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Coates SJ, Norton SA. The effects of climate change on infectious diseases with cutaneous manifestations. Int J Womens Dermatol 2020; 7:8-16. [PMID: 32838014 PMCID: PMC7373693 DOI: 10.1016/j.ijwd.2020.07.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 07/11/2020] [Accepted: 07/15/2020] [Indexed: 12/11/2022] Open
Abstract
Background Anthropogenic climate change affects the burden of infectious diseases via several interconnected mechanisms. In recent years, there has been greater awareness of the ways in which climate-sensitive infectious diseases pose a growing threat to global public health. Objective This study aimed to categorize and describe the effects of climate change on infectious diseases with skin manifestations. Methods A scoping review of the MEDLINE and PubMed online databases for climate-sensitive infections was performed in February and March 2020. A representative selection of conditions with skin manifestations was included in this review. Results Several representative climate-sensitive infectious diseases were identified in each of the following categories: vector-borne infectious diseases, infectious diseases associated with extreme weather events, and infectious diseases linked to human migration. Conclusion Climate variables directly influence the survival and reproduction of infectious microorganisms, their vectors, and their animal reservoirs. Due to sustained warmer temperatures at higher latitudes, climate change has expanded the geographic range of certain pathogenic microbes. More frequent climate change-related extreme weather events create circumstances where existing infectious microorganisms flourish and novel infections emerge. Climate instability is linked to increased human migration, which disrupts health care infrastructure as well as the habitats of microbes, vectors, and animal reservoirs and leads to widespread poverty and overcrowding. Dermatologists should understand that climate change will affect the burden and geographic distribution of infectious diseases, many of which have cutaneous signs and might be encountered in their regular practice.
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Affiliation(s)
- Sarah J Coates
- Department of Dermatology, University of California, San Francisco, San Francisco, CA, United States
| | - Scott A Norton
- Dermatology and Pediatrics, The George Washington University School of Medicine and Health Sciences, Washington, D.C., United States
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El-Sayed A, Kamel M. Climatic changes and their role in emergence and re-emergence of diseases. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:22336-22352. [PMID: 32347486 PMCID: PMC7187803 DOI: 10.1007/s11356-020-08896-w] [Citation(s) in RCA: 135] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 04/14/2020] [Indexed: 05/11/2023]
Abstract
Global warming and the associated climate changes are predictable. They are enhanced by burning of fossil fuels and the emission of huge amounts of CO2 gas which resulted in greenhouse effect. It is expected that the average global temperature will increase with 2-5 °C in the next decades. As a result, the earth will exhibit marked climatic changes characterized by extremer weather events in the coming decades, such as the increase in temperature, rainfall, summertime, droughts, more frequent and stronger tornadoes and hurricanes. Epidemiological disease cycle includes host, pathogen and in certain cases intermediate host/vector. A complex mixture of various environmental conditions (e.g. temperature and humidity) determines the suitable habitat/ecological niche for every vector host. The availability of suitable vectors is a precondition for the emergence of vector-borne pathogens. Climate changes and global warming will have catastrophic effects on human, animal and environmental ecosystems. Pathogens, especially neglected tropical disease agents, are expected to emerge and re-emerge in several countries including Europe and North America. The lives of millions of people especially in developing countries will be at risk in direct and indirect ways. In the present review, the role of climate changes in the spread of infectious agents and their vectors is discussed. Examples of the major emerging viral, bacterial and parasitic diseases are also summarized.
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Affiliation(s)
- Amr El-Sayed
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Mohamed Kamel
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt.
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Wallenhammar A, Lindqvist R, Asghar N, Gunaltay S, Fredlund H, Davidsson Å, Andersson S, Överby AK, Johansson M. Revealing new tick-borne encephalitis virus foci by screening antibodies in sheep milk. Parasit Vectors 2020; 13:185. [PMID: 32268924 PMCID: PMC7140392 DOI: 10.1186/s13071-020-04030-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 03/24/2020] [Indexed: 12/30/2022] Open
Abstract
Background Tick distribution in Sweden has increased in recent years, with the prevalence of ticks predicted to spread towards the northern parts of the country, thus increasing the risk of tick-borne zoonoses in new regions. Tick-borne encephalitis (TBE) is the most significant viral tick-borne zoonotic disease in Europe. The disease is caused by TBE virus (TBEV) infection which often leads to severe encephalitis and myelitis in humans. TBEV is usually transmitted to humans via tick bites; however, the virus can also be excreted in the milk of goats, sheep and cattle and infection may then occur via consumption of unpasteurised dairy products. Virus prevalence in questing ticks is an unreliable indicator of TBE infection risk as viral RNA is rarely detected even in large sample sizes collected at TBE-endemic areas. Hence, there is a need for robust surveillance techniques to identify emerging TBEV risk areas at early stages. Methods Milk and colostrum samples were collected from sheep and goats in Örebro County, Sweden. The milk samples were analysed for the presence of TBEV antibodies by ELISA and validated by western blot in which milk samples were used to detect over-expressed TBEV E-protein in crude cell extracts. Neutralising titers were determined by focus reduction neutralisation test (FRNT). The stability of TBEV in milk and colostrum was studied at different temperatures. Results In this study we have developed a novel strategy to identify new TBEV foci. By monitoring TBEV antibodies in milk, we have identified three previously unknown foci in Örebro County which also overlap with areas of TBE infection reported during 2009–2018. In addition, our data indicates that keeping unpasteurised milk at 4 °C will preserve the infectivity of TBEV for several days. Conclusions Altogether, we report a non-invasive surveillance technique for revealing risk areas for TBE in Sweden, by detecting TBEV antibodies in sheep milk. This approach is robust and reliable and can accordingly be used to map TBEV “hotspots”. TBEV infectivity in refrigerated milk was preserved, emphasising the importance of pasteurisation (i.e. 72 °C for 15 s) prior to consumption.![]()
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Affiliation(s)
- Amélie Wallenhammar
- School of Medical Sciences, Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Richard Lindqvist
- Department of Clinical Microbiology, Virology, Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, Umeå, Sweden
| | - Naveed Asghar
- School of Medical Sciences, Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Sezin Gunaltay
- School of Medical Sciences, Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, Örebro, Sweden.,Lydia Becker Institiute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Hans Fredlund
- Department of Laboratory Medicine, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Åke Davidsson
- School of Medical Sciences, Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Sören Andersson
- School of Medical Sciences, Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Anna K Överby
- Department of Clinical Microbiology, Virology, Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, Umeå, Sweden
| | - Magnus Johansson
- School of Medical Sciences, Inflammatory Response and Infection Susceptibility Centre (iRiSC), Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
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Kryda K, Mahabir SP, Chapin S, Holzmer SJ, Bowersock L, Everett WR, Riner J, Carter L, Young D. Efficacy of a novel orally administered combination product containing sarolaner, moxidectin and pyrantel (Simparica Trio™) against induced infestations of five common tick species infesting dogs in the USA. Parasit Vectors 2020; 13:77. [PMID: 32113476 PMCID: PMC7049397 DOI: 10.1186/s13071-020-3945-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 02/04/2020] [Indexed: 01/23/2023] Open
Abstract
Background The efficacy of a novel oral combination product, Simparica Trio™, containing sarolaner, moxidectin and pyrantel was evaluated against five tick species that commonly infest dogs in the USA, Amblyomma americanum, Amblyomma maculatum, Dermacentor variabilis, Ixodes scapularis and Rhipicephalus sanguineus. Methods Laboratory studies were conducted against two different strains of each tick species. In each study, 10 purpose-bred Beagle or mixed-breed dogs were randomly allocated to one of two treatment groups based on pre-treatment host-suitability tick counts. Dogs were infested with approximately 50 (45–55) unfed adult ticks on Days -2, 5, 12, 19, 26 and 33. On Day 0, dogs received either a single oral dose of Simparica Trio™ at the minimum label dose of 1.2 mg/kg sarolaner, 24 µg/kg moxidectin and 5 mg/kg pyrantel (as pamoate salt) or placebo. Tick counts were conducted at 48 h post-treatment and after each subsequent weekly re-infestation for A. maculatum, D. variabilis, I. scapularis and R. sanguineus studies and at 48 hours or at 72 h post-treatment and after weekly re-infestation in the first and second A. americanum studies, respectively. Results No treatment-related adverse reactions occurred in any study. In all studies, placebo-treated dogs maintained infestations throughout the entire study duration, and dogs treated with Simparica Trio™ had significantly lower (P ≤ 0.0010) mean live tick counts than placebo-treated dogs at all time-points. Against A. maculatum, D. variabilis, I. scapularis and R. sanguineus, a single oral dose of Simparica Trio™ evaluated at 48 h post-treatment provided ≥ 98.9% efficacy against existing infestations, and within 48 h of re-infestation efficacy was ≥ 90.4% through at least Day 28 (except for R. sanguineus on Day 14 in a single study with an efficacy of 89.7%). Against A. americanum, Simparica Trio™ provided ≥ 99.4% efficacy at ≤ 72 h after treatment of existing infestations and maintained ≥ 98.4% efficacy at ≤ 72 h after re-infestation through at least Day 35. Conclusions A single dose of Simparica Trio™ administered orally at the minimum label dosage of 1.2 mg/kg sarolaner, 24 µg/kg moxidectin and 5 mg/kg pyrantel provided treatment and control of the common tick species infesting dogs in the USA for at least one month.
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Affiliation(s)
- Kristina Kryda
- Zoetis, Veterinary Medicine Research and Development, 333 Portage Street, Kalamazoo, MI, 49007, USA.
| | - Sean P Mahabir
- Zoetis, Veterinary Medicine Research and Development, 333 Portage Street, Kalamazoo, MI, 49007, USA
| | - Sara Chapin
- Zoetis, Veterinary Medicine Research and Development, 333 Portage Street, Kalamazoo, MI, 49007, USA
| | - Susan J Holzmer
- Zoetis, Veterinary Medicine Research and Development, 333 Portage Street, Kalamazoo, MI, 49007, USA
| | - Laurel Bowersock
- Zoetis, Veterinary Medicine Research and Development, 333 Portage Street, Kalamazoo, MI, 49007, USA
| | | | - John Riner
- Animal Health Innovations, Route 1, Box 435, Nowata, OK, 74048, USA
| | - Lori Carter
- Stillmeadow, Inc., 12852 Park One Drive, Sugar Land, TX, 77478, USA
| | - David Young
- Young Veterinary Research Services, Inc., 7243 East Avenue, Turlock, CA, 95389, USA
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Azagi T, Hoornstra D, Kremer K, Hovius JWR, Sprong H. Evaluation of Disease Causality of Rare Ixodes ricinus-Borne Infections in Europe. Pathogens 2020; 9:pathogens9020150. [PMID: 32102367 PMCID: PMC7168666 DOI: 10.3390/pathogens9020150] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 02/21/2020] [Accepted: 02/21/2020] [Indexed: 12/13/2022] Open
Abstract
In Europe, Ixodes ricinus ticks transmit pathogens such as Borrelia burgdorferi sensu lato and tick-borne encephalitis virus (TBEV). In addition, there is evidence for transmission to humans from I. ricinus of Anaplasma phagocytophilum, Babesia divergens, Babesia microti, Babesia venatorum, Borrelia miyamotoi, Neoehrlichia mikurensis, Rickettsia helvetica and Rickettsia monacensis. However, whether infection with these potential tick-borne pathogens results in human disease has not been fully demonstrated for all of these tick-borne microorganisms. To evaluate the available evidence for a causative relation between infection and disease, the current study analyses European case reports published from 2008 to 2018, supplemented with information derived from epidemiological and experimental studies. The evidence for human disease causality in Europe found in this review appeared to be strongest for A. phagocytophilum and B. divergens. Nonetheless, some knowledge gaps still exist. Importantly, comprehensive evidence for pathogenicity is lacking for the remaining tick-borne microorganisms. Such evidence could be gathered best through prospective studies, for example, studies enrolling patients with a fever after a tick bite, the development of specific new serological tools, isolation of these microorganisms from ticks and patients and propagation in vitro, and through experimental studies.
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Affiliation(s)
- Tal Azagi
- Centre for Infectious Diseases Research, National Institute for Public Health and the Environment, P.O. Box 1, Bilthoven 3720 BA, The Netherlands; (K.K.); (H.S.)
- Correspondence:
| | - Dieuwertje Hoornstra
- Center for Experimental and Molecular Medicine, Amsterdam University Medical Centers Location Academic Medical Center, Amsterdam 1105 AZ, The Netherlands; (D.H.); (J.W.R.H.)
| | - Kristin Kremer
- Centre for Infectious Diseases Research, National Institute for Public Health and the Environment, P.O. Box 1, Bilthoven 3720 BA, The Netherlands; (K.K.); (H.S.)
| | - Joppe W. R. Hovius
- Center for Experimental and Molecular Medicine, Amsterdam University Medical Centers Location Academic Medical Center, Amsterdam 1105 AZ, The Netherlands; (D.H.); (J.W.R.H.)
| | - Hein Sprong
- Centre for Infectious Diseases Research, National Institute for Public Health and the Environment, P.O. Box 1, Bilthoven 3720 BA, The Netherlands; (K.K.); (H.S.)
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Deviatkin AA, Kholodilov IS, Vakulenko YA, Karganova GG, Lukashev AN. Tick-Borne Encephalitis Virus: An Emerging Ancient Zoonosis? Viruses 2020; 12:v12020247. [PMID: 32102228 PMCID: PMC7077300 DOI: 10.3390/v12020247] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 02/10/2020] [Accepted: 02/19/2020] [Indexed: 12/19/2022] Open
Abstract
Tick-borne encephalitis (TBE) is one of the most important viral zoonosis transmitted by the bite of infected ticks. In this study, all tick-borne encephalitis virus (TBEV) E gene sequences available in GenBank as of June 2019 with known date of isolation (n = 551) were analyzed. Simulation studies showed that a sample bias could significantly affect earlier studies, because small TBEV datasets (n = 50) produced non-overlapping intervals for evolutionary rate estimates. An apparent lack of a temporal signal in TBEV, in general, was found, precluding molecular clock analysis of all TBEV subtypes in one dataset. Within all subtypes and most of the smaller groups in these subtypes, there was evidence of many medium- and long-distance virus transfers. These multiple random events may play a key role in the virus spreading. For some groups, virus diversity within one territory was similar to diversity over the whole geographic range. This is best exemplified by the virus diversity observed in Switzerland or Czech Republic. These two countries yielded most of the known European subtype Eu3 subgroup sequences, and the diversity of viruses found within each of these small countries is comparable to that of the whole Eu3 subgroup, which is prevalent all over Central and Eastern Europe. Most of the deep tree nodes within all three established TBEV subtypes dated less than 300 years back. This could be explained by the recent emergence of most of the known TBEV diversity. Results of bioinformatics analysis presented here, together with multiple field findings, suggest that TBEV may be regarded as an emerging disease.
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Affiliation(s)
- Andrei A. Deviatkin
- Laboratory of Molecular Biology and Biochemistry, Institute of Molecular Medicine, Sechenov First Moscow State Medical University, 119048 Moscow, Russia;
- Laboratory of Postgenomic Technologies, Izmerov Research Institute of Occupational Health, 105275 Moscow, Russia
- Correspondence: ; Tel.: +7-906-739-0860
| | - Ivan S. Kholodilov
- Laboratory of Biology of Arboviruses, Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI “Chumakov FSC R&D IBP RAS), 108819 Moscow, Russia; (I.S.K.); (G.G.K.)
| | - Yulia A. Vakulenko
- Martsinovsky Institute of Medical Parasitology, Tropical and Vector Borne Diseases, Sechenov First Moscow State Medical University, 119435 Moscow, Russia;
- Department of Virology, Faculty of Biology, Lomonosov Moscow State University, 119234 Moscow, Russia
| | - Galina G. Karganova
- Laboratory of Biology of Arboviruses, Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI “Chumakov FSC R&D IBP RAS), 108819 Moscow, Russia; (I.S.K.); (G.G.K.)
- Department of Organization and Technology of Immunobiological Preparations, Institute for Translational Medicine and Biotechnology, Sechenov First Moscow State Medical University, 119991 Moscow, Russia
| | - Alexander N. Lukashev
- Laboratory of Molecular Biology and Biochemistry, Institute of Molecular Medicine, Sechenov First Moscow State Medical University, 119048 Moscow, Russia;
- Martsinovsky Institute of Medical Parasitology, Tropical and Vector Borne Diseases, Sechenov First Moscow State Medical University, 119435 Moscow, Russia;
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Zubriková D, Wittmann M, Hönig V, Švec P, Víchová B, Essbauer S, Dobler G, Grubhoffer L, Pfister K. Prevalence of tick-borne encephalitis virus and Borrelia burgdorferi sensu lato in Ixodes ricinus ticks in Lower Bavaria and Upper Palatinate, Germany. Ticks Tick Borne Dis 2020; 11:101375. [PMID: 31983627 DOI: 10.1016/j.ttbdis.2020.101375] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 01/10/2020] [Accepted: 01/14/2020] [Indexed: 12/14/2022]
Abstract
Lyme borreliosis and tick-borne encephalitis (TBE) are the most common tick-borne diseases in Germany. We collected Ixodes ricinus ticks from 16 high-risk and four low-risk sites distributed in Lower Bavaria and Upper Palatinate based on the number of human TBE cases recorded at the Robert Koch Institute from 2001 to 2009. A total of 8805 questing ticks (8203 nymphs, 602 adults) were collected in 2010 and examined in pools for the presence of tick-borne encephalitis virus (TBEV) using real-time RT-PCR. Overall TBEV prevalence evaluated as the minimum infection rate (MIR) was 0.26 % (23 positive pools/8805 ticks in 1029 pools). TBEV was detected at seven of the 16 high-risk sites, where MIR ranged from 0.16 to 2.86 %. A total of 3969 ticks were examined by PCR for infection with Borrelia burgdorferi sensu lato (s.l.) targeting the 5 S-23 S rRNA intergenic spacer (IGS) region. IGS nucleotide sequences were used to determine genospecies. Selected positive Borrelia samples were subjected to PCR and sequencing targeting the OspA gene, providing 46 sequences for molecular phylogenetic analysis. Of the 3969 questing ticks, 506 (12.7 %) were positive for B. burgdorferi s.l. Seven B. burgdorferi s.l. genospecies were identified: B. afzelii (41.3 %), B. garinii (19 %), B. valaisiana (13.8 %), B. burgdorferi sensu stricto (11.1 %), B. spielmanii (0.4 %), B. lusitaniae (0.2 %), and Candidatus B. finlandensis (0.6 %). Mixed infections were identified in 13.6 % of the ticks. The rate of infection in questing ticks varied among sites from 5.6 % (72 examined, four positive) to 29.5 % (88 examined, 26 positive). B. burgdorferi s.l. occurred at all 20 sites, whereas TBEV was detected only at the high-risk sites where more human TBE cases were reported compared to low-risk sites.
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Affiliation(s)
- Dana Zubriková
- Department of Veterinary Sciences, Experimental Parasitology, Ludwig-Maximilians-University Munich, Munich, Germany.
| | - Maria Wittmann
- Department of Veterinary Sciences, Experimental Parasitology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Václav Hönig
- Biology Centre AS CR, Institute of Parasitology & University of South Bohemia, Faculty of Science, Ceske Budejovice, Czech Republic; Veterinary Research Institute, Brno, Czech Republic
| | - Pavel Švec
- Department of Geoinformatics, VSB - Technical University of Ostrava, Ostrava-Poruba, Czech Republic
| | - Bronislava Víchová
- Institute of Parasitology of the Slovak Academy of Sciences, Košice, Slovak Republic
| | - Sandra Essbauer
- Bundeswehr Institute of Microbiology, German Center of Infection Research DZIF Partner, Munich, Bavaria, Germany
| | - Gerhard Dobler
- Bundeswehr Institute of Microbiology, German Center of Infection Research DZIF Partner, Munich, Bavaria, Germany
| | - Libor Grubhoffer
- Biology Centre AS CR, Institute of Parasitology & University of South Bohemia, Faculty of Science, Ceske Budejovice, Czech Republic
| | - Kurt Pfister
- Department of Veterinary Sciences, Experimental Parasitology, Ludwig-Maximilians-University Munich, Munich, Germany
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Paulsen KM, das Neves CG, Granquist EG, Madslien K, Stuen S, Pedersen BN, Vikse R, Rocchi M, Laming E, Stiasny K, Andreassen ÅK. Cervids as sentinel-species for tick-borne encephalitis virus in Norway - A serological study. Zoonoses Public Health 2019; 67:342-351. [PMID: 31855321 DOI: 10.1111/zph.12675] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 11/19/2019] [Accepted: 11/24/2019] [Indexed: 12/19/2022]
Abstract
Tick-borne encephalitis virus (TBEV) is the causative agent of tick-borne encephalitis (TBE). TBEV is one of the most important neurological pathogens transmitted by tick bites in Europe. The objectives of this study were to investigate the seroprevalence of TBE antibodies in cervids in Norway and the possible emergence of new foci, and furthermore to evaluate if cervids can function as sentinel animals for the distribution of TBEV in the country. Serum samples from 286 moose, 148 roe deer, 140 red deer and 83 reindeer from all over Norway were collected and screened for TBE immunoglobulin G (IgG) antibodies with a modified commercial enzyme-linked immunosorbent assay (ELISA) and confirmed by TBEV serum neutralisation test (SNT). The overall seroprevalence against the TBEV complex in the cervid specimens from Norway was 4.6%. The highest number of seropositive cervids was found in south-eastern Norway, but seropositive cervids were also detected in southern- and central Norway. Antibodies against TBEV detected by SNT were present in 9.4% of the moose samples, 1.4% in red deer, 0.7% in roe deer, and nil in reindeer. The majority of the positive samples in our study originated from areas where human cases of TBE have been reported in Norway. The study is the first comprehensive screening of cervid species in Norway for antibodies to TBEV, and shows that cervids are useful sentinel animals to indicate TBEV occurrence, as supplement to studies in ticks. Furthermore, the results indicate that TBEV might be spreading northwards in Norway. This information may be of relevance for public health considerations and supports previous findings of TBEV in ticks in Norway.
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Affiliation(s)
- Katrine M Paulsen
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway.,Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | | | - Erik G Granquist
- Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | | | - Snorre Stuen
- Department of Production Animal Clinical Sciences, Section of Small Ruminant Research and Herd Health, Norwegian University of Life Sciences, Sandnes, Norway
| | - Benedikte N Pedersen
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway.,Department of Natural Science and Environmental Health, University of South-Eastern Norway, Bø, Norway
| | - Rose Vikse
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Mara Rocchi
- Virus Surveillance Unit, Moredun Research Institute, Penicuik, Scotland, UK
| | - Ellie Laming
- Virus Surveillance Unit, Moredun Research Institute, Penicuik, Scotland, UK
| | - Karin Stiasny
- Center for Virology, Medical University of Vienna, Vienna, Austria
| | - Åshild K Andreassen
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
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Paulsen KM, Granquist EG, Okstad W, Vikse R, Stiasny K, Andreassen ÅK, Stuen S. Experimental infection of lambs with tick-borne encephalitis virus and co-infection with Anaplasma phagocytophilum. PLoS One 2019; 14:e0226836. [PMID: 31856227 PMCID: PMC6922421 DOI: 10.1371/journal.pone.0226836] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 12/05/2019] [Indexed: 12/16/2022] Open
Abstract
Tick-borne encephalitis virus (TBEV) is a zoonotic pathogen which may cause tick-borne encephalitis (TBE) in humans and animals. More than 10,000 cases of TBE are reported annually in Europe and Asia. However, the knowledge on TBE in animals is limited. Co-infection with Anaplasma phagocytophilum and louping ill virus (LIV), a close relative to TBEV, in sheep has been found to cause more severe disease than single LIV or A. phagocytophilum infection. The aim of this study was to investigate TBEV infection and co-infection of TBEV and A. phagocytophilum in lambs. A total of 30 lambs, aged five to six months, were used. The experiment was divided into two. In part one, pre- and post-infection of TBEV and A. phagocytophilum was investigated (group 1 to 4), while in part two, co-infection of TBEV and A. phagocytophilum was investigated (group 5 and 6). Blood samples were drawn, and rectal temperature was measured daily. Lambs inoculated with TBEV displayed no clinical symptoms, but had a short or non-detectable viremia by reverse transcription real-time PCR. All lambs inoculated with TBEV developed neutralizing TBEV antibodies. Our study is in accordance with previous studies, and indicates that TBEV rarely causes symptomatic disease in ruminants. All lambs inoculated with A. phagocytophilum developed fever and clinical symptoms of tick-borne fever, and A. phagocytophilum was present in the blood samples of all infected lambs, shown by qPCR. Significantly higher mean TBEV titer was detected in the group co-infected with TBEV and A. phagocytophilum, compared to the groups pre- or post-infected with A. phagocytophilum. These results indicate that co-infection with TBEV and A. phagocytophilum in sheep stimulates an increased TBEV antibody response.
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Affiliation(s)
- Katrine M. Paulsen
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
- Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
- * E-mail: ,
| | - Erik G. Granquist
- Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Wenche Okstad
- Section of Small Ruminant Research and Herd Health, Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Sandnes, Norway
| | - Rose Vikse
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Karin Stiasny
- Center for Virology, Medical University of Vienna, Vienna, Austria
| | - Åshild K. Andreassen
- Department of Virology, Division for Infection Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Snorre Stuen
- Section of Small Ruminant Research and Herd Health, Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Sandnes, Norway
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Binder F, Lenk M, Weber S, Stoek F, Dill V, Reiche S, Riebe R, Wernike K, Hoffmann D, Ziegler U, Adler H, Essbauer S, Ulrich RG. Common vole (Microtus arvalis) and bank vole (Myodes glareolus) derived permanent cell lines differ in their susceptibility and replication kinetics of animal and zoonotic viruses. J Virol Methods 2019; 274:113729. [PMID: 31513859 DOI: 10.1016/j.jviromet.2019.113729] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 08/15/2019] [Accepted: 09/07/2019] [Indexed: 11/16/2022]
Abstract
Pathogenesis and reservoir host adaptation of animal and zoonotic viruses are poorly understood due to missing adequate cell culture and animal models. The bank vole (Myodes glareolus) and common vole (Microtus arvalis) serve as hosts for a variety of zoonotic pathogens. For a better understanding of virus association to a putative animal host, we generated two novel cell lines from bank voles of different evolutionary lineages and two common vole cell lines and assayed their susceptibility, replication and cytopathogenic effect (CPE) formation for rodent-borne, suspected to be rodent-associated or viruses with no obvious rodent association. Already established bank vole cell line BVK168, used as control, was susceptible to almost all viruses tested and efficiently produced infectious virus for almost all of them. The Puumala orthohantavirus strain Vranica/Hällnäs showed efficient replication in a new bank vole kidney cell line, but not in the other four bank and common vole cell lines. Tula orthohantavirus replicated in the kidney cell line of common voles, but was hampered in its replication in the other cell lines. Several zoonotic viruses, such as Cowpox virus, Vaccinia virus, Rift Valley fever virus, and Encephalomyocarditis virus 1 replicated in all cell lines with CPE formation. West Nile virus, Usutu virus, Sindbis virus and Tick-borne encephalitis virus replicated only in a part of the cell lines, perhaps indicating cell line specific factors involved in replication. Rodent specific viruses differed in their replication potential: Murine gammaherpesvirus-68 replicated in the four tested vole cell lines, whereas murine norovirus failed to infect almost all cell lines. Schmallenberg virus and Foot-and-mouth disease virus replicated in some of the cell lines, although these viruses have never been associated to rodents. In conclusion, these newly developed cell lines may represent useful tools to study virus-cell interactions and to identify and characterize host cell factors involved in replication of rodent associated viruses.
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Affiliation(s)
- Florian Binder
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Novel and Emerging Infectious Diseases, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| | - Matthias Lenk
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Department of Experimental Animal Facilities and Biorisk Management, Bio-Bank, Collection of Cell Lines in Veterinary Virology (CCLV), Südufer 10, 17493, Greifswald - Insel Riems, Germany
| | - Saskia Weber
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Diagnostic Virology, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| | - Franziska Stoek
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Novel and Emerging Infectious Diseases, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| | - Veronika Dill
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Diagnostic Virology, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| | - Sven Reiche
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Department of Experimental Animal Facilities and Biorisk Management, Bio-Bank, Collection of Cell Lines in Veterinary Virology (CCLV), Südufer 10, 17493, Greifswald - Insel Riems, Germany
| | - Roland Riebe
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Department of Experimental Animal Facilities and Biorisk Management, Bio-Bank, Collection of Cell Lines in Veterinary Virology (CCLV), Südufer 10, 17493, Greifswald - Insel Riems, Germany
| | - Kerstin Wernike
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Diagnostic Virology, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| | - Donata Hoffmann
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Diagnostic Virology, Südufer 10, 17493 Greifswald - Insel Riems, Germany
| | - Ute Ziegler
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Novel and Emerging Infectious Diseases, Südufer 10, 17493 Greifswald - Insel Riems, Germany; German Center for Infection Research (DZIF), Partner site Hamburg-Lübeck-Borstel-Insel Riems, Germany
| | - Heiko Adler
- Comprehensive Pneumology Center, Research Unit Lung Repair and Regeneration, Helmholtz Zentrum München - German Research Center for Environmental Health (GmbH), Marchioninistrasse 25, 81377 Munich, Germany; University Hospital Grosshadern, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Sandra Essbauer
- Bundeswehr Institute of Microbiology, Department Virology and Rickettsiology, Neuherbergstr. 11, 80937 Munich, Germany
| | - Rainer G Ulrich
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Novel and Emerging Infectious Diseases, Südufer 10, 17493 Greifswald - Insel Riems, Germany; German Center for Infection Research (DZIF), Partner site Hamburg-Lübeck-Borstel-Insel Riems, Germany.
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61
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Smura T, Tonteri E, Jääskeläinen A, von Troil G, Kuivanen S, Huitu O, Kareinen L, Uusitalo J, Uusitalo R, Hannila-Handelberg T, Voutilainen L, Nikkari S, Sironen T, Sane J, Castrén J, Vapalahti O. Recent establishment of tick-borne encephalitis foci with distinct viral lineages in the Helsinki area, Finland. Emerg Microbes Infect 2019; 8:675-683. [PMID: 31084456 PMCID: PMC6522972 DOI: 10.1080/22221751.2019.1612279] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Number of tick-borne encephalitis (TBE) cases has increased and new foci have emerged in Finland during the last decade. We evaluated risk for locally acquired TBE in the capital region inhabited by 1.2 million people. We screened ticks and small mammals from probable places of TBE virus (TBEV) transmission and places without reported circulation. The TBEV positive samples were sequenced and subjected to phylogenetic analysis. Within the study period 2007–2017, there was a clear increase of both all TBE cases and locally acquired cases in the Helsinki area. The surveillance of ticks and small mammals for TBEV confirmed four distinct TBEV foci in the Helsinki area. All detected TBEV strains were of the European subtype. TBEV genome sequences indicated that distinct TBEV lineages circulate in each focus. Molecular clock analysis suggested that the virus lineages were introduced to these foci decades ago. In conclusion, TBE has emerged in the mainland of Helsinki area during the last decade, with at least four distinct virus lineages independently introduced into the region previously. Although the overall annual TBE incidence is below the threshold for recommending general vaccinations, the situation requires further surveillance to detect and prevent possible further emergence of local TBE clusters.
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Affiliation(s)
- Teemu Smura
- a Department of Virology , University of Helsinki , Helsinki , Finland.,b Division of Clinical Microbiology , Helsinki University Hospital Laboratory Services (HUSLAB) , Helsinki , Finland
| | - Elina Tonteri
- c Centers for Military Medicine and Biothreat Preparedness , Helsinki , Finland
| | - Anu Jääskeläinen
- b Division of Clinical Microbiology , Helsinki University Hospital Laboratory Services (HUSLAB) , Helsinki , Finland
| | | | - Suvi Kuivanen
- a Department of Virology , University of Helsinki , Helsinki , Finland
| | - Otso Huitu
- e Natural Resources Institute Finland (Luke) , Helsinki , Finland
| | - Lauri Kareinen
- a Department of Virology , University of Helsinki , Helsinki , Finland
| | - Joni Uusitalo
- a Department of Virology , University of Helsinki , Helsinki , Finland
| | - Ruut Uusitalo
- a Department of Virology , University of Helsinki , Helsinki , Finland.,f Department of Geosciences and Geography , University of Helsinki , Helsinki , Finland.,g Department of Veterinary Biosciences , University of Helsinki , Helsinki , Finland
| | | | - Liina Voutilainen
- c Centers for Military Medicine and Biothreat Preparedness , Helsinki , Finland
| | - Simo Nikkari
- c Centers for Military Medicine and Biothreat Preparedness , Helsinki , Finland
| | - Tarja Sironen
- a Department of Virology , University of Helsinki , Helsinki , Finland
| | - Jussi Sane
- h Department of Health Security, Infectious Disease Control and Vaccinations Unit , National Institute for Health and Welfare , Helsinki , Finland
| | | | - Olli Vapalahti
- a Department of Virology , University of Helsinki , Helsinki , Finland.,b Division of Clinical Microbiology , Helsinki University Hospital Laboratory Services (HUSLAB) , Helsinki , Finland.,g Department of Veterinary Biosciences , University of Helsinki , Helsinki , Finland
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62
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Rizzoli A, Tagliapietra V, Cagnacci F, Marini G, Arnoldi D, Rosso F, Rosà R. Parasites and wildlife in a changing world: The vector-host- pathogen interaction as a learning case. Int J Parasitol Parasites Wildl 2019; 9:394-401. [PMID: 31341772 PMCID: PMC6630057 DOI: 10.1016/j.ijppaw.2019.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 02/06/2023]
Abstract
In the Anthropocene context, changes in climate, land use and biodiversity are considered among the most important anthropogenic factors affecting parasites-host interaction and wildlife zoonotic diseases emergence. Transmission of vector borne pathogens are particularly sensitive to these changes due to the complexity of their cycle, where the transmission of a microparasite depends on the interaction between its vector, usually a macroparasite, and its reservoir host, in many cases represented by a wildlife vertebrate. The scope of this paper focuses on the effect of some major, fast-occurring anthropogenic changes on the vectorial capacity for tick and mosquito borne pathogens. Specifically, we review and present the latest advances regarding two emerging vector-borne viruses in Europe: Tick-borne encephalitis virus (TBEV) and West Nile virus (WNV). In both cases, variation in vector to host ratio is critical in determining the intensity of pathogen transmission and consequently infection hazard for humans. Forecasting vector-borne disease hazard under the global change scenarios is particularly challenging, requiring long term studies based on a multidisciplinary approach in a One-Health framework.
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Affiliation(s)
- Annapaola Rizzoli
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
| | - Valentina Tagliapietra
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
| | - Francesca Cagnacci
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
| | - Giovanni Marini
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
| | - Daniele Arnoldi
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
| | - Fausta Rosso
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
| | - Roberto Rosà
- Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38010, San Michele all’Adige, Trento, Italy
- Centre Agriculture Food Environment, University of Trento, San Michele all’Adige, Trento, Italy
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63
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Makenov M, Karan L, Shashina N, Akhmetshina M, Zhurenkova O, Kholodilov I, Karganova G, Smirnova N, Grigoreva Y, Yankovskaya Y, Fyodorova M. First detection of tick-borne encephalitis virus in Ixodes ricinus ticks and their rodent hosts in Moscow, Russia. Ticks Tick Borne Dis 2019; 10:101265. [PMID: 31447316 DOI: 10.1016/j.ttbdis.2019.101265] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 07/10/2019] [Accepted: 07/28/2019] [Indexed: 12/30/2022]
Abstract
Here, we report the first confirmed autochthonous tick-borne encephalitis case diagnosed in Moscow in 2016 and describe the detection of tick-borne encephalitis virus (TBEV) in ticks and small mammals in a Moscow park. The paper includes data from two patients who were bitten by TBEV-infected ticks in Moscow city; one of these cases led to the development of the meningeal form of TBE. Both TBEV-infected ticks attacked patients in the same area. We collected ticks and trapped small mammals in this area in 2017. All samples were screened for the presence of pathogens causing tick-borne diseases by PCR. The TBEV-positive ticks and small mammals' tissue samples were subjected to virus isolation. The sequencing of the complete polyprotein gene of the positive samples was performed. A total of 227 questing ticks were collected. TBEV was detected in five specimens of Ixodes ricinus. We trapped 44 small mammals, mainly bank voles (Myodes glareolus) and pygmy field mice (Apodemus uralensis). Two samples of brain tissue from bank voles yielded a positive signal in RT-PCR for TBEV. We obtained six virus isolates from the ticks and brain tissue of a bank vole. Complete genome sequencing showed that the obtained isolates belong to the European subtype and have low diversity with sequence identities as high as 99.9%. GPS tracking showed that the maximum distance between the exact locations where the TBEV-positive ticks were collected was 185 m. We assume that the forest park had been free of TBEV and that the virus was recently introduced.
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Affiliation(s)
- Marat Makenov
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia.
| | - Lyudmila Karan
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| | - Natalia Shashina
- Sсiеntifiс Rеsеarсh Disinfесtology Institutе, Nauchniy proezd st. 18, Moscow, 117246, Russia
| | - Marina Akhmetshina
- Sсiеntifiс Rеsеarсh Disinfесtology Institutе, Nauchniy proezd st. 18, Moscow, 117246, Russia
| | - Olga Zhurenkova
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| | - Ivan Kholodilov
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI "Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia
| | - Galina Karganova
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI "Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia; Institute for Translational Medicine and Biotechnology, Sechenov University, Bolshaya Pirogovskaya st, 2, page 4, room 106, Moscow, 119991, Russia
| | - Nina Smirnova
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia; Lomonosov Moscow State University, Leninskie Gory st. 1-12, MSU, Faculty of Biology, Moscow, 119991, Russia
| | - Yana Grigoreva
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| | - Yanina Yankovskaya
- Pirogov Russian National Research Medical University, Ostrovityanova st. 1, Moscow, 117997, Russia
| | - Marina Fyodorova
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
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64
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Michelitsch A, Wernike K, Klaus C, Dobler G, Beer M. Exploring the Reservoir Hosts of Tick-Borne Encephalitis Virus. Viruses 2019; 11:E669. [PMID: 31336624 PMCID: PMC6669706 DOI: 10.3390/v11070669] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 12/20/2022] Open
Abstract
Tick-borne encephalitis virus (TBEV) is an important arbovirus, which is found across large parts of Eurasia and is considered to be a major health risk for humans. Like any other arbovirus, TBEV relies on complex interactions between vectors, reservoir hosts, and the environment for successful virus circulation. Hard ticks are the vectors for TBEV, transmitting the virus to a variety of animals. The importance of these animals in the lifecycle of TBEV is still up for debate. Large woodland animals seem to have a positive influence on virus circulation by providing a food source for adult ticks; birds are suspected to play a role in virus distribution. Bank voles and yellow-necked mice are often referred to as classical virus reservoirs, but this statement lacks strong evidence supporting their highlighted role. Other small mammals (e.g., insectivores) may also play a crucial role in virus transmission, not to mention the absence of any suspected reservoir host for non-European endemic regions. Theories highlighting the importance of the co-feeding transmission route go as far as naming ticks themselves as the true reservoir for TBEV, and mammalian hosts as a mere bridge for transmission. A deeper insight into the virus reservoir could lead to a better understanding of the development of endemic regions. The spatial distribution of TBEV is constricted to certain areas, forming natural foci that can be restricted to sizes of merely 500 square meters. The limiting factors for their occurrence are largely unknown, but a possible influence of reservoir hosts on the distribution pattern of TBE is discussed. This review aims to give an overview of the multiple factors influencing the TBEV transmission cycle, focusing on the role of virus reservoirs, and highlights the questions that are waiting to be further explored.
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Affiliation(s)
- Anna Michelitsch
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Kerstin Wernike
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Christine Klaus
- Institute for Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Naumburger Str. 96a, 07743 Jena, Germany
| | - Gerhard Dobler
- Bundeswehr Institute of Microbiology, German Center of Infection Research (DZIF) partner site Munich, Neuherbergstraße 11, 80937 München, Germany
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
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65
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Nah K, Magpantay FMG, Bede-Fazekas Á, Röst G, Trájer AJ, Wu X, Zhang X, Wu J. Assessing systemic and non-systemic transmission risk of tick-borne encephalitis virus in Hungary. PLoS One 2019; 14:e0217206. [PMID: 31163042 PMCID: PMC6548428 DOI: 10.1371/journal.pone.0217206] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 05/07/2019] [Indexed: 01/28/2023] Open
Abstract
Estimating the tick-borne encephalitis (TBE) infection risk under substantial uncertainties of the vector abundance, environmental condition and human-tick interaction is important for evidence-informed public health intervention strategies. Estimating this risk is computationally challenging since the data we observe, i.e., the human incidence of TBE, is only the final outcome of the tick-host transmission and tick-human contact processes. The challenge also increases since the complex TBE virus (TBEV) transmission cycle involves the non-systemic route of transmission between co-feeding ticks. Here, we describe the hidden Markov transition process, using a novel TBEV transmission-human case reporting cascade model that couples the susceptible-infected compartmental model describing the TBEV transmission dynamics among ticks, animal hosts and humans, with the stochastic observation process of human TBE reporting given infection. By fitting human incidence data in Hungary to the transmission model, we estimate key parameters relevant to the tick-host interaction and tick-human transmission. We then use the parametrized cascade model to assess the transmission potential of TBEV in the enzootic cycle with respect to the climate change, and to evaluate the contribution of non-systemic transmission. We show that the TBEV transmission potential in the enzootic cycle has been increasing along with the increased temperature though the TBE human incidence has dropped since 1990s, emphasizing the importance of persistent public health interventions. By demonstrating that non-systemic transmission pathway is a significant factor in the transmission of TBEV in Hungary, we conclude that the risk of TBE infection will be highly underestimated if the non-systemic transmission route is neglected in the risk assessment.
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Affiliation(s)
- Kyeongah Nah
- Department of Mathematics and Statistics, York University, Toronto, Ontario, Canada
| | | | - Ákos Bede-Fazekas
- Institute of Ecology and Botany, MTA Centre for Ecological Research, Vácrátót, Hungary
- GINOP Sustainable Ecosystems Group, MTA Centre for Ecological Research, Tihany, Hungary
| | - Gergely Röst
- Wolfson Centre for Mathematical Biology, University of Oxford, Oxford, United Kingdom
- Bolyai Institute, University of Szeged, Szeged, Hungary
| | - Attila János Trájer
- Department of Limnology, University of Pannonia, Veszprém, Hungary
- Institute of Environmental Engineering, University of Pannonia, Veszprém, Hungary
| | - Xiaotian Wu
- College of Arts and Sciences, Shanghai Maritime University, Shanghai, China
| | - Xue Zhang
- Department of Mathematics, Northeastern University, Shenyang, China
| | - Jianhong Wu
- Department of Mathematics and Statistics, York University, Toronto, Ontario, Canada
- * E-mail:
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66
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Esser HJ, Mögling R, Cleton NB, van der Jeugd H, Sprong H, Stroo A, Koopmans MPG, de Boer WF, Reusken CBEM. Risk factors associated with sustained circulation of six zoonotic arboviruses: a systematic review for selection of surveillance sites in non-endemic areas. Parasit Vectors 2019; 12:265. [PMID: 31133059 PMCID: PMC6537422 DOI: 10.1186/s13071-019-3515-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 05/19/2019] [Indexed: 12/30/2022] Open
Abstract
Arboviruses represent a significant burden to public health and local economies due to their ability to cause unpredictable and widespread epidemics. To maximize early detection of arbovirus emergence in non-endemic areas, surveillance efforts should target areas where circulation is most likely. However, identifying such hotspots of potential emergence is a major challenge. The ecological conditions leading to arbovirus outbreaks are shaped by complex interactions between the virus, its vertebrate hosts, arthropod vector, and abiotic environment that are often poorly understood. Here, we systematically review the ecological risk factors associated with the circulation of six arboviruses that are of considerable concern to northwestern Europe. These include three mosquito-borne viruses (Japanese encephalitis virus, West Nile virus, Rift Valley fever virus) and three tick-borne viruses (Crimean-Congo hemorrhagic fever virus, tick-borne encephalitis virus, and louping-ill virus). We consider both intrinsic (e.g. vector and reservoir host competence) and extrinsic (e.g. temperature, precipitation, host densities, land use) risk factors, identify current knowledge gaps, and discuss future directions. Our systematic review provides baseline information for the identification of regions and habitats that have suitable ecological conditions for endemic circulation, and therefore may be used to target early warning surveillance programs aimed at detecting multi-virus and/or arbovirus emergence.
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Affiliation(s)
- Helen J Esser
- Resource Ecology Group, Wageningen University & Research, Wageningen, The Netherlands. .,Laboratory of Entomology, Wageningen University & Research, Wageningen, The Netherlands.
| | - Ramona Mögling
- Department of Viroscience, WHO CC for arbovirus and viral hemorrhagic fever reference and research, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Natalie B Cleton
- Department of Viroscience, WHO CC for arbovirus and viral hemorrhagic fever reference and research, Erasmus University Medical Centre, Rotterdam, The Netherlands.,Centre for Infectious Disease Control, National Institute for Public Health and Environment (RIVM), Bilthoven, The Netherlands
| | - Henk van der Jeugd
- Vogeltrekstation-Dutch Centre for Avian Migration and Demography, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Hein Sprong
- Centre for Infectious Disease Control, National Institute for Public Health and Environment (RIVM), Bilthoven, The Netherlands
| | - Arjan Stroo
- Centre for Monitoring of Vectors (CMV), National Reference Centre (NRC), Netherlands Food and Consumer Product Safety Authority (NVWA), Ministry of Economic Affairs, Wageningen, The Netherlands
| | - Marion P G Koopmans
- Department of Viroscience, WHO CC for arbovirus and viral hemorrhagic fever reference and research, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Willem F de Boer
- Resource Ecology Group, Wageningen University & Research, Wageningen, The Netherlands
| | - Chantal B E M Reusken
- Department of Viroscience, WHO CC for arbovirus and viral hemorrhagic fever reference and research, Erasmus University Medical Centre, Rotterdam, The Netherlands.,Centre for Infectious Disease Control, National Institute for Public Health and Environment (RIVM), Bilthoven, The Netherlands
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67
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Petersen A, Rosenstierne MW, Rasmussen M, Fuursted K, Nielsen HV, O'Brien Andersen L, Bødker R, Fomsgaard A. Field samplings of Ixodes ricinus ticks from a tick-borne encephalitis virus micro-focus in Northern Zealand, Denmark. Ticks Tick Borne Dis 2019; 10:1028-1032. [PMID: 31151922 DOI: 10.1016/j.ttbdis.2019.05.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 04/25/2019] [Accepted: 05/17/2019] [Indexed: 12/01/2022]
Abstract
In 2008-2009 a tick-borne encephalitis virus (TBEV) micro-focus was detected in Northern Zealand, Denmark. No new cases of TBE with an epidemiological link to Northern Zealand has been reported since. Here we undertook to investigate Ixodes ricinus ticks from this endemic micro-focus in 2016 and 2017. In addition to TBEV, I. ricinus ticks may host other pathogens that include Borrelia spp., Babesia spp., Rickettsia spp. and Neoehrlichia mikurensis, together with various endosymbiont microorganisms. To detect multiple organisms we used a metagenomics PanVirus microarray and next-generation sequencing to examine the persistence and evolution of other emerging viruses, bacteria and parasites. Here we report the rise and fall of the Danish TBEV micro-focus in Northern Zealand. However, we identify for the first time in Danish I. ricinus ticks the presence of Uukuniemi virus in addition to a tick-borne phlebovirus and a range of bacteria.
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Affiliation(s)
- Andreas Petersen
- European Program for Public Health Microbiology Training (EUPHEM), European Centre for Disease Prevention and Control, (ECDC), Solna, Sweden; Virus Research and Development Laboratory, Department of Virus and Microbiological Special Diagnosis, Statens Serum Institut, Copenhagen, Denmark; Bacteria, Parasites and Fungi, Infection Preparedness, Statens Serum Institut, Copenhagen, Denmark.
| | - Maiken Worsøe Rosenstierne
- Virus Research and Development Laboratory, Department of Virus and Microbiological Special Diagnosis, Statens Serum Institut, Copenhagen, Denmark
| | - Morten Rasmussen
- Virus Research and Development Laboratory, Department of Virus and Microbiological Special Diagnosis, Statens Serum Institut, Copenhagen, Denmark
| | - Kurt Fuursted
- Bacteria, Parasites and Fungi, Infection Preparedness, Statens Serum Institut, Copenhagen, Denmark
| | - Henrik Vedel Nielsen
- Bacteria, Parasites and Fungi, Infection Preparedness, Statens Serum Institut, Copenhagen, Denmark
| | - Lee O'Brien Andersen
- Bacteria, Parasites and Fungi, Infection Preparedness, Statens Serum Institut, Copenhagen, Denmark
| | - René Bødker
- DTU National Veterinary Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Anders Fomsgaard
- Virus Research and Development Laboratory, Department of Virus and Microbiological Special Diagnosis, Statens Serum Institut, Copenhagen, Denmark; Infectious Disease Research Unit, Clinical Institute, University of Southern Denmark, Odense, Denmark
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68
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Klemola T, Sormunen JJ, Mojzer J, Mäkelä S, Vesterinen EJ. High tick abundance and diversity of tick-borne pathogens in a Finnish city. Urban Ecosyst 2019. [DOI: 10.1007/s11252-019-00854-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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69
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Elmhalli F, Garboui SS, Borg-Karlson AK, Mozūraitis R, Baldauf SL, Grandi G. The repellency and toxicity effects of essential oils from the Libyan plants Salvadora persica and Rosmarinus officinalis against nymphs of Ixodes ricinus. EXPERIMENTAL & APPLIED ACAROLOGY 2019; 77:585-599. [PMID: 31089978 DOI: 10.1007/s10493-019-00373-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 05/07/2019] [Indexed: 06/09/2023]
Abstract
Essential oils extracted from the leaves of Libyan Rosemary (Rosmarinus officinalis L.), and Miswak (Salvadora persica L.) were evaluated for their acaricidal and repellent effects on Ixodes ricinus L. nymphs (Acari: Ixodidae) using a bioassay based on an 'open filter paper method'. Rosmarinus officinalis leaf essential oil diluted to 0.5 and 1 µl/cm2 in acetone exhibited, respectively, 20 and 100% tick mortality after about 5 h of exposure. A total of 50 and 95% of I. ricinus nymphs were killed by direct contact with the oil when exposed to lethal concentrations (LC) of 0.7 µl/cm2 (LC50) and 0.95 µl/cm2 (LC95), respectively. The LC50 (0.5 µl/cm2) was reached before the end of the first 24 h of exposure time (ET), as tick mortality at 24 h was 60%. Salvadora persica leaf essential oil at 1 µl/cm2 showed a significant repellency effect against I. ricinus nymphs at 1.5 h ET. A 95% repellency was observed at a repellent concentration (RC95) of 1 µl/cm2 of S. persica, but no significant mortality was recorded at this dose of S. persica oil. Gas chromatography-mass spectrometry analyses showed that the main monoterpenes in both oils were 1,8-cineol, α-pinene, and β-pinene, although in markedly different proportions. These results suggest that essential oils have substantial potential as alternative approaches for I. ricinus tick control.
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Affiliation(s)
- Fawzeia Elmhalli
- Department of Systematic Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18d, 752 36, Uppsala, Sweden.
- Department of Environmental Health, Department of Infectious Diseases and Tropical Diseases, Faculty of Public Health, University of Benghazi, Benghazi, Libya.
| | - Samira S Garboui
- Department of Environmental Health, Department of Infectious Diseases and Tropical Diseases, Faculty of Public Health, University of Benghazi, Benghazi, Libya
| | - Anna-Karin Borg-Karlson
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biochemistry and Health, Royal Institute of Technology, KTH, Stockholm, Sweden
| | | | - Sandra L Baldauf
- Department of Systematic Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18d, 752 36, Uppsala, Sweden
| | - Giulio Grandi
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden
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70
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Waits A, Emelyanova A, Oksanen A, Abass K, Rautio A. Human infectious diseases and the changing climate in the Arctic. ENVIRONMENT INTERNATIONAL 2018; 121:703-713. [PMID: 30317100 DOI: 10.1016/j.envint.2018.09.042] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/20/2018] [Accepted: 09/23/2018] [Indexed: 05/22/2023]
Abstract
Climatic factors, especially temperature, precipitation, and humidity play an important role in disease transmission. As the Arctic changes at an unprecedented rate due to climate change, understanding how climatic factors and climate change affect infectious disease rates is important for minimizing human and economic costs. The purpose of this systematic review was to compile recent studies in the field and compare the results to a previously published review. English language searches were conducted in PubMed, ScienceDirect, Scopus, and PLOS One. Russian language searches were conducted in the Scientific Electronic Library "eLibrary.ru". This systematic review yielded 22 articles (51%) published in English and 21 articles (49%) published in Russian since 2012. Articles about zoonotic and vector-borne diseases accounted for 67% (n = 29) of the review. Tick-borne diseases, tularemia, anthrax, and vibriosis were the most researched diseases likely to be impacted by climatic factors in the Arctic. Increased temperature and precipitation are predicted to have the greatest impact on infectious diseases in the Arctic.
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Affiliation(s)
- Audrey Waits
- Arctic Health, Faculty of Medicine, University of Oulu, Finland
| | | | - Antti Oksanen
- Finnish Food Safety Authority Evira (FINPAR), 90590 Oulu, Finland
| | - Khaled Abass
- Arctic Health, Faculty of Medicine, University of Oulu, Finland.
| | - Arja Rautio
- Arctic Health, Faculty of Medicine, University of Oulu, Finland; Thule Institute, University of Arctic, University of Oulu, Finland
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71
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William W, Bülent A, Thomas B, Eduardo B, Marieta B, Olivier B, Celine G, Jolyon M, Dusan P, Francis S, Ducheyne E. The importance of vector abundance and seasonality. ACTA ACUST UNITED AC 2018. [DOI: 10.2903/sp.efsa.2018.en-1491] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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72
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Elmhalli F, Pålsson K, Örberg J, Grandi G. Acaricidal properties of ylang-ylang oil and star anise oil against nymphs of Ixodes ricinus (Acari: Ixodidae). EXPERIMENTAL & APPLIED ACAROLOGY 2018; 76:209-220. [PMID: 30302625 DOI: 10.1007/s10493-018-0299-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
Ylang-ylang oil (YYO) from Cananga odorata (Lam.) Hook.f. & Thomson and star anise oil (SAO) from Illicium verum Hook.f. were tested at four concentrations 0.05, 0.1, 0.2, 0.4 µl/cm2. Mortality rates were obtained by counting dead nymphs at 30-min intervals during the first 5 h after the start of exposure and then at 24, 48 and 72 h. Mortality increased with increasing oil concentration and time of exposure. The two highest concentrations of YYO (0.2, 0.4 µl/cm2) gave maximum lethal concentrations (LC) of 50 and 95% mortality after 4.5 h exposure. Mortality of 95% was obtained after 24 h with the next highest dose (0.1 µl/cm2), whereas LC95 required 3 days with the lowest YYO (0.05 µl/cm2). The lethal effect time (LT) was correlated with the duration of exposure, with a significant effect at 0.4 μl YYO/cm2 after 3 h' (LT50 = 3.2 h, LT95 = 4.3 h). In contrast, only the highest concentration of SAO, 0.4 µl SAO/cm2, showed increasing mortality with time of exposure. This reached LT50 after 10 h and LT95 after 24 h. However, with the lower concentration (0.2 µl/cm2) 50% mortality was reached after 24 h and 100% at 72 h. At to the lowest concentration of SAO (0.1 µl/cm2), 67% mortality after 48 h. The study indicates that YYO and SAO exhibit strong acaricidal properties against nymphs of I. ricinus and suggest that both YYO and SAO should be evaluated as potentially useful in the control of ticks.
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Affiliation(s)
- Fawzeia Elmhalli
- Department of Systematic Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18d, SE-752 36, Uppsala, Sweden.
| | - Katinka Pålsson
- Ecological Chemistry Group, Department of Chemistry, School of Chemical Sciences and Engineering, Royal Institute of Technology, Stockholm, Sweden
| | - Jan Örberg
- Department of Environmental Toxicology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden
| | - Giulio Grandi
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden
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73
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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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74
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Geretti AM, Brook G, Cameron C, Chadwick D, French N, Heyderman R, Ho A, Hunter M, Ladhani S, Lawton M, MacMahon E, McSorley J, Pozniak A, Rodger A. British HIV Association Guidelines on the Use of Vaccines in HIV-Positive Adults 2015. HIV Med 2018; 17 Suppl 3:s2-s81. [PMID: 27568789 DOI: 10.1111/hiv.12424] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Anna Maria Geretti
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | | | | | | | | | | | | | | | | | - Mark Lawton
- Royal Liverpool University Hospital, Liverpool, UK
| | - Eithne MacMahon
- Guy's & St Thomas' NHS Foundation Trust, London, UK.,King's College London, London, UK
| | | | - Anton Pozniak
- Chelsea and Westminster Hospital, NHS Foundation Trust, London, UK
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75
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Andersen NS, Larsen SL, Olesen CR, Stiasny K, Kolmos HJ, Jensen PM, Skarphédinsson S. Continued expansion of tick-borne pathogens: Tick-borne encephalitis virus complex and Anaplasma phagocytophilum in Denmark. Ticks Tick Borne Dis 2018; 10:115-123. [PMID: 30245088 DOI: 10.1016/j.ttbdis.2018.09.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 08/30/2018] [Accepted: 09/13/2018] [Indexed: 12/21/2022]
Abstract
Tick-borne encephalitis virus (TBEV) is a tick-transmitted flavivirus within the tick-borne encephalitis (TBE) complex. The TBE complex is represented by both TBEV and louping ill virus (LIV) in Denmark. Anaplasma phagocytophilum is also transmitted by ticks and is believed to play an essential role in facilitating and aggravating LIV infection in sheep. This study aimed to describe the distribution of TBE complex viruses in Denmark, to establish the possible emergence of new foci and their association with the distribution of A. phagocytophilum. We performed a nationwide seroprevalence study of TBE complex viruses using roe deer (Capreolus capreolus) as sentinels and determined the prevalence of A. phagocytophilum in roe deer. Danish hunters obtained blood samples from roe deer during the hunting season of 2013-14. The samples were examined for TBEV-specific antibodies by virus neutralization tests (NT). A. phagocytophilum infection was assessed by specific real-time-PCR. The overall seroprevalence of the TBE complex viruses in roe deer was 6.9% (51/736). The positive samples were primarily obtained from a known TBE endemic foci and risk areas identified in previous sentinel studies. However, new TBE complex risk areas were also identified. The overall prevalence of A. phagocytophilum was 94.0% (173 PCR-positive of 184 roe deer), which is twice the rate observed ten years ago. These results point to an expansion of these tick-borne diseases geographically and within reservoir populations and, therefore, rationalize the use of sentinel models to monitor changes in transmission of tick-borne diseases and development of new risk areas. We found no association between TBE complex-positive roe deer and the prevalence of A. phagocytophilum, as almost all roe deer were infected. Based on our findings we encourage health care providers to be attentive to tick-borne illnesses such as TBE when treating patients with compatible symptoms.
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Affiliation(s)
- Nanna Skaarup Andersen
- Clinical Centre for Emerging and Vector-borne Infections, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense C, Denmark; Research Unit of Clinical Microbiology, University of Southern Denmark, J.B. Winsløvsvej 21.2, DK-5000, Odense C, Denmark.
| | - Sanne Løkkegaard Larsen
- Clinical Centre for Emerging and Vector-borne Infections, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense C, Denmark; Research Unit of Clinical Microbiology, University of Southern Denmark, J.B. Winsløvsvej 21.2, DK-5000, Odense C, Denmark.
| | | | - Karin Stiasny
- Center for Virology, Medical University Vienna, Kinderspitalgasse 15, A-1090, Vienna, Austria.
| | - Hans Jørn Kolmos
- Research Unit of Clinical Microbiology, University of Southern Denmark, J.B. Winsløvsvej 21.2, DK-5000, Odense C, Denmark.
| | - Per Moestrup Jensen
- Department of Plant- and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Copenhagen, Denmark.
| | - Sigurdur Skarphédinsson
- Clinical Centre for Emerging and Vector-borne Infections, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense C, Denmark; Department of Infectious diseases, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense C, Denmark.
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76
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Narankhajid M, Yeruult C, Gurbadam A, Battsetseg J, Aberle SW, Bayartogtokh B, Joachim A, Duscher GG. Some aspects on tick species in Mongolia and their potential role in the transmission of equine piroplasms, Anaplasma phagocytophilum and Borrelia burgdorferi L. Parasitol Res 2018; 117:3557-3566. [PMID: 30178195 DOI: 10.1007/s00436-018-6053-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 08/13/2018] [Indexed: 10/28/2022]
Abstract
Ticks are cosmopolitan vectors of numerous diseases, and detection of various pathogens in ticks can help to assess their distribution. In the current study, 528 adult ticks were collected from grazing animals or the ground in ten different Mongolian provinces. Dermacentor nuttalli constituted 76.1% of them and was found in all ecozones except the eastern desert. Dermacentor marginatus (8.3%), Dermacentor silvarum (1.1%) and Ixodes persulcatus (3.0%) were found in the northern forest areas and Hyalomma asiaticum (11.4%) only in the southern (semi-)desert. Of these, 359 ticks were subjected to DNA extraction and PCR was carried out to detect various pathogens. Anaplasma spp. was found in D. marginatus and D. nuttalli (2.5% positive each), including flagged specimen and identified as Anaplasma phagocytophilum. Borrelia spp. were found in 2.5% of the ticks (mostly in I. persulcatus) and identified as Borrelia garinii. Babesia spp. (40%) identified as Babesia caballi were detected in all five tick species including flagged Dermacentor spp. and I. persulcatus, and 3.5% of the ticks (all species except D. silvarum) were positive for Theileria spp. identified as Theileria equi. The piroplasms were found in all provinces. Tick-borne encephalitis virus was not detected. The results highlight the high risk of equine piroplasmosis in Mongolia, which is a concern for both the nomadic population who rely on horses for transport and for conservation of Przewalski's horses in Mongolia. In addition, zoonotic agents such as the avian B. garinii and A. phagocytophilum were also detected, outlining a high risk for exposed humans.
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Affiliation(s)
- Myadagsuren Narankhajid
- Institute of Parasitology, Department of Pathobiology, University of Veterinary Medicine Vienna, Veterinaerplatz 1, 1210, Wien, Austria.,Mongolian National University of Medical Sciences, S. Zorig Street 3, Ulaanbaatar, 14210, Mongolia
| | - Chultemsuren Yeruult
- Mongolian National University of Medical Sciences, S. Zorig Street 3, Ulaanbaatar, 14210, Mongolia
| | - Agvaandaram Gurbadam
- Mongolian National University of Medical Sciences, S. Zorig Street 3, Ulaanbaatar, 14210, Mongolia
| | - Jigjav Battsetseg
- National Centre for Zoonotic Diseases, Ministry of Health, Songinokhairkhan 20, Ulaanbaatar, 14219, Mongolia
| | - Stephan W Aberle
- Department of Virology, Medical University of Vienna, Kinderspitalgasse 15, 1095, Vienna, Austria
| | - Badamdorj Bayartogtokh
- Department of Biology, National University of Mongolia, Zaluuchuud Avenue 1, Ulaanbaatar, 14201, Mongolia
| | - Anja Joachim
- Institute of Parasitology, Department of Pathobiology, University of Veterinary Medicine Vienna, Veterinaerplatz 1, 1210, Wien, Austria
| | - Georg Gerhard Duscher
- Institute of Parasitology, Department of Pathobiology, University of Veterinary Medicine Vienna, Veterinaerplatz 1, 1210, Wien, Austria.
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77
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Jaenson TGT, Petersson EH, Jaenson DGE, Kindberg J, Pettersson JHO, Hjertqvist M, Medlock JM, Bengtsson H. The importance of wildlife in the ecology and epidemiology of the TBE virus in Sweden: incidence of human TBE correlates with abundance of deer and hares. Parasit Vectors 2018; 11:477. [PMID: 30153856 PMCID: PMC6114827 DOI: 10.1186/s13071-018-3057-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 08/10/2018] [Indexed: 02/06/2023] Open
Abstract
Background Tick-borne encephalitis (TBE) is one tick-transmitted disease where the human incidence has increased in some European regions during the last two decades. We aim to find the most important factors causing the increasing incidence of human TBE in Sweden. Based on a review of published data we presume that certain temperature-related variables and the population densities of transmission hosts, i.e. small mammals, and of primary tick maintenance hosts, i.e. cervids and lagomorphs, of the TBE virus vector Ixodes ricinus, are among the potentially most important factors affecting the TBE incidence. Therefore, we compare hunting data of the major tick maintenance hosts and two of their important predators, and four climatic variables with the annual numbers of human cases of neuroinvasive TBE. Data for six Swedish regions where human TBE incidence is high or has recently increased are examined by a time-series analysis. Results from the six regions are combined using a meta-analytical method. Results With a one-year time lag, the roe deer (Capreolus capreolus), red deer (Cervus elaphus), mountain hare (Lepus timidus) and European hare (Lepus europaeus) showed positive covariance; the Eurasian elk (moose, Alces alces) and fallow deer (Dama dama) negative covariance; whereas the wild boar (Sus scrofa), lynx (Lynx lynx), red fox (Vulpes vulpes) and the four climate parameters showed no significant covariance with TBE incidence. All game species combined showed positive covariance. Conclusions The epidemiology of TBE varies with time and geography and depends on numerous factors, i.a. climate, virus genotypes, and densities of vectors, tick maintenance hosts and transmission hosts. This study suggests that the increased availability of deer to I. ricinus over large areas of potential tick habitats in southern Sweden increased the density and range of I. ricinus and created new TBEV foci, which resulted in increased incidence of human TBE. New foci may be established by TBE virus-infected birds, or by birds or migrating mammals infested with TBEV-infected ticks. Generally, persistence of TBE virus foci appears to require presence of transmission-competent small mammals, especially mice (Apodemus spp.) or bank voles (Myodes glareolus). Electronic supplementary material The online version of this article (10.1186/s13071-018-3057-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Thomas G T Jaenson
- Department of Organismal Biology, Uppsala University, Norbyvägen 18d, SE-752 36, Uppsala, Sweden.
| | - Erik H Petersson
- Department of Aquatic Resources, Division of Freshwater Research, Swedish University of Agricultural Sciences, Stångholmsvägen 2, SE-178 93, Drottningholm, Sweden
| | - David G E Jaenson
- Department of Automatic Control, Lund University, SE-221 00, Lund, Sweden
| | - Jonas Kindberg
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden
| | - John H-O Pettersson
- Department of Infectious Disease Epidemiology and Modelling, Norwegian Institute of Public Health, Lovisenberggata 8, N-0456, Oslo, Norway.,Department of Medical Biochemistry and Microbiology (IMBIM), Zoonosis Science Center, Uppsala University, Uppsala, Sweden.,Marie Bashir Institute for Infectious Diseases and Biosecurity, Charles Perkins Centre, School of Life and Environmental Sciences and Sydney Medical School, the University of Sydney, Sydney, New South Wales, 2006, Australia.,Public Health Agency of Sweden, Nobels väg 18, SE-171 82, Solna, Sweden
| | - Marika Hjertqvist
- Public Health Agency of Sweden, Nobels väg 18, SE-171 82, Solna, Sweden
| | - Jolyon M Medlock
- Medical Entomology Group, Emergency Response Department, Public Health England, Porton Down, Salisbury, UK.,Health Protection Research Unit in Emerging Infections & Zoonoses, Porton Down, Salisbury, UK
| | - Hans Bengtsson
- Swedish Meteorological and Hydrological Institute (SMHI), Gothenburg, Sweden
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78
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Grzybek M, Alsarraf M, Tołkacz K, Behnke-Borowczyk J, Biernat B, Stańczak J, Strachecka A, Guz L, Szczepaniak K, Paleolog J, Behnke JM, Bajer A. Seroprevalence of TBEV in bank voles from Poland-a long-term approach. Emerg Microbes Infect 2018; 7:145. [PMID: 30108201 PMCID: PMC6092418 DOI: 10.1038/s41426-018-0149-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 05/31/2018] [Accepted: 07/15/2018] [Indexed: 12/18/2022]
Abstract
Rodents are known to play a significant role as reservoir hosts for TBEV. During three sequential expeditions at 4-year intervals to three ecologically similar study sites in NE Poland, we trapped bank voles (Myodes glareolus) and then tested their blood for the presence of specific antiviral antibodies to TBEV. The strongest effects on seroprevalence were the extrinsic factors, site of capture of voles and year of sampling. Seroprevalence increased markedly with increasing host age, and our analysis revealed significant interactions among these three factors. Seroprevalence did not differ between the sexes. Therefore, based on the seroprevalence results, the dynamics of TBEV infection differ significantly in time, between local sub-populations of bank voles and with increasing host age. To fully understand the circulation of the virus among these reservoir hosts and in the environment, long-term monitoring is required and should employ a multi-site approach, such as the one adopted in the current study.
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Affiliation(s)
- Maciej Grzybek
- Department of Tropical Parasitology, Medical University of Gdańsk, Gdańsk, Poland.
| | | | | | | | - Beata Biernat
- Department of Tropical Parasitology, Medical University of Gdańsk, Gdańsk, Poland
| | - Joanna Stańczak
- Department of Tropical Parasitology, Medical University of Gdańsk, Gdańsk, Poland
| | - Aneta Strachecka
- Department of Biological Basis of Animal Production, University of Life Sciences in Lublin, Lublin, Poland
| | - Leszek Guz
- Department of Biology and Fish Disease, University of Life Sciences in Lublin, Lublin, Poland
| | - Klaudiusz Szczepaniak
- Department of Parasitology and Invasive Diseases, University of Life Sciences in Lublin, Lublin, Poland
| | - Jerzy Paleolog
- Department of Zoology, Animal Ecology & Wildlife Management, University of Life Sciences in Lublin, Lublin, Poland
| | - Jerzy M Behnke
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Anna Bajer
- Department of Parasitology, University of Warsaw, Warsaw, Poland
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79
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McMahon BJ, Morand S, Gray JS. Ecosystem change and zoonoses in the Anthropocene. Zoonoses Public Health 2018; 65:755-765. [PMID: 30105852 DOI: 10.1111/zph.12489] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 05/08/2018] [Accepted: 05/27/2018] [Indexed: 12/21/2022]
Abstract
Changes in land use, animal populations and climate, primarily due to increasing human populations, drive the emergence of zoonoses. Force of infection (FOI), which for these diseases is a measure of the ease with which a pathogen reaches the human population, can change with specific zoonoses and context. Here, we outline three ecosystem categories-domestic, peridomestic and sylvatic, where disease ecology alters the FOI of specific zoonoses. Human intervention is an overriding effect in the emergence of zoonoses; therefore, we need to understand the disease ecology and other influencing factors of pathogens and parasites that are likely to interact differently within ecological and cultural contexts. Planning for One Health and community ecology, such as an ecological impact assessment, is required to prepare and manage the emergence and impact of zoonoses in the Anthropocene.
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Affiliation(s)
- Barry J McMahon
- UCD School of Agriculture & Food Science, University College Dublin, Dublin 4, Ireland
| | - Serge Morand
- CNRS - CIRAD ASTRE, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
| | - Jeremy S Gray
- UCD School of Biology & Environmental Science, University College Dublin, Dublin 4, Ireland
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80
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Brugger K, Walter M, Chitimia-Dobler L, Dobler G, Rubel F. Forecasting next season's Ixodes ricinus nymphal density: the example of southern Germany 2018. EXPERIMENTAL & APPLIED ACAROLOGY 2018; 75:281-288. [PMID: 29846854 PMCID: PMC6097749 DOI: 10.1007/s10493-018-0267-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 05/18/2018] [Indexed: 05/13/2023]
Abstract
The castor bean tick, Ixodes ricinus (L.) (Ixodida: Ixodidae), is the principal vector of pathogens causing tick-borne encephalitis or Lyme borreliosis in Europe. It is therefore of general interest to make an estimate of the density of I. ricinus for the whole year at the beginning of the tick season. There are two necessary conditions for making a successful prediction: a long homogeneous time series of observed tick density and a clear biological relationship between environmental predictors and tick density. A 9-year time series covering the period 2009-2017 of nymphal I. ricinus flagged at monthly intervals in southern Germany has been used. With the hypothesis that I. ricinus density is triggered by the fructification of the European beech 2 years before, the mean annual temperature of the previous year, and the current mean winter temperature (December-February), a forecast of the annual nymphal tick density has been made. Therefore, a Poisson regression model was generated resulting in an explained variance of 93.4% and an error of [Formula: see text] ticks per [Formula: see text] (annual [Formula: see text] collected ticks/[Formula: see text]). An independent verification of the forecast for the year 2017 resulted in 187 predicted versus 180 observed nymphs per [Formula: see text]. For the year 2018 a relatively high number of 443 questing I. ricinus nymphs per [Formula: see text] is forecasted, i.e., a "good" tick year.
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Affiliation(s)
- Katharina Brugger
- Institute for Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210, Vienna, Austria.
| | - Melanie Walter
- Institute for Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210, Vienna, Austria
| | - Lidia Chitimia-Dobler
- Bundeswehr Institute of Microbiology, Neuherbergstraße 11, 80937, Munich, Germany
- German Center of Infection Research (DZIF), Partner Site Munich, Munich, Germany
| | - Gerhard Dobler
- Bundeswehr Institute of Microbiology, Neuherbergstraße 11, 80937, Munich, Germany
- German Center of Infection Research (DZIF), Partner Site Munich, Munich, Germany
- Parasitology Unit, University of Hohenheim, Emil-Wolff-Straße 34, 70593, Stuttgart, Germany
| | - Franz Rubel
- Institute for Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210, Vienna, Austria
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81
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Lindqvist R, Upadhyay A, Överby AK. Tick-Borne Flaviviruses and the Type I Interferon Response. Viruses 2018; 10:E340. [PMID: 29933625 PMCID: PMC6071234 DOI: 10.3390/v10070340] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 06/15/2018] [Accepted: 06/19/2018] [Indexed: 12/13/2022] Open
Abstract
Flaviviruses are globally distributed pathogens causing millions of human infections every year. Flaviviruses are arthropod-borne viruses and are mainly transmitted by either ticks or mosquitoes. Mosquito-borne flaviviruses and their interactions with the innate immune response have been well-studied and reviewed extensively, thus this review will discuss tick-borne flaviviruses and their interactions with the host innate immune response.
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Affiliation(s)
- Richard Lindqvist
- Department of Clinical Microbiology, Virology, Umeå University, SE-90185 Umeå, Sweden.
- Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, SE-90187 Umeå, Sweden.
- Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187 Umeå, Sweden.
| | - Arunkumar Upadhyay
- Department of Clinical Microbiology, Virology, Umeå University, SE-90185 Umeå, Sweden.
- Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, SE-90187 Umeå, Sweden.
- Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187 Umeå, Sweden.
| | - Anna K Överby
- Department of Clinical Microbiology, Virology, Umeå University, SE-90185 Umeå, Sweden.
- Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå University, SE-90187 Umeå, Sweden.
- Umeå Centre for Microbial Research (UCMR), Umeå University, SE-90187 Umeå, Sweden.
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82
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Ticks and Tick-Borne Infections: Complex Ecology, Agents, and Host Interactions. Vet Sci 2018; 5:vetsci5020060. [PMID: 29925800 PMCID: PMC6024845 DOI: 10.3390/vetsci5020060] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/11/2018] [Accepted: 06/15/2018] [Indexed: 12/21/2022] Open
Abstract
Ticks transmit the most diverse array of infectious agents of any arthropod vector. Both ticks and the microbes they transmit are recognized as significant threats to human and veterinary public health. This article examines the potential impacts of climate change on the distribution of ticks and the infections they transmit; the emergence of novel tick-borne pathogens, increasing geographic range and incidence of tick-borne infections; and advances in the characterization of tick saliva mediated modulation of host defenses and the implications of those interactions for transmission, establishment, and control of tick infestation and tick-borne infectious agents.
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83
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Slunge D, Boman A. Learning to live with ticks? The role of exposure and risk perceptions in protective behaviour against tick-borne diseases. PLoS One 2018; 13:e0198286. [PMID: 29924806 PMCID: PMC6010238 DOI: 10.1371/journal.pone.0198286] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 05/14/2018] [Indexed: 12/30/2022] Open
Abstract
The purpose of this study is to analyse the role of risk perceptions and exposure for protective behaviour against tick bites and the related diseases Lyme borreliosis (LB) and tick-borne encephalitis (TBE), both of which are growing health concerns. We use data from a national survey in Sweden with respondents in geographical areas with substantial differences in both abundance of ticks and incidence of LB and TBE. We find that the share of respondents who frequently use protective clothing (64%), perform tick checks (63%) or avoid tall grass while in areas with ticks (48%) is relatively high. However, the use of protective measures is uneven and a considerably lower share tuck their trousers into their socks (18%), use repellent against ticks (16%) or use a combination of protective measures. Thirty-one per cent of the respondents report one or more tick bites in the last year and 68% report one or more lifetime tick bites, indicating that it is difficult to protect oneself from tick bites. There is a strong positive association between exposure and checking the skin for ticks, but exposure is only weakly associated with other protective measures. Tick bites are perceived as a serious health risk by as many as 43% of the respondents. The perception that a single tick bite is serious is negatively associated with actual exposure to ticks, while the opposite is true for the perception that tick bites constitute a serious lifetime health risk. This indicates a learning effect in relation to risk perceptions and the performance of tick checks, but not in relation to other protective measures. Recommendations include informing people of the risks associated with tick bites, the efficacy of various protective measures and the importance of combining multiple types of protection. Given the high exposure to tick bites, the growing incidence of TBE and LB, and the difficulties in preventing tick bites, other preventive measures should be further discussed, including vaccination programmes.
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Affiliation(s)
- Daniel Slunge
- Department of Economics, University of Gothenburg, Gothenburg, Sweden
- Gothenburg Centre for Sustainable Development, University of Gothenburg, Gothenburg, Sweden
- * E-mail:
| | - Anders Boman
- Department of Economics, University of Gothenburg, Gothenburg, Sweden
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84
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Grandi G, Aspán A, Pihl J, Gustafsson K, Engström F, Jinnerot T, Söderlund R, Chirico J. Detection of Tick-Borne Pathogens in Lambs Undergoing Prophylactic Treatment Against Ticks on Two Swedish Farms. Front Vet Sci 2018; 5:72. [PMID: 29713635 PMCID: PMC5911771 DOI: 10.3389/fvets.2018.00072] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 03/26/2018] [Indexed: 01/08/2023] Open
Abstract
Tick-borne pathogens (TBPs), especially Anaplasma phagocytophilum, cause disease in grazing livestock. Tick prophylaxis is, therefore, a routine practice in sheep flocks in Sweden, especially in central, southern, and coastal areas of the country where ixodid ticks (Ixodes ricinus and Haemaphysalis punctata) are present. In the present study, the status of infection by A. phagocytophilum and other TBPs in lambs treated with tick prophylaxis has been assessed serologically and with polymerase chain reaction (PCR). Blood samples (n = 78) from lambs (n = 20) subjected to regular tick prophylactic treatment (flumethrin, Bayticol®) at two sites in different regions in Sweden (Östergötland, Gotland) were collected on four occasions from May until July 2013. The severity of clinical signs in Anaplasma-infected animals is known to differ between these two regions. In total, 20% of blood samples were PCR-positive for A. phagocytophilum. Serological analyses showed that 33% of all collected samples were positive for A. phagocytophilum, while 2.5% were positive for Borrelia burgdorferi s.l. and 13% for tick-borne encephalitis virus (TBEV). Percentages of lambs positive were 75 and 45% for A. phagocytophilum antibodies and DNA, respectively, while 10 and 45% were serologically positive for B. burgdorferi s.l. and TBEV, respectively. Sequencing of partial 16S rRNA genes from Anaplasma PCR positive samples revealed presence of A. phagocytophilum in all animals in Östergötland, while sequences consistent with A. phagocytophilum as well as A. capra and A. bovis were found on the island of Gotland. This is the first report of the occurrence of the latter two species in Sweden.
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Affiliation(s)
- Giulio Grandi
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden.,Department of Biomedical Sciences and Veterinary Public Health, Section for Parasitology, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden
| | - Anna Aspán
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden
| | - Jenny Pihl
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden
| | | | | | - Tomas Jinnerot
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden
| | - Robert Söderlund
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden
| | - Jan Chirico
- Department of Microbiology, National Veterinary Institute (SVA), Uppsala, Sweden
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85
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Tokarevich N, Tronin A, Gnativ B, Revich B, Blinova O, Evengard B. Impact of air temperature variation on the ixodid ticks habitat and tick-borne encephalitis incidence in the Russian Arctic: the case of the Komi Republic. Int J Circumpolar Health 2018; 76:1298882. [PMID: 28362566 PMCID: PMC5405447 DOI: 10.1080/22423982.2017.1298882] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND The causes of the recent rise of tick-borne encephalitis (TBE) incidence in Europe are discussed. Our objective was to estimate the impact of air temperature change on TBE incidence in the European part of the Russian Arctic. METHODS We analysed the TBE incidence in the Komi Republic (RK) over a 42-year period in relation to changes in local annual average air temperature, air temperature during the season of tick activity, tick abundance, TBE-prevalence in ticks, tick-bite incidence rate, and normalised difference vegetation index within the area under study. RESULTS In 1998-2011 in RK a substantial growth of TBE virus (TBEV) prevalence both in questing and feeding ticks was observed. In 1992-2011 there was 23-fold growth of the tick-bite incidence rate in humans, a northward shift of the reported tick bites, and the season of tick bites increased from 4 to 6 months. In 1998-2011 there was more than 6-fold growth of average annual TBE incidence compared with 1970-1983 and 1984-1997 periods. This resulted both from the northward shift of TBE, and its growth in the south. In our view it was related to local climate change as both the average annual air temperature, and the air temperature during the tick activity season grew substantially. We revealed in RK a strong correlation between the change in the air temperature and that in TBE incidence. The satellite data showed NDVI growth within RK, i.e. alteration of the local ecosystem under the influence of climate change. CONCLUSIONS The rise in TBE incidence in RK is related considerably to the expansion of the range of Ixodes persulcatus. The territory with reported TBE cases also expanded northward. Climate change is an important driver of TBE incidence rate growth.
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Affiliation(s)
- N Tokarevich
- a Laboratory of Zoonoses , St Petersburg Pasteur Institute , St Petersburg , Russia
| | - A Tronin
- b Scientific Research Center for Ecological Safety , Russian Academy of Sciences , St Petersburg , Russia
| | - B Gnativ
- c Center for Hygiene and Epidemiology of Komi Republic , Syktyvkar , Russia
| | - B Revich
- d Institute of Forecasting , Russian Academy of Sciences , Moscow , Russia
| | - O Blinova
- a Laboratory of Zoonoses , St Petersburg Pasteur Institute , St Petersburg , Russia
| | - B Evengard
- e University Hospital , Umea University , Umea , Sweden
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86
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Grabowski JM, Offerdahl DK, Bloom ME. The Use of Ex Vivo Organ Cultures in Tick-Borne Virus Research. ACS Infect Dis 2018; 4:247-256. [PMID: 29473735 DOI: 10.1021/acsinfecdis.7b00274] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Each year there are more than 15 000 cases of human disease caused by infections with tick-borne viruses (TBVs). These illnesses occur worldwide and can range from very mild illness to severe encephalitis and hemorrhagic fever. Although TBVs are currently identified as neglected vector-borne pathogens and receive less attention than mosquito-borne viruses, TBVs are expanding into new regions, and infection rates are increasing. Furthermore, effective vaccines, diagnostic tools, and other countermeasures are limited. The application of contemporary technologies to TBV infections presents an excellent opportunity to develop improved, effective countermeasures. Experimental tick and mammal models of infection can be used to characterize determinants of infection, transmission, and virulence and to test candidate countermeasures. The use of ex vivo tick cultures in TBV research provides a unique way to look at infection in specific tick organs. Mammal ex vivo organ slice and, more recently, organoid cultures are additional models that can be used to elucidate direct tissue-specific responses to infection. These ex vivo model systems are convenient for testing methods involving transcript knockdown and small molecules under tightly controlled conditions. They can also be combined with in vitro and in vivo studies to tease out possible host factors and potential vaccine or therapeutic candidates. In this brief perspective, we describe how ex vivo cultures can be combined with modern technologies to advance research on TBV infections.
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Affiliation(s)
- Jeffrey M. Grabowski
- Biology of Vector-Borne Viruses Section, Laboratory of Virology, Rocky Mountain Laboratories, NIAID/NIH, 903 South Fourth Street, Hamilton, Montana 59840, United States
| | - Danielle K. Offerdahl
- Biology of Vector-Borne Viruses Section, Laboratory of Virology, Rocky Mountain Laboratories, NIAID/NIH, 903 South Fourth Street, Hamilton, Montana 59840, United States
| | - Marshall E. Bloom
- Biology of Vector-Borne Viruses Section, Laboratory of Virology, Rocky Mountain Laboratories, NIAID/NIH, 903 South Fourth Street, Hamilton, Montana 59840, United States
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87
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Sprong H, Azagi T, Hoornstra D, Nijhof AM, Knorr S, Baarsma ME, Hovius JW. Control of Lyme borreliosis and other Ixodes ricinus-borne diseases. Parasit Vectors 2018; 11:145. [PMID: 29510749 PMCID: PMC5840726 DOI: 10.1186/s13071-018-2744-5] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 02/23/2018] [Indexed: 12/25/2022] Open
Abstract
Lyme borreliosis (LB) and other Ixodes ricinus-borne diseases (TBDs) are diseases that emerge from interactions of humans and domestic animals with infected ticks in nature. Nature, environmental and health policies at (inter)national and local levels affect the risk, disease burden and costs of TBDs. Knowledge on ticks, their pathogens and the diseases they cause have been increasing, and resulted in the discovery of a diversity of control options, which often are not highly effective on their own. Control strategies involving concerted actions from human and animal health sectors as well as from nature managers have not been formulated, let alone implemented. Control of TBDs asks for a “health in all policies” approach, both at the (inter)national level, but also at local levels. For example, wildlife protection and creating urban green spaces are important for animal and human well-being, but may increase the risk of TBDs. In contrast, culling or fencing out deer decreases the risk for TBDs under specific conditions, but may have adverse effects on biodiversity or may be societally unacceptable. Therefore, in the end, nature and health workers together must carry out tailor-made control options for the control of TBDs for humans and animals, with minimal effects on the environment. In that regard, multidisciplinary approaches in environmental, but also medical settings are needed. To facilitate this, communication and collaboration between experts from different fields, which may include patient representatives, should be promoted.
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Affiliation(s)
- Hein Sprong
- Centre for Zoonoses & Environmental Microbiology, Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, the Netherlands. .,Laboratory of Entomology, Wageningen University and Research Centre, Wageningen, the Netherlands.
| | - Tal Azagi
- Centre for Zoonoses & Environmental Microbiology, Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
| | - Dieuwertje Hoornstra
- Center for Experimental and Molecular Medicine, Academic Medical Center, Amsterdam, the Netherlands
| | - Ard M Nijhof
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Sarah Knorr
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - M Ewoud Baarsma
- Center for Experimental and Molecular Medicine, Academic Medical Center, Amsterdam, the Netherlands
| | - Joppe W Hovius
- Center for Experimental and Molecular Medicine, Academic Medical Center, Amsterdam, the Netherlands
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88
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Distribution of Ixodes ricinus ticks and prevalence of tick-borne encephalitis virus among questing ticks in the Arctic Circle region of northern Norway. Ticks Tick Borne Dis 2018; 9:97-103. [DOI: 10.1016/j.ttbdis.2017.10.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 08/29/2017] [Accepted: 10/02/2017] [Indexed: 11/19/2022]
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89
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Cavalleri D, Murphy M, Seewald W, Drake J, Nanchen S. A randomized, controlled study to assess the efficacy and safety of lotilaner (Credelio™) in controlling ticks in client-owned dogs in Europe. Parasit Vectors 2017; 10:531. [PMID: 29089058 PMCID: PMC5664821 DOI: 10.1186/s13071-017-2478-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 10/12/2017] [Indexed: 06/14/2024] Open
Abstract
BACKGROUND Oral administration of lotilaner flavoured chewable tablets (Credelio™, Elanco) to dogs has been shown to provide a rapid onset of killing activity of infesting ticks, with sustained efficacy for at least 35 days. A study was undertaken in Europe to confirm lotilaner's safety and anti-tick efficacy in client-owned dogs. METHODS In this assessor-blinded study, dogs were enrolled at 19 clinics in Germany, Hungary and Portugal. Qualifying households with no more than three dogs were randomized in an approximate 2:1 ratio to a lotilaner or fipronil/(S)-methoprene (FSM) (Frontline® Combo Spot-on, Merial) treatment group. One household dog with at least three live attached ticks was the primary dog. Treatments were dispensed Days 0, 28 (± 2) and 56 (± 2) for owner administration to all household dogs. Tick counts were performed on primary dogs Days 7 (± 1), and ±2 days on Days 14, 21, 28, 42, 56, 70 and 84; supplementary dogs were assessed for safety ± 2 days on Days 28, 56 and 84. Efficacy was assessed by comparing mean Day 0 live attached tick counts with subsequent counts. RESULTS The most frequently retrieved ticks were Ixodes ricinus, Dermacentor reticulatus and Rhipicephalus sanguineus (sensu lato), with Ixodes hexagonus also present. In the lotilaner group (n = 127) geometric mean tick count reductions were at least 98% from the first post-treatment visit (Day 7) through Day 56, when efficacy was 100%. For FSM (n = 68), efficacy remained at least 96% through Day 84, but at no point were all dogs free of live attached ticks. Mean counts in lotilaner-treated dogs were significantly lower than FSM-treated dogs on Days 7, 42, 70 and 84 (P < 0.05). Percent efficacy over all post-enrolment visits was 99.3 and 98.3% for lotilaner and FSM groups, respectively (t (190) = 2.23, P = 0.0268). Owners successfully administered all treatments, and both products were well-tolerated. CONCLUSION Under European field conditions, lotilaner flavoured chewable tablets administered monthly, were > 98% effective in eliminating live ticks from the first post-treatment assessment (Day 7) through Day 56 and maintained 100% of dogs tick-free on Days 70 and 84. Lotilaner was safe, providing superior tick control to FSM administered according to the same schedule.
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Affiliation(s)
| | - Martin Murphy
- Elanco Animal Health, Mattenstrasse 24a, 4058, Basel, Switzerland
| | - Wolfgang Seewald
- Elanco Animal Health, Mattenstrasse 24a, 4058, Basel, Switzerland
| | - Jason Drake
- Elanco Animal Health, 2500 Innovation Way, Greenfield, IN, 46140, USA.
| | - Steve Nanchen
- Elanco Animal Health, Mattenstrasse 24a, 4058, Basel, Switzerland
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90
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Mansfield KL, Jizhou L, Phipps LP, Johnson N. Emerging Tick-Borne Viruses in the Twenty-First Century. Front Cell Infect Microbiol 2017; 7:298. [PMID: 28744449 PMCID: PMC5504652 DOI: 10.3389/fcimb.2017.00298] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 06/19/2017] [Indexed: 12/18/2022] Open
Abstract
Ticks, as a group, are second only to mosquitoes as vectors of pathogens to humans and are the primary vector for pathogens of livestock, companion animals, and wildlife. The role of ticks in the transmission of viruses has been known for over 100 years and yet new pathogenic viruses are still being detected and known viruses are continually spreading to new geographic locations. Partly as a result of their novelty, tick-virus interactions are at an early stage in understanding. For some viruses, even the principal tick-vector is not known. It is likely that tick-borne viruses will continue to emerge and challenge public and veterinary health long into the twenty-first century. However, studies focusing on tick saliva, a critical component of tick feeding, virus transmission, and a target for control of ticks and tick-borne diseases, point toward solutions to emerging viruses. The aim of this review is to describe some currently emerging tick-borne diseases, their causative viruses, and to discuss research on virus-tick interactions. Through focus on this area, future protein targets for intervention and vaccine development may be identified.
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Affiliation(s)
- Karen L Mansfield
- Animal and Plant Health AgencyAddlestone, United Kingdom.,Institute of Infection and Global Health, University of LiverpoolLiverpool, United Kingdom
| | - Lv Jizhou
- Animal and Plant Health AgencyAddlestone, United Kingdom.,Chinese Academy of Inspection and QuarantineBeijing, China
| | - L Paul Phipps
- Animal and Plant Health AgencyAddlestone, United Kingdom
| | - Nicholas Johnson
- Animal and Plant Health AgencyAddlestone, United Kingdom.,Faculty of Health and Medicine, University of SurreyGuildford, United Kingdom
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91
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Izuogu AO, McNally KL, Harris SE, Youseff BH, Presloid JB, Burlak C, Munshi-South J, Best SM, Taylor RT. Interferon signaling in Peromyscus leucopus confers a potent and specific restriction to vector-borne flaviviruses. PLoS One 2017; 12:e0179781. [PMID: 28650973 PMCID: PMC5484488 DOI: 10.1371/journal.pone.0179781] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 06/04/2017] [Indexed: 02/07/2023] Open
Abstract
Tick-borne flaviviruses (TBFVs), including Powassan virus and tick-borne encephalitis virus cause encephalitis or hemorrhagic fevers in humans with case-fatality rates ranging from 1-30%. Despite severe disease in humans, TBFV infection of natural rodent hosts has little noticeable effect. Currently, the basis for resistance to disease is not known. We hypothesize that the coevolution of flaviviruses with their respective hosts has shaped the evolution of potent antiviral factors that suppress virus replication and protect the host from lethal infection. In the current study, we compared virus infection between reservoir host cells and related susceptible species. Infection of primary fibroblasts from the white-footed mouse (Peromyscus leucopus, a representative host) with a panel of vector-borne flaviviruses showed up to a 10,000-fold reduction in virus titer compared to control Mus musculus cells. Replication of vesicular stomatitis virus was equivalent in P. leucopus and M. musculus cells suggesting that restriction was flavivirus-specific. Step-wise comparison of the virus infection cycle revealed a significant block to viral RNA replication, but not virus entry, in P. leucopus cells. To understand the role of the type I interferon (IFN) response in virus restriction, we knocked down signal transducer and activator of transcription 1 (STAT1) or the type I IFN receptor (IFNAR1) by RNA interference. Loss of IFNAR1 or STAT1 significantly relieved the block in virus replication in P. leucopus cells. The major IFN antagonist encoded by TBFV, nonstructural protein 5, was functional in P. leucopus cells, thus ruling out ineffective viral antagonism of the host IFN response. Collectively, this work demonstrates that the IFN response of P. leucopus imparts a strong and virus-specific barrier to flavivirus replication. Future identification of the IFN-stimulated genes responsible for virus restriction specifically in P. leucopus will yield mechanistic insight into efficient control of virus replication and may inform the development of antiviral therapeutics.
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MESH Headings
- Animals
- Cells, Cultured
- Disease Models, Animal
- Encephalitis Viruses, Tick-Borne/genetics
- Encephalitis Viruses, Tick-Borne/immunology
- Encephalitis Viruses, Tick-Borne/pathogenicity
- Encephalitis, Tick-Borne/genetics
- Encephalitis, Tick-Borne/immunology
- Encephalitis, Tick-Borne/virology
- Host Specificity/genetics
- Host Specificity/immunology
- Host-Pathogen Interactions/genetics
- Host-Pathogen Interactions/immunology
- Humans
- Interferon Type I/antagonists & inhibitors
- Interferon Type I/immunology
- Mice
- Peromyscus/genetics
- Peromyscus/immunology
- Peromyscus/virology
- RNA, Small Interfering/genetics
- RNA, Viral/genetics
- Receptor, Interferon alpha-beta/antagonists & inhibitors
- Receptor, Interferon alpha-beta/genetics
- Receptor, Interferon alpha-beta/immunology
- STAT1 Transcription Factor/antagonists & inhibitors
- STAT1 Transcription Factor/genetics
- STAT1 Transcription Factor/immunology
- Signal Transduction/genetics
- Signal Transduction/immunology
- Viral Nonstructural Proteins/immunology
- Virus Replication/genetics
- Virus Replication/immunology
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Affiliation(s)
- Adaeze O. Izuogu
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio, United States of America
| | - Kristin L. McNally
- Innate Immunity and Pathogenesis Unit, Laboratory of Virology, Rocky Mountain Laboratories, DIR, NIAID, NIH, Hamilton, Montana, United States of America
| | - Stephen E. Harris
- The Graduate Center, City University of New York, New York, New York, United States of America
| | - Brian H. Youseff
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio, United States of America
| | - John B. Presloid
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio, United States of America
| | - Christopher Burlak
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Jason Munshi-South
- Louis Calder Center-Biological Field Station, Fordham University, Armonk, New York, United States of America
| | - Sonja M. Best
- Innate Immunity and Pathogenesis Unit, Laboratory of Virology, Rocky Mountain Laboratories, DIR, NIAID, NIH, Hamilton, Montana, United States of America
| | - R. Travis Taylor
- Department of Medical Microbiology and Immunology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio, United States of America
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92
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Asghar N, Pettersson JHO, Dinnetz P, Andreassen Å, Johansson M. Deep sequencing analysis of tick-borne encephalitis virus from questing ticks at natural foci reveals similarities between quasispecies pools of the virus. J Gen Virol 2017; 98:413-421. [PMID: 28073402 PMCID: PMC5797951 DOI: 10.1099/jgv.0.000704] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Every year, tick-borne encephalitis virus (TBEV) causes severe central nervous system infection in 10 000 to 15 000 people in Europe and Asia. TBEV is maintained in the environment by an enzootic cycle that requires a tick vector and a vertebrate host, and the adaptation of TBEV to vertebrate and invertebrate environments is essential for TBEV persistence in nature. This adaptation is facilitated by the error-prone nature of the virus’s RNA-dependent RNA polymerase, which generates genetically distinct virus variants called quasispecies. TBEV shows a focal geographical distribution pattern where each focus represents a TBEV hotspot. Here, we sequenced and characterized two TBEV genomes, JP-296 and JP-554, from questing Ixodes ricinus ticks at a TBEV focus in central Sweden. Phylogenetic analysis showed geographical clustering among the newly sequenced strains and three previously sequenced Scandinavian strains, Toro-2003, Saringe-2009 and Mandal-2009, which originated from the same ancestor. Among these five Scandinavian TBEV strains, only Mandal-2009 showed a large deletion within the 3′ non-coding region (NCR), similar to the highly virulent TBEV strain Hypr. Deep sequencing of JP-296, JP-554 and Mandal-2009 revealed significantly high quasispecies diversity for JP-296 and JP-554, with intact 3′NCRs, compared to the low diversity in Mandal-2009, with a truncated 3′NCR. Single-nucleotide polymorphism analysis showed that 40 % of the single-nucleotide polymorphisms were common between quasispecies populations of JP-296 and JP-554, indicating a putative mechanism for how TBEV persists and is maintained within its natural foci.
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Affiliation(s)
- Naveed Asghar
- School of Natural Science, Technology & Environmental Studies, Södertörn University, Huddinge, Sweden.,School of Medical Sciences, Örebro University, Örebro, Sweden.,iRiSC - Inflammatory Response and Infection Susceptibility Centre, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - John H-O Pettersson
- Department of Infectious Disease Epidemiology and Modelling, Norwegian Institute of Public Health, Oslo, Norway.,Department of Microbiology, National Veterinary Institute, Uppsala, Sweden.,Department of Medical Biochemistry and Microbiology (IMBIM), Zoonosis Science Center, Uppsala University, Uppsala, Sweden
| | - Patrik Dinnetz
- School of Natural Science, Technology & Environmental Studies, Södertörn University, Huddinge, Sweden
| | - Åshild Andreassen
- Department of Virology, Division of Infectious Disease Control, Norwegian Institute of Public Health, Oslo, Norway
| | - Magnus Johansson
- School of Medical Sciences, Örebro University, Örebro, Sweden.,iRiSC - Inflammatory Response and Infection Susceptibility Centre, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
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93
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Zintl A, Moutailler S, Stuart P, Paredis L, Dutraive J, Gonzalez E, O'Connor J, Devillers E, Good B, OMuireagain C, De Waal T, Morris F, Gray J. Ticks and Tick-borne diseases in Ireland. Ir Vet J 2017; 70:4. [PMID: 28163889 PMCID: PMC5282849 DOI: 10.1186/s13620-017-0084-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 01/19/2017] [Indexed: 11/12/2022] Open
Abstract
Throughout Europe interest in tick-borne agents is increasing, particularly with regard to those that can cause human disease. The reason for this is the apparent rise in the incidence of many tick-borne diseases (TBD’s). While there has never been a national survey of ticks or TBD’s in Ireland, the trend here appears to be the reverse with a decline in the incidence of some agents seemingly associated with decreasing tick numbers particularly on agricultural land. In the absence of robust baseline data, however, this development cannot be confirmed. This review collates the limited information available from several dated published records on tick species and a small number of studies focused on certain TBD’s. Some pilot data on tick density and TBD agents collected in 2016 are also presented. The aim is to explore the particular situation in Ireland with regard to ticks and TBD’s and to provide a reference for future workers in the field.
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Affiliation(s)
- Annetta Zintl
- UCD School of Veterinary Medicine, University College Dublin, Belfield, Ireland
| | - Sara Moutailler
- UMR BIPAR, ANSES, INRA, ENVA, Animal Health Laboratory, 14 rue Pierre et Marie Curie, 94700 Maisons-Alfort, France
| | - Peter Stuart
- Department of Zoology, Trinity College Dublin, Dublin 2, Ireland
| | - Linda Paredis
- Department of Zoology, Trinity College Dublin, Dublin 2, Ireland
| | | | | | | | - Elodie Devillers
- UMR BIPAR, ANSES, INRA, ENVA, Animal Health Laboratory, 14 rue Pierre et Marie Curie, 94700 Maisons-Alfort, France
| | - Barbara Good
- Animal & Grassland Research and Innovation Centre, Teagasc, Athenry, Co. Galway Ireland
| | - Colm OMuireagain
- Department of Agriculture, Food and the Marine, Sligo Regional Veterinary Laboratory, Sligo, Ireland
| | - Theo De Waal
- UCD School of Veterinary Medicine, University College Dublin, Belfield, Ireland
| | | | - Jeremy Gray
- School of Biology and Environmental Science (Emeritus Professor), University College Dublin, Belfield, Ireland
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94
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95
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The role of the poly(A) tract in the replication and virulence of tick-borne encephalitis virus. Sci Rep 2016; 6:39265. [PMID: 27982069 PMCID: PMC5159820 DOI: 10.1038/srep39265] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 11/21/2016] [Indexed: 12/11/2022] Open
Abstract
The tick-borne encephalitis virus (TBEV) is a flavivirus transmitted to humans, usually via tick bites. The virus causes tick-borne encephalitis (TBE) in humans, and symptoms range from mild flu-like symptoms to severe and long-lasting sequelae, including permanent brain damage. It has been suggested that within the population of viruses transmitted to the mammalian host, quasispecies with neurotropic properties might become dominant in the host resulting in neurological symptoms. We previously demonstrated the existence of TBEV variants with variable poly(A) tracts within a single blood-fed tick. To characterize the role of the poly(A) tract in TBEV replication and virulence, we generated infectious clones of Torö-2003 with the wild-type (A)3C(A)6 sequence (Torö-6A) or with a modified (A)3C(A)38 sequence (Torö-38A). Torö-38A replicated poorly compared to Torö-6A in cell culture, but Torö-38A was more virulent than Torö-6A in a mouse model of TBE. Next-generation sequencing of TBEV genomes after passaging in cell culture and/or mouse brain revealed mutations in specific genomic regions and the presence of quasispecies that might contribute to the observed differences in virulence. These data suggest a role for quasispecies development within the poly(A) tract as a virulence determinant for TBEV in mice.
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96
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Földvári G, Široký P, Szekeres S, Majoros G, Sprong H. Dermacentor reticulatus: a vector on the rise. Parasit Vectors 2016; 9:314. [PMID: 27251148 PMCID: PMC4888597 DOI: 10.1186/s13071-016-1599-x] [Citation(s) in RCA: 159] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 05/18/2016] [Indexed: 12/12/2022] Open
Abstract
Dermacentor reticulatus is a hard tick species with extraordinary biological features. It has a high reproduction rate, a rapid developmental cycle, and is also able to overcome years of unfavourable conditions. Dermacentor reticulatus can survive under water for several months and is cold-hardy even compared to other tick species. It has a wide host range: over 60 different wild and domesticated hosts are known for the three active developmental stages. Its high adaptiveness gives an edge to this tick species as shown by new data on the emergence and establishment of D. reticulatus populations throughout Europe. The tick has been the research focus of a growing number of scientists, physicians and veterinarians. Within the Web of Science database, more than a fifth of the over 700 items published on this species between 1897 and 2015 appeared in the last three years (2013–2015). Here we attempt to synthesize current knowledge on the systematics, ecology, geographical distribution and recent spread of the species and to highlight the great spectrum of possible veterinary and public health threats it poses. Canine babesiosis caused by Babesia canis is a severe leading canine vector-borne disease in many endemic areas. Although less frequently than Ixodes ricinus, D. reticulatus adults bite humans and transmit several Rickettsia spp., Omsk haemorrhagic fever virus or Tick-borne encephalitis virus. We have not solely collected and reviewed the latest and fundamental scientific papers available in primary databases but also widened our scope to books, theses, conference papers and specialists colleagues’ experience where needed. Besides the dominant literature available in English, we also tried to access scientific literature in German, Russian and eastern European languages as well. We hope to inspire future research projects that are necessary to understand the basic life-cycle and ecology of this vector in order to understand and prevent disease threats. We conclude that although great strides have been made in our knowledge of the eco-epidemiology of this species, several gaps still need to be filled with basic research, targeting possible reservoir and vector roles and the key factors resulting in the observed geographical spread of D. reticulatus.
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Affiliation(s)
- Gábor Földvári
- Department of Parasitology and Zoology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary.
| | - Pavel Široký
- Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic.,CEITEC-Central European Institute of Technology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Sándor Szekeres
- Department of Parasitology and Zoology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
| | - Gábor Majoros
- Department of Parasitology and Zoology, Faculty of Veterinary Science, Szent István University, Budapest, Hungary
| | - Hein Sprong
- National Institute of Public Health and the Environment, Bilthoven, The Netherlands
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97
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Levanov L, Vera CP, Vapalahti O. Prevalence estimation of tick-borne encephalitis virus (TBEV) antibodies in dogs from Finland using novel dog anti-TBEV IgG MAb-capture and IgG immunofluorescence assays based on recombinant TBEV subviral particles. Ticks Tick Borne Dis 2016; 7:979-982. [PMID: 27189583 DOI: 10.1016/j.ttbdis.2016.05.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 04/24/2016] [Accepted: 05/04/2016] [Indexed: 11/17/2022]
Abstract
Tick-borne encephalitis (TBE) is one of the most dangerous human neurological infections occurring in Europe and Northern parts of Asia with thousands of cases and millions vaccinated against it. The risk of TBE might be assessed through analyses of the samples taken from wildlife or from animals which are in close contact with humans. Dogs have been shown to be a good sentinel species for these studies. Serological assays for diagnosis of TBE in dogs are mainly based on purified and inactivated TBEV antigens. Here we describe novel dog anti-TBEV IgG monoclonal antibody (MAb)-capture assay which is based on TBEV prME subviral particles expressed in mammalian cells from Semliki Forest virus (SFV) replicon as well as IgG immunofluorescence assay (IFA) which is based on Vero E6 cells transfected with the same SFV replicon. We further demonstrate their use in a small-scale TBEV seroprevalence study of dogs representing different regions of Finland. Altogether, 148 dog serum samples were tested by novel assays and results were compared to those obtained with a commercial IgG enzyme immunoassay (EIA), hemagglutination inhibition test and IgG IFA with TBEV infected cells. Compared to reference tests, the sensitivities of the developed assays were 90-100% and the specificities of the two assays were 100%. Analysis of the dog serum samples showed a seroprevalence of 40% on Åland Islands and 6% on Southwestern archipelago of Finland. In conclusion, a specific and sensitive EIA and IFA for the detection of IgG antibodies in canine sera were developed. Based on these assays the seroprevalence of IgG antibodies in dogs from different regions of Finland was assessed and was shown to parallel the known human disease burden as the Southwestern archipelago and Åland Islands in particular had considerable dog TBEV antibody prevalence and represent areas with high risk of TBE for humans.
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Affiliation(s)
- Lev Levanov
- Department of Virology, University of Helsinki, Helsinki, Finland.
| | - Cristina Pérez Vera
- Department of Virology, University of Helsinki, Helsinki, Finland; Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland; Department of Clinical Veterinary Studies, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Olli Vapalahti
- Department of Virology, University of Helsinki, Helsinki, Finland; Department of Virology and Immunology, Helsinki University Hospital, Helsinki, Finland; Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland.
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98
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Hartemink N, Takken W. Trends in tick population dynamics and pathogen transmission in emerging tick-borne pathogens in Europe: an introduction. EXPERIMENTAL & APPLIED ACAROLOGY 2016; 68:269-78. [PMID: 26782278 DOI: 10.1007/s10493-015-0003-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/10/2015] [Indexed: 05/26/2023]
Affiliation(s)
- Nienke Hartemink
- Theoretical Ecology group, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, 1098 XH, Amsterdam, The Netherlands.
| | - Willem Takken
- Laboratory of Entomology, Wageningen University and Research Centre, PO Box 8031, 6700 EH, Wageningen, The Netherlands
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99
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Six RH, Geurden T, Carter L, Everett WR, McLoughlin A, Mahabir SP, Myers MR, Slootmans N. Evaluation of the speed of kill of sarolaner (Simparica™) against induced infestations of three species of ticks (Amblyomma maculatum, Ixodes scapularis, Ixodes ricinus) on dogs. Vet Parasitol 2016; 222:37-42. [PMID: 26928659 DOI: 10.1016/j.vetpar.2016.02.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 12/27/2015] [Accepted: 02/12/2016] [Indexed: 11/16/2022]
Abstract
The rapid speed of kill of sarolaner (Simparica™, Zoetis), a novel isoxazoline compound, was demonstrated against three tick species known to infest dogs in Europe or the United States. Efficacy was measured against an existing infestation and against subsequent weekly re-infestations for 35 days after treatment. Dogs were randomly allocated to treatment with a single oral dose of either placebo or sarolaner (2mg/kg) based on pre-treatment host-suitability tick counts. Dogs were infested with approximately 50 unfed adult Ixodes scapularis, Ixodes ricinus or Amblyomma maculatum ticks on Days-2, 7, 14, 21, 28 and 35. Tick counts were conducted at 4 (I. scapularis only), 8, 12 and 24h after treatment on Day 0 and after each subsequent re-infestation. No treatment-related adverse reactions occurred during any of these studies. Dogs in the placebo-treated groups maintained adequate tick infestations (recovery of 20-70% of applied ticks) throughout the duration of the studies. Following treatment, live tick counts were significantly reduced relative to placebo at the 8h post treatment counts indicating that sarolaner started killing existing infestations of ticks rapidly after treatment. Efficacy was 90.1% against I. ricinus, 98.8% against I. scapularis, and 99.2% against A. maculatum within 12h, and 100% efficacy was achieved at 24h after treatment against all three tick species. This speed of kill was maintained throughout the month with ≥95.7%, ≥98.7% and ≥89.6% efficacy against I. scapularis, I. ricinus, and A. maculatum, respectively, at 24h after re-infestation at least through Day 28.
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Affiliation(s)
- Robert H Six
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St. Kalamazoo, MI 49007, USA.
| | - Thomas Geurden
- Zoetis, Veterinary Medicine Research and Development, Mercuriusstraat 20, B-1930 Zaventem, Belgium
| | - Lori Carter
- Stillmeadow Inc. 12852 Park One Drive, Sugar Land, TX 77478, USA
| | | | - A McLoughlin
- Charles River Laboratories, Pre-Clinical Services, Glenamoy Co. Mayo, Ireland
| | - Sean P Mahabir
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St. Kalamazoo, MI 49007, USA
| | - Melanie R Myers
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St. Kalamazoo, MI 49007, USA
| | - Nathalie Slootmans
- Zoetis, Veterinary Medicine Research and Development, Mercuriusstraat 20, B-1930 Zaventem, Belgium
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100
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Tonteri E, Jokelainen P, Matala J, Pusenius J, Vapalahti O. Serological evidence of tick-borne encephalitis virus infection in moose and deer in Finland: sentinels for virus circulation. Parasit Vectors 2016; 9:54. [PMID: 26825371 PMCID: PMC4733276 DOI: 10.1186/s13071-016-1335-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 01/21/2016] [Indexed: 12/30/2022] Open
Abstract
Background The incidence of tick-borne encephalitis (TBE) in humans has increased in Finland, and the disease has emerged in new foci. These foci have been investigated to determine the circulating virus subtype, the tick host species and the ecological parameters, but countrywide epidemiological information on the distribution of TBEV has been limited. Methods In this study, we screened sera from hunter-harvested wild cervids for the presence of antibodies against tick-borne encephalitis virus (TBEV) with a hemagglutination inhibition test. The positive results were confirmed by a neutralisation assay. Results Nine (0.74 %) of 1213 moose, one (0.74 %) of 135 white-tailed deer, and none of the 17 roe deer were found seropositive for TBEV. A close geographical congruence between seropositive cervids and recently reported human TBE cases was observed: nine of the ten seropositive animals were from known endemic areas. Conclusions Our results confirm the local circulation of TBEV in several known endemic areas. One seropositive moose had been shot in an area where human TBE cases have not been reported, suggesting a possible new focus. Moose appear to be a useful sentinel animal for the presence of TBEV in the taiga region.
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Affiliation(s)
- Elina Tonteri
- Department of Virology, University of Helsinki, Faculty of Medicine, Helsinki, Finland.
| | - Pikka Jokelainen
- Department of Veterinary Biosciences, University of Helsinki, Faculty of Veterinary Medicine, Helsinki, Finland. .,Department of Food Hygiene and Environmental Health, University of Helsinki, Faculty of Veterinary Medicine, Helsinki, Finland. .,Department of Basic Veterinary Sciences and Population Medicine, Estonian University of Life Sciences, Tartu, Estonia.
| | - Juho Matala
- Natural Resources Institute Finland (Luke), Management and Production of Renewable Resources, Joensuu, Finland.
| | - Jyrki Pusenius
- Natural Resources Institute Finland (Luke), Management and Production of Renewable Resources, Joensuu, Finland.
| | - Olli Vapalahti
- Department of Virology, University of Helsinki, Faculty of Medicine, Helsinki, Finland. .,Department of Veterinary Biosciences, University of Helsinki, Faculty of Veterinary Medicine, Helsinki, Finland. .,Department of Virology and Immunology, Hospital district of Helsinki and Uusimaa (HUSLAB), Helsinki, Finland.
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