinus on the three largest islands in the archipelago: Jersey, Guernsey and Alderney, surveys of ticks questing in the vegetation and ticks feeding on hosts were undertaken during April and May 2016. Across all three islands, the highest numbers of ticks were found in woodland habitats. Ixodes ricinus was the predominant questing tick species found on Jersey, and Ixodes ventalloi the most common questing tick species on Alderney and Guernsey, with little or no evidence of questing I. ricinus on either island. During field studies on small mammals, I. ricinus was the predominant tick species feeding on Jersey bank voles (Myodes glareolus caesarius), with Ixodes hexagonus the most common species infesting hedgehogs on Guernsey. We propose that the greater diversity of small mammals on Jersey may be important in supporting immature stages of I. ricinus, in contrast to Guernsey and Alderney. Morphological identification of tick species was confirmed by PCR sequencing based on amplification of the cytochrome c oxidase subunit one (cox1) gene (COI DNA barcoding). To date, there have been few records of human tick bites in the Channel Islands, suggesting that the current risk from tick-borne disease may be low, but continued reporting of any human tick bites, along with reporting of cases of Lyme borreliosis will be important for continued assessment of the impact of tick-borne diseases in the Channel Islands.
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Affiliation(s)
- Emma L Gillingham
- Medical Entomology and Zoonoses Ecology, Emergency Response Department, Public Health England, Porton Down, Salisbury, SP4 0JG, UK; NIHR Health Protection Research Unit in Environmental Change and Health, UK.
| | - Kayleigh M Hansford
- Medical Entomology and Zoonoses Ecology, Emergency Response Department, Public Health England, Porton Down, Salisbury, SP4 0JG, UK; NIHR Health Protection Research Unit in Environmental Change and Health, UK
| | - Scott Meadows
- Howard Davis Farm, la Route de la Trinité, Trinity, JE3 5JP, Jersey
| | - Julia Henney
- Environment Guernsey Ltd, The Old Tobacco Factory, Route De La Ramee, St. Peter Port, GY1 2ET, Guernsey
| | - Filip Wieckowski
- Alderney Wildlife Trust, 51 Victoria Street, St Anne, Alderney, GY93TA, Guernsey
| | - Luis M Hernández-Triana
- Wildlife Zoonoses and Vector-Borne Research Group, Department of Virology, Animal and Plant Health Agency, Addlestone, Surrey, KT15 3NB, UK
| | - Ivan Muscat
- Jersey General Hospital, The Parade, St Helier, JE1 3QS, Jersey
| | - Joseph Muscat
- Charles University, Opletalova 38, 110 00, Staré Město, Czechia
| | - Clara Beckert
- Charles University, Opletalova 38, 110 00, Staré Město, Czechia
| | - Nadya I Nikolova
- Biodiversity Institute of Ontario, University of Guelph, Ontario, N1G 2W1, Canada
| | - Ben Cull
- Medical Entomology and Zoonoses Ecology, Emergency Response Department, Public Health England, Porton Down, Salisbury, SP4 0JG, UK
| | - Jolyon M Medlock
- Medical Entomology and Zoonoses Ecology, Emergency Response Department, Public Health England, Porton Down, Salisbury, SP4 0JG, UK; NIHR Health Protection Research Unit in Environmental Change and Health, UK; NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, UK
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Tulloch JSP, Semper AE, Brooks TJG, Russell K, Halsby KD, Christley RM, Radford AD, Vivancos R, Warner JC. The demographics and geographic distribution of laboratory-confirmed Lyme disease cases in England and Wales (2013-2016): an ecological study. BMJ Open 2019; 9:e028064. [PMID: 31362976 PMCID: PMC6677960 DOI: 10.1136/bmjopen-2018-028064] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE Lyme disease is a tick-borne disease of increasing incidence and public concern across the Northern Hemisphere. However, the socio-demographics and geographic distribution of the population affected in England and Wales are poorly understood. Therefore, the proposed study was designed to describe the demographics and distribution of laboratory-confirmed cases of Lyme disease from a national testing laboratory. DESIGN An ecological study of routinely collected laboratory surveillance data. SETTING Public Health England's national Lyme disease testing laboratory. PARTICIPANTS 3986 laboratory-confirmed cases of Lyme disease between 2013 and 2016. RESULTS In England and Wales, the incidence of laboratory-confirmed Lyme disease rose significantly over the study period from 1.62 cases per 100 000 in 2013 to 1.95 cases per 100 000 in 2016. There was a bimodal age distribution (with peaks at 6-10 and 61-65 years age bands) with a predominance of male patients. A significant clustering of areas with high Lyme disease incidence was located in southern England. An association was found between disease incidence and socioeconomic status, based on the patient's resident postcode, with more cases found in less deprived areas. Cases were disproportionately found in rural areas compared with the national population distribution. CONCLUSIONS These results suggest that Lyme disease patients originate from areas with higher socioeconomic status and disproportionately in rural areas. Identification of the Lyme disease hotspots in southern England, alongside the socio-demographics described, will enable a targeted approach to public health interventions and messages.
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Affiliation(s)
- John S P Tulloch
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK
- Field Epidemiology Service, Public Health England, Liverpool, UK
| | - Amanda E Semper
- Rare and Imported Pathogens Laboratory, Public Health England, Porton Down, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Porton Down, UK
| | - Tim J G Brooks
- Rare and Imported Pathogens Laboratory, Public Health England, Porton Down, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Porton Down, UK
| | | | - Kate D Halsby
- National Infection Service, Public Health England, London, UK
| | - Robert M Christley
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK
- Institute of Infection and Global Health, University of Liverpool, Neston, UK
| | - Alan D Radford
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Liverpool, UK
- Institute of Infection and Global Health, University of Liverpool, Neston, UK
| | - Roberto Vivancos
- Field Epidemiology Service, Public Health England, Liverpool, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Liverpool, UK
| | - Jenny C Warner
- Rare and Imported Pathogens Laboratory, Public Health England, Porton Down, UK
- NIHR Health Protection Research Unit in Emerging and Zoonotic Infections, Public Health England, Porton Down, UK
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Millins C, Dickinson ER, Isakovic P, Gilbert L, Wojciechowska A, Paterson V, Tao F, Jahn M, Kilbride E, Birtles R, Johnson P, Biek R. Landscape structure affects the prevalence and distribution of a tick-borne zoonotic pathogen. Parasit Vectors 2018; 11:621. [PMID: 30514350 PMCID: PMC6278045 DOI: 10.1186/s13071-018-3200-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 11/13/2018] [Indexed: 12/13/2022] Open
Abstract
Background Landscape structure can affect pathogen prevalence and persistence with consequences for human and animal health. Few studies have examined how reservoir host species traits may interact with landscape structure to alter pathogen communities and dynamics. Using a landscape of islands and mainland sites we investigated how natural landscape fragmentation affects the prevalence and persistence of the zoonotic tick-borne pathogen complex Borrelia burgdorferi (sensu lato), which causes Lyme borreliosis. We hypothesized that the prevalence of B. burgdorferi (s.l.) would be lower on islands compared to the mainland and B. afzelii, a small mammal specialist genospecies, would be more affected by isolation than bird-associated B. garinii and B. valaisiana and the generalist B. burgdorferi (sensu stricto). Methods Questing (host-seeking) nymphal I. ricinus ticks (n = 6567) were collected from 12 island and 6 mainland sites in 2011, 2013 and 2015 and tested for B. burgdorferi (s.l.). Deer abundance was estimated using dung transects. Results The prevalence of B. burgdorferi (s.l.) was significantly higher on the mainland (2.5%, 47/1891) compared to island sites (0.9%, 44/4673) (P < 0.01). While all four genospecies of B. burgdorferi (s.l.) were detected on the mainland, bird-associated species B. garinii and B. valaisiana and the generalist genospecies B. burgdorferi (s.s.) predominated on islands. Conclusion We found that landscape structure influenced the prevalence of a zoonotic pathogen, with a lower prevalence detected among island sites compared to the mainland. This was mainly due to the significantly lower prevalence of small mammal-associated B. afzelii. Deer abundance was not related to pathogen prevalence, suggesting that the structure and dynamics of the reservoir host community underpins the observed prevalence patterns, with the higher mobility of bird hosts compared to small mammal hosts leading to a relative predominance of the bird-associated genospecies B. garinii and generalist genospecies B. burgdorferi (s.s.) on islands. In contrast, the lower prevalence of B. afzelii on islands may be due to small mammal populations there exhibiting lower densities, less immigration and stronger population fluctuations. This study suggests that landscape fragmentation can influence the prevalence of a zoonotic pathogen, dependent on the biology of the reservoir host. Electronic supplementary material The online version of this article (10.1186/s13071-018-3200-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Caroline Millins
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK. .,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, Scotland, UK. .,School of Veterinary Medicine, University of Glasgow, Glasgow, Scotland, UK.
| | - Eleanor R Dickinson
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK
| | - Petra Isakovic
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK.,, Present address: Zakot 43, 8250, Brezice, Slovenia
| | - Lucy Gilbert
- James Hutton Institute, Craigiebuckler, Aberdeen, Scotland, UK
| | - Agnieszka Wojciechowska
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK.,Present address: Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - Victoria Paterson
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK
| | - Feng Tao
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK.,Present address: Wayne State University, 42 W. Warren Ave, Detroit, MI, 48202, USA
| | - Martin Jahn
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK.,Present address: GEOMAR - Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, D-24105, Kiel, Germany
| | - Elizabeth Kilbride
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK
| | - Richard Birtles
- School of Environment and Life Sciences, University of Salford, Salford, England, UK
| | - Paul Johnson
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK.,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, Scotland, UK
| | - Roman Biek
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland, UK.,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, Scotland, UK
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11
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Medlock JM, Hansford KM, Vaux AGC, Cull B, Gillingham E, Leach S. Assessment of the Public Health Threats Posed by Vector-Borne Disease in the United Kingdom (UK). INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:E2145. [PMID: 30274268 PMCID: PMC6210260 DOI: 10.3390/ijerph15102145] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 09/24/2018] [Accepted: 09/25/2018] [Indexed: 12/21/2022]
Abstract
In recent years, the known distribution of vector-borne diseases in Europe has changed, with much new information also available now on the status of vectors in the United Kingdom (UK). For example, in 2016, the UK reported their first detection of the non-native mosquito Aedes albopictus, which is a known vector for dengue and chikungunya virus. In 2010, Culex modestus, a principal mosquito vector for West Nile virus was detected in large numbers in the Thames estuary. For tick-borne diseases, data on the changing distribution of the Lyme borreliosis tick vector, Ixodes ricinus, has recently been published, at a time when there has been an increase in the numbers of reported human cases of Lyme disease. This paper brings together the latest surveillance data and pertinent research on vector-borne disease in the UK, and its relevance to public health. It highlights the need for continued vector surveillance systems to monitor our native mosquito and tick fauna, as well as the need to expand surveillance for invasive species. It illustrates the importance of maintaining surveillance capacity that is sufficient to ensure accurate and timely disease risk assessment to help mitigate the UK's changing emerging infectious disease risks, especially in a time of climatic and environmental change and increasing global connectivity.
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Affiliation(s)
- Jolyon M Medlock
- Medical Entomology Group, Public Health England, Emergency Response Department, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
- Health Protection Research Unit in Environmental Change and Health, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
- Health Protection Research Unit in Emerging and Zoonotic Infections, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
| | - Kayleigh M Hansford
- Medical Entomology Group, Public Health England, Emergency Response Department, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
- Health Protection Research Unit in Environmental Change and Health, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
| | - Alexander G C Vaux
- Medical Entomology Group, Public Health England, Emergency Response Department, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
| | - Ben Cull
- Medical Entomology Group, Public Health England, Emergency Response Department, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
| | - Emma Gillingham
- Medical Entomology Group, Public Health England, Emergency Response Department, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
- Health Protection Research Unit in Environmental Change and Health, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
| | - Steve Leach
- Medical Entomology Group, Public Health England, Emergency Response Department, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
- Health Protection Research Unit in Emerging and Zoonotic Infections, Porton Down, Salisbury, Wiltshire SP4 0JG, UK.
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12
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Geurden T, Becskei C, Six RH, Maeder S, Latrofa MS, Otranto D, Farkas R. Detection of tick-borne pathogens in ticks from dogs and cats in different European countries. Ticks Tick Borne Dis 2018; 9:1431-1436. [PMID: 29983263 DOI: 10.1016/j.ttbdis.2018.06.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 06/19/2018] [Accepted: 06/27/2018] [Indexed: 11/25/2022]
Abstract
Ticks are known to transmit pathogens which threaten the health and welfare of companion animals and man globally. In the present study, mainly adult ticks were collected from dogs and cats presented at their local veterinary practice in Hungary, France, Italy, Belgium (dogs only) and Germany (cats only), and identified based on tick morphology. If more than one tick was collected from a host animal, ticks were pooled by tick species for DNA extraction and subsequent PCR examination for the presence of tick-borne pathogens. Out of 448 tick samples, 247 (95 from dogs and 152 from cats) were Ixodes ricinus, 26 (12 from dogs and 14 from cats) were I. hexagonus, 59 (43 from dogs and 16 from cats) were Dermacentor reticulatus and 116 (74 from dogs and 42 from cats) were Rhipicephalus sanguineus sensu lato (s.l.). In 17% of the I. ricinus samples Anaplasma phagocytophilum was found. Borrelia spp. were mainly identified in I. ricinus collected from cats (18%) and to a lesser extent in dog-sourced ticks (1%), with Borrelia afzelii (n = 11), B. garinii (n = 7), B. valaisiana (n = 5), B. lusitaniae (n = 3) and B. burgdorferi sensu stricto (n = 3) being identified. One I. hexagonus sample collected from a cat in France tested positive for B. afzelii. Babesia canis was detected in 20% of the D. reticulatus samples, mainly from Hungary. Rhipicephalus sanguineus s.l. was found positive for Hepatozoon canis (3%), A. platys (5%) and three Rickettsia species (7%; R. massiliae; R. raoultii and R. rhipicephali). Furthermore, a total of 66 R. sanguineus s.l. ticks were subjected to molecular analysis and were identified as R. sanguineus sp. II-temperate lineage, with seven haplotypes recorded. Amongst them, the most prevalent sequence types were haplotype XIII (n = 24; 69%) and haplotype XIV (n = 16; 52%) in France and in Italy, respectively, found both in cats and dogs. Although differences related to both country and host, were observed, the results of this study indicate that cats and dogs are exposed to tick-borne pathogen infected ticks, which may represent a medical risk to these host animals.
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Affiliation(s)
- Thomas Geurden
- Zoetis, Veterinary Medicine Research and Development, Hoge Wei 10, B-1930 Zaventem, Belgium.
| | - Csilla Becskei
- Zoetis, Veterinary Medicine Research and Development, Hoge Wei 10, B-1930 Zaventem, Belgium
| | - Robert H Six
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St. Kalamazoo, MI 49007 USA
| | - Steven Maeder
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St. Kalamazoo, MI 49007 USA
| | - Maria Stefania Latrofa
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari, Str.prov. per Casamassima km 3 70010 Valenzano, Bari, Italy
| | - Domenico Otranto
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari, Str.prov. per Casamassima km 3 70010 Valenzano, Bari, Italy
| | - Robert Farkas
- Department of Parasitology and Zoology, University of Veterinary Medicine, István u. 2, H-1078 Budapest, Hungary
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13
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Abdullah S, Helps C, Tasker S, Newbury H, Wall R. Prevalence and distribution of Borrelia and Babesia species in ticks feeding on dogs in the U.K. MEDICAL AND VETERINARY ENTOMOLOGY 2018; 32:14-22. [PMID: 28846148 DOI: 10.1111/mve.12257] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 04/06/2017] [Accepted: 04/24/2017] [Indexed: 06/07/2023]
Abstract
Ticks were collected during March-July 2015 from dogs by veterinarians throughout the U.K. and used to estimate current prevalences and distributions of pathogens. DNA was extracted from 4750 ticks and subjected to polymerase chain reaction and sequence analysis to identify Borrelia burgdorferi sensu lato (Spirochaetales: Spirochaetaceae) and Babesia (Piroplasmida: Babesiidae) species. Of 4737 ticks [predominantly Ixodes ricinus Linneaus (Ixodida: Ixodidae)], B. burgdorferi s.l. was detected in 94 (2.0%). Four Borrelia genospecies were identified: Borrelia garinii (41.5%); Borrelia afzelli (31.9%); Borrelia burgdorferi sensu stricto (25.5%), and Borrelia spielmanii (1.1%). One Rhipicephalus sanguineus Latreille (Ixodida: Ixodidae), collected from a dog with a history of travel outside the U.K., was positive for B. garinii. Seventy ticks (1.5%) were positive for Babesia spp. Of these, 84.3% were positive for Babesia venatorum, 10.0% for Babesia vulpes sp. nov., 2.9% for Babesia divergens/Babesia capreoli and 1.4% for Babesia microti. One isolate of Babesia canis was detected in a Dermacentor reticulatus (Ixodida: Ixodidae) tick collected from a dog that had recently travelled to France. Prevalences of B. burgdorferi s.l. and Babesia spp. did not differ significantly between different regions of the U.K. The results map the widespread distribution of B. burgdorferi s.l. and Babesia spp. in ticks in the U.K. and highlight the potential for the introduction and establishment of exotic ticks and tick-borne pathogens.
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Affiliation(s)
- S Abdullah
- Veterinary Parasitology and Ecology Group, School of Biological Sciences, University of Bristol, Bristol, U.K
| | - C Helps
- Molecular Diagnostic Unit, Langford Vets and School of Veterinary Sciences, University of Bristol, Bristol, U.K
| | - S Tasker
- Molecular Diagnostic Unit, Langford Vets and School of Veterinary Sciences, University of Bristol, Bristol, U.K
| | - H Newbury
- MSD Animal Health, Milton Keynes, U.K
| | - R Wall
- Veterinary Parasitology and Ecology Group, School of Biological Sciences, University of Bristol, Bristol, U.K
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14
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Hall JL, Alpers K, Bown KJ, Martin SJ, Birtles RJ. Use of Mass-Participation Outdoor Events to Assess Human Exposure to Tickborne Pathogens. Emerg Infect Dis 2018; 23:463-467. [PMID: 28221107 PMCID: PMC5382723 DOI: 10.3201/eid2303.161397] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Mapping the public health threat of tickborne pathogens requires quantification of not only the density of infected host-seeking ticks but also the rate of human exposure to these ticks. To efficiently sample a high number of persons in a short time, we used a mass-participation outdoor event. In June 2014, we sampled ≈500 persons competing in a 2-day mountain marathon run across predominantly tick-infested habitat in Scotland. From the number of tick bites recorded and prevalence of tick infection with Borrelia burgdoferi sensu lato and B. miyamotoi, we quantified the frequency of competitor exposure to the pathogens. Mass-participation outdoor events have the potential to serve as excellent windows for epidemiologic study of tickborne pathogens; their concerted use should improve spatial and temporal mapping of human exposure to infected ticks.
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15
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Layzell SJ, Bailey D, Peacey M, Nuttall PA. Prevalence of Borrelia burgdorferi and Borrelia miyamotoi in questing Ixodes ricinus ticks from four sites in the UK. Ticks Tick Borne Dis 2018; 9:217-224. [DOI: 10.1016/j.ttbdis.2017.09.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 09/14/2017] [Accepted: 09/14/2017] [Indexed: 10/18/2022]
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16
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Millins C, Gilbert L, Medlock J, Hansford K, Thompson DB, Biek R. Effects of conservation management of landscapes and vertebrate communities on Lyme borreliosis risk in the United Kingdom. Philos Trans R Soc Lond B Biol Sci 2018; 372:rstb.2016.0123. [PMID: 28438912 PMCID: PMC5413871 DOI: 10.1098/rstb.2016.0123] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2016] [Indexed: 02/01/2023] Open
Abstract
Landscape change and altered host abundance are major drivers of zoonotic pathogen emergence. Conservation and biodiversity management of landscapes and vertebrate communities can have secondary effects on vector-borne pathogen transmission that are important to assess. Here we review the potential implications of these activities on the risk of Lyme borreliosis in the United Kingdom. Conservation management activities include woodland expansion, management and restoration, deer management, urban greening and the release and culling of non-native species. Available evidence suggests that increasing woodland extent, implementing biodiversity policies that encourage ecotonal habitat and urban greening can increase the risk of Lyme borreliosis by increasing suitable habitat for hosts and the tick vectors. However, this can depend on whether deer population management is carried out as part of these conservation activities. Exclusion fencing or culling deer to low densities can decrease tick abundance and Lyme borreliosis risk. As management actions often constitute large-scale perturbation experiments, these hold great potential to understand underlying drivers of tick and pathogen dynamics. We recommend integrating monitoring of ticks and the risk of tick-borne pathogens with conservation management activities. This would help fill knowledge gaps and the production of best practice guidelines to reduce risks. This article is part of the themed issue ‘Conservation, biodiversity and infectious disease: scientific evidence and policy implications’.
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Affiliation(s)
- Caroline Millins
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK .,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK.,School of Veterinary Medicine, University of Glasgow, Glasgow G61 1QH, UK
| | - Lucy Gilbert
- The James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, UK
| | - Jolyon Medlock
- Medical Entomology Group, Emergency Response Department, Public Health England, Salisbury, SP4 0JG, UK.,Health Protection Research Unit in Environment and Health, Porton Down, Salisbury SP4 0JG, UK
| | - Kayleigh Hansford
- Medical Entomology Group, Emergency Response Department, Public Health England, Salisbury, SP4 0JG, UK
| | - Des Ba Thompson
- Scottish Natural Heritage, 231 Corstorphine Road, Edinburgh, EH12 7AT, UK
| | - Roman Biek
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK.,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK
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17
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Europe-Wide Meta-Analysis of Borrelia burgdorferi Sensu Lato Prevalence in Questing Ixodes ricinus Ticks. Appl Environ Microbiol 2017; 83:AEM.00609-17. [PMID: 28550059 DOI: 10.1128/aem.00609-17] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/16/2017] [Indexed: 02/07/2023] Open
Abstract
Lyme borreliosis is the most common zoonotic disease transmitted by ticks in Europe and North America. Despite having multiple tick vectors, the causative agent, Borrelia burgdorferisensu lato, is vectored mainly by Ixodes ricinus in Europe. In the present study, we aimed to review and summarize the existing data published from 2010 to 2016 concerning the prevalence of B. burgdorferi sensu lato spirochetes in questing I. ricinus ticks. The primary focus was to evaluate the infection rate of these bacteria in ticks, accounting for tick stage, adult tick gender, region, and detection method, as well as to investigate any changes in prevalence over time. The data obtained were compared to the findings of a previous metastudy. The literature search identified data from 23 countries, with 115,028 ticks, in total, inspected for infection with B. burgdorferi sensu lato We showed that the infection rate was significantly higher in adults than in nymphs and in females than in males. We found significant differences between European regions, with the highest infection rates in Central Europe. The most common genospecies were B. afzelii and B. garinii, despite a negative correlation of their prevalence rates. No statistically significant differences were found among the prevalence rates determined by conventional PCR, nested PCR, and real-time PCR.IMPORTANCEBorrelia burgdorferisensu lato is a pathogenic bacterium whose clinical manifestations are associated with Lyme borreliosis. This vector-borne disease is a major public health concern in Europe and North America and may lead to severe arthritic, cardiovascular, and neurological complications if left untreated. Although pathogen prevalence is considered an important predictor of infection risk, solitary isolated data have only limited value. Here we provide summarized information about the prevalence of B. burgdorferi sensu lato spirochetes among host-seeking Ixodes ricinus ticks, the principal tick vector of borreliae in Europe. We compare the new results with previously published data in order to evaluate any changing trends in tick infection.
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18
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Millins C, Gilbert L, Johnson P, James M, Kilbride E, Birtles R, Biek R. Heterogeneity in the abundance and distribution of Ixodes ricinus and Borrelia burgdorferi (sensu lato) in Scotland: implications for risk prediction. Parasit Vectors 2016; 9:595. [PMID: 27876087 PMCID: PMC5120507 DOI: 10.1186/s13071-016-1875-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 11/04/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Cases of Lyme borreliosis, a vector-borne zoonosis caused by bacteria in the Borrelia burgdorferi (sensu lato) species group, have increased in recent years in Europe. Knowledge of environmental factors associated with abundance of the tick vector Ixodes ricinus and the pathogen B. burgdorferi (s.l.) is of interest to understand responses to environmental changes, predict variation in risk and to inform management interventions. METHODS Nineteen woodland sites across Scotland were surveyed in 2012 for B. burgdorferi (s.l.) infection in questing I. ricinus nymphs (n = 200 per site), deer abundance and vegetation. Climatic factors were extracted for each site. Six additional sites were surveyed for questing nymphs in both 2012 and 2013 (n = 200 per site and year) to test for variation in B. burgdorferi (s.l.) prevalence between years. RESULTS The mean prevalence of B. burgdorferi (s.l.) across 19 sites was 1.7% (95% CI: 1.4-2.2%; range 0-6%), all four genospecies known to be present in the UK were detected: B. garinii, B. afzelii, B. burgdorferi (sensu stricto) and B. valaisiana. A higher prevalence of B. burgdorferi (s.l.), higher densities of nymphs and higher densities of infected nymphs were found at sites with warmer climates, estimated with growing degree-days. No association between infection prevalence in nymphs and woodland type (semi-natural mixed vs coniferous) or deer density was found. At six sites sampled in 2012 and 2013, there was a significant increase in B. afzelli prevalence at two sites and a decrease in B. garinii prevalence at one site. CONCLUSIONS This study highlights challenges for the prediction of risk of Lyme borreliosis, reflecting the sensitivity of both pathogen and vector ecology to habitat, host and climatic factors. Significant changes in the prevalence of individual genospecies at sites monitored across time are likely to be due to variability in the host community composition between years. Our results indicate the importance of monitoring dynamic variables such as reservoir host populations as well as climate and habitat factors over multiple years, to identify environmental factors associated with Lyme borreliosis risk.
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Affiliation(s)
- Caroline Millins
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland. .,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, Scotland.
| | - Lucy Gilbert
- James Hutton Institute, Craigiebuckler, Aberdeen, Scotland
| | - Paul Johnson
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland.,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, Scotland
| | - Marianne James
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, UK.,Division of Applied Medicine, University of Aberdeen, Aberdeen, UK.,Present Address: Food Standards Scotland, Aberdeen, Scotland
| | - Elizabeth Kilbride
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland
| | - Richard Birtles
- School of Environment and Life Sciences, University of Salford, Salford, UK
| | - Roman Biek
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, Scotland.,The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, Scotland
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19
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Vourc'h G, Abrial D, Bord S, Jacquot M, Masséglia S, Poux V, Pisanu B, Bailly X, Chapuis JL. Mapping human risk of infection with Borrelia burgdorferi sensu lato, the agent of Lyme borreliosis, in a periurban forest in France. Ticks Tick Borne Dis 2016; 7:644-652. [PMID: 26897396 DOI: 10.1016/j.ttbdis.2016.02.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 01/22/2016] [Accepted: 02/05/2016] [Indexed: 12/19/2022]
Abstract
Lyme borreliosis is a major zoonosis in Europe, with estimates of over 26,000 cases per year in France alone. The etiological agents are spirochete bacteria that belong to the Borrelia burgdorferi sensu lato (s. l.) complex and are transmitted by hard ticks among a large range of vertebrate hosts. In Europe, the tick Ixodes ricinus is the main vector. In the absence of a vaccine and given the current difficulties to diagnose and treat chronic Lyme syndromes, there is urgent need for prevention. In this context, accurate information on the spatial patterns of risk of exposure to ticks is of prime importance for public health. The objective of our study was to provide a snapshot map of the risk of human infection with B. burgdorferi s. l. pathogens in a periurban forest at a high resolution, and to analyze the factors that contribute to variation in this risk. Field monitoring took place over three weeks in May 2011 in the suburban Sénart forest (3,200ha; southeast of Paris), which receives over 3 million people annually. We sampled ticks over the entire forest area (from 220 forest stands with a total area of 35,200m(2)) and quantified the density of questing nymphs (DON), the prevalence of infection among nymphs (NIP), and the density of infected nymphs (DIN), which is the most important predictor of the human risk of Lyme borreliosis. For each of these response variables, we explored the relative roles of weather (saturation deficit), hosts (abundance indices of ungulates and Tamias sibiricus, an introduced rodent species), vegetation and forest cover, superficial soil composition, and the distance to forest roads. In total, 19,546 questing nymphs were collected and the presence of B. burgdorferi s. l. was tested in 3,903 nymphs by qPCR. The mean DON was 5.6 nymphs per 10m(2) (standard deviation=10.4) with an average NIP of 10.1% (standard deviation=0.11). The highest DIN was 8.9 infected nymphs per 10m(2), with a mean of 0.59 (standard deviation=0.6). Our mapping and modeling revealed a strong heterogeneity of risk within the forest. The highest risk was found in the eastern part of the forest and localized patches in the northwestern part. Lyme borreliosis risk was positively associated with stands of deciduous trees (mainly oaks) and roe deer abundance. Contrary to expectations, DIN actually increased with distance from the point of introduction of T. sibiricus (i.e., DIN was higher in areas with potentially lower abundances of T. sibiricus). Thus, despite the fact that T. sibiricus is an important reservoir host for B. burgdorferi s. l., our study found that other explanatory factors played a more important role in determining the density of infected ticks. Precise mapping of the risk of exposure to Lyme borreliosis in a highly visited forest represents an important tool for targeting prevention and control measures, as well as making the general public and local health officials aware of the risks.
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Affiliation(s)
- G Vourc'h
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France.
| | - D Abrial
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France
| | - S Bord
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France
| | - M Jacquot
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France
| | - S Masséglia
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France
| | - V Poux
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France
| | - B Pisanu
- MNHN, Centre d'Ecologie et des Sciences de la Conservation (UMR7204), Sorbonne Universités, MNHN, CNRS, UPMC, CP51, 61 rue Buffon, 75231 Paris Cedex 05, France
| | - X Bailly
- INRA, UR0346 Unité d'Epidémiologie Animale, 63122 Saint Genès Champanelle, France
| | - J-L Chapuis
- MNHN, Centre d'Ecologie et des Sciences de la Conservation (UMR7204), Sorbonne Universités, MNHN, CNRS, UPMC, CP51, 61 rue Buffon, 75231 Paris Cedex 05, France
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An Invasive Mammal (the Gray Squirrel, Sciurus carolinensis) Commonly Hosts Diverse and Atypical Genotypes of the Zoonotic Pathogen Borrelia burgdorferi Sensu Lato. Appl Environ Microbiol 2015; 81:4236-45. [PMID: 25888168 PMCID: PMC4475893 DOI: 10.1128/aem.00109-15] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 04/03/2015] [Indexed: 11/29/2022] Open
Abstract
Invasive vertebrate species can act as hosts for endemic pathogens and may alter pathogen community composition and dynamics. For the zoonotic pathogen Borrelia burgdorferisensu lato, the agent of Lyme borreliosis, recent work shows invasive rodent species can be of high epidemiological importance and may support host-specific strains. This study examined the role of gray squirrels (Sciurus carolinensis) (n = 679), an invasive species in the United Kingdom, as B. burgdorferi sensu lato hosts. We found that gray squirrels were frequently infested with Ixodes ricinus, the main vector of B. burgdorferi sensu lato in the United Kingdom, and 11.9% were infected with B. burgdorferi sensu lato. All four genospecies that occur in the United Kingdom were detected in gray squirrels, and unexpectedly, the bird-associated genospecies Borrelia garinii was most common. The second most frequent infection was with Borrelia afzelii. Genotyping of B. garinii and B. afzelii produced no evidence for strains associated with gray squirrels. Generalized linear mixed models (GLMM) identified tick infestation and date of capture as significant factors associated with B. burgdorferi sensu lato infection in gray squirrels, with infection elevated in early summer in squirrels infested with ticks. Invasive gray squirrels appear to become infected with locally circulating strains of B. burgdorferi sensu lato, and further studies are required to determine their role in community disease dynamics. Our findings highlight the fact that the role of introduced host species in B. burgdorferi sensu lato epidemiology can be highly variable and thus difficult to predict.
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Tappe J, Jordan D, Janecek E, Fingerle V, Strube C. Revisited: Borrelia burgdorferi sensu lato infections in hard ticks (Ixodes ricinus) in the city of Hanover (Germany). Parasit Vectors 2014; 7:441. [PMID: 25233844 PMCID: PMC4262061 DOI: 10.1186/1756-3305-7-441] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 08/25/2014] [Indexed: 11/14/2022] Open
Abstract
Background The present study investigated the prevalence of Borrelia burgdorferi sensu lato (s.l.) genospecies in Ixodes ricinus ticks collected in Hanover, Northern Germany, in 2010. At the same time the study served as fifth-year-follow-up study for data comparison with 2005. Methods A total of 2100 questing ticks were collected and analysed by quantitative real-time PCR (qPCR) with subsequent species differentiation via Reverse Line Blot and Sanger sequencing. Simultaneously, results obtained in 2010 were compared to infection rates from 2005 to evaluate the development of B. burgdorferi s.l. infection rates in Hanoverian ticks. Results Overall, 22.7% (476/2,100) of collected ticks were tested positive for B. burgdorferi s.l. infections. Adult ticks showed an infection rate of 33.3% (124/372), subdivided into 29.6% (58/196) positive males and 37.5% (66/176) positive females. Nymph and larvae infection rates were found to be 20.3% (344/1,697) and 25.8% (8/31), respectively. Species identification was successful for 59.2% (282/476) of positive ticks with B. afzelii as the most frequently detected genospecies, followed by B. garinii (including B. bavariensis) and B. spielmanii. B. burgdorferi sensu stricto (s.s.), B. bissettii, B. valaisiana and B. lusitaniae were also identified. Significant differences concerning seasonal fluctuations as well as local differences were observed. Comparing infection rates of Hanoverian ticks between years, a significant increase (P = 0.002) could be observed for larvae with 1.7% positives (2/60) in 2005 and 25.8% positives (8/31) in 2010. In the latter year, coinfections with Borrelia and Rickettsiales were detected in a total of 7.8% (163/2,100) of collected ticks. Of these, 7.3% (153/2,100) were coinfected with Rickettsia spp., 0.3% (7/2,100) with A. phagocytophilum and 0.1% (3/2,100) were coinfected with all three pathogens. Between years 2005 and 2010, no statistically significant differences in coinfection rates were found. Conclusions Comparing B. burgdorferi s.l. infections in Hanoverian I. ricinus ticks in 2010 with data from 2005, a statistically significant increase of infected larvae was noted, whereas the other stages revealed no statistically significant differences. Whether the increased larvae infection rate is an isolated event or results from factual circumstances, e.g. increasing effectiveness of transovarial transmission due to unknown factors, has to be evaluated in further studies.
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Affiliation(s)
| | | | | | | | - Christina Strube
- Institute for Parasitology, University of Veterinary Medicine, Buenteweg 17, 30559 Hannover, Germany.
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Abstract
This paper reports the first detection of Borrelia miyamotoi in UK Ixodes ricinus ticks. It also reports on the presence and infection rates of I. ricinus for a number of other tick-borne pathogens of public health importance. Ticks from seven regions in southern England were screened for B. miyamotoi, Borrelia burgdorferi sensu lato (s.l.), Anaplasma phagocytophilum and Neoehrlichia mikurensis using qPCR. A total of 954 I. ricinus ticks were tested, 40 were positive for B. burgdorferi s.l., 22 positive for A. phagocytophilum and three positive for B. miyamotoi, with no N. mikurensis detected. The three positive B. miyamotoi ticks came from three geographically distinct areas, suggesting a widespread distribution, and from two separate years, suggesting some degree of endemicity. Understanding the prevalence of Borrelia and other tick-borne pathogens in ticks is crucial for locating high-risk areas of disease transmission.
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