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Jahanroshan N, Dalir‐Naghadeh B, Lotfollahzadeh S, Abdollahi M, Azarmi S, Moosakhani F. Bluetongue outbreak in a sheep flock from Iran. Vet Med Sci 2023; 9:2791-2795. [PMID: 37776265 PMCID: PMC10650254 DOI: 10.1002/vms3.1288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/21/2023] [Accepted: 09/22/2023] [Indexed: 10/02/2023] Open
Abstract
Bluetongue virus (BTV) is an arthropodborne Orbivirus that belongs to the Reoviridae family. Bluetongue is one of the most important diseases of sheep. A flock of 300 Lacon sheep just arrived from France, located in the countryside of Qazvin city, Iran, was examined, in August 2022. In history taking and clinical examination, submandibular oedema (216/300, 72%), fever (216/300, 72%), inappetence (216/300, 72%), stomatitis (216/300, 72%), nasal discharge (90/300, 30%) and lameness (30/300, 10%) were recorded. Foot-and-mouth disease, bluetongue (BT), contagious ecthyma and peste des petits ruminants were the most important differential diagnosis with reference to clinical signs. Tongue scraping samples from four clinically affected sheep were sent to the laboratory for PCR tests and, in all of them, BTV was detected. The affected flock had a history of vaccination with an attenuated live vaccine in the previous 4 months. The morbidity rate, mortality rate and case fatality rate were 72% (216/300), 7% (21/300) and 9.7% (21/216), respectively. This report is the first documented clinical form of BT in sheep from Iran.
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Affiliation(s)
- Navid Jahanroshan
- Department of TheriogenologyFaculty of Veterinary MedicineUniversity of TehranTehranIran
- Private Veterinary PractitionerTehranIran
| | - Bahram Dalir‐Naghadeh
- Department of Internal Medicine and Clinical PathologyFaculty of Veterinary MedicineUrmia UniversityUrmiaIran
| | - Samad Lotfollahzadeh
- Department of Internal MedicineFaculty of Veterinary MedicineUniversity of TehranTehranIran
| | - Mostafa Abdollahi
- Department of Clinical SciencesFaculty of Veterinary MedicineSemnan UniversitySemnanIran
| | - Sareh Azarmi
- Reproduction BiotechnologyFaculty of Veterinary MedicineUniversity of TehranTehranIran
| | - Farhad Moosakhani
- Department of Microbiology and ImmunologyFaculty of Veterinary MedicineIslamic Azad UniversityKarajIran
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Pourcelot M, da Silva Moraes RA, Lacour S, Fablet A, Caignard G, Vitour D. Activation of Inflammasome during Bluetongue Virus Infection. Pathogens 2023; 12:801. [PMID: 37375491 DOI: 10.3390/pathogens12060801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/02/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
Bluetongue virus (BTV), a double-stranded RNA virus belonging to the Sedoreoviridae family, provokes an economically important disease in ruminants. In this study, we show that the production of activated caspase-1 and interleukin 1 beta (IL-1β) is induced in BTV-infected cells. This response seems to require virus replication since a UV-inactivated virus is unable to activate this pathway. In NLRP3-/- cells, BTV could not trigger further IL-1β synthesis, indicating that it occurs through NLRP3 inflammasome activation. Interestingly, we observed differential activation levels in bovine endothelial cells depending on the tissue origin. In particular, inflammasome activation was stronger in umbilical cord cells, suggesting that these cells are more prone to induce the inflammasome upon BTV infection. Finally, the strength of the inflammasome activation also depends on the BTV strain, which points to the importance of viral origin in inflammasome modulation. This work reports the crucial role of BTV in the activation of the NLRP3 inflammasome and further shows that this activation relies on BTV replication, strains, and cell types, thus providing new insights into BTV pathogenesis.
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Affiliation(s)
- Marie Pourcelot
- UMR Virologie, Laboratory for Animal Health, INRAE, Ecole Nationale Vétérinaire d'Alfort, ANSES, 94703 Maisons-Alfort, France
| | - Rayane Amaral da Silva Moraes
- UMR Virologie, Laboratory for Animal Health, INRAE, Ecole Nationale Vétérinaire d'Alfort, ANSES, 94703 Maisons-Alfort, France
| | - Sandrine Lacour
- UMR Virologie, Laboratory for Animal Health, INRAE, Ecole Nationale Vétérinaire d'Alfort, ANSES, 94703 Maisons-Alfort, France
| | - Aurore Fablet
- UMR Virologie, Laboratory for Animal Health, INRAE, Ecole Nationale Vétérinaire d'Alfort, ANSES, 94703 Maisons-Alfort, France
| | - Grégory Caignard
- UMR Virologie, Laboratory for Animal Health, INRAE, Ecole Nationale Vétérinaire d'Alfort, ANSES, 94703 Maisons-Alfort, France
| | - Damien Vitour
- UMR Virologie, Laboratory for Animal Health, INRAE, Ecole Nationale Vétérinaire d'Alfort, ANSES, 94703 Maisons-Alfort, France
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Yang QL, Zhang SW, Qiu SY, Zhang Q, Chen Q, Niu B. Spatio-temporal and trade export risk analysis of bluetongue disease in France: A case study of China. Front Vet Sci 2022; 9:955366. [PMID: 36406078 PMCID: PMC9669432 DOI: 10.3389/fvets.2022.955366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 10/11/2022] [Indexed: 01/25/2023] Open
Abstract
Bluetongue disease (BT) is a viral disease that can be introduced through imported animals and animal products, affecting local animal husbandry. In this study, the spatial and temporal patterns of BT outbreaks (outbreak: a BT infection in cattle, sheep, or goats on a farm, involving at least one infected animal) in France were analyzed and the risk of introducing bluetongue virus (BTV) into countries through trade was assessed. A spatiotemporal analysis of BT reported during the study period (2015-2018) showed that there were clustered outbreaks of BT in France in 2016 and 2017, with outbreaks concentrated from August to December. The outbreak moved eastward from the center of mainland France to surrounding countries. A semi-quantitative risk analysis framework was established by combining the likelihood assessment and consequence analysis of introducing BTV into trading countries through trade. Exemplified by China, the research showed that in the analysis of the likelihood of BTV from France being introduced into trading countries through live cattle trade, China imports a large number of live cattle, bringing high risks. The likelihood of introducing bovine semen into trading countries was similar to that of live cattle, but the harm caused by the trade in live cattle was higher than that caused by the trade in bovine semen. This risk analysis framework can provide a reference for other countries to quickly assess the risk of bluetongue transmission in import and export trade.
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Affiliation(s)
- Qiao-ling Yang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, China,School of Life Sciences, Shanghai University, Shanghai, China
| | - Shu-wen Zhang
- School of Life Sciences, Shanghai University, Shanghai, China
| | - Song-yin Qiu
- Chinese Academy of Inspection and Quarantine, Beijing, China
| | - Qiang Zhang
- Technology Center of Animal, Plant and Food Inspection and Quarantine, Shanghai, China
| | - Qin Chen
- School of Life Sciences, Shanghai University, Shanghai, China,*Correspondence: Qin Chen
| | - Bing Niu
- School of Life Sciences, Shanghai University, Shanghai, China,Bing Niu
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Wernike K, Fischer L, Holsteg M, Aebischer A, Petrov A, Marquart K, Schotte U, Schön J, Hoffmann D, Hechinger S, Neubauer-Juric A, Blicke J, Mettenleiter TC, Beer M. Serological screening in wild ruminants in Germany, 2021/22: No evidence of SARS-CoV-2, bluetongue virus or pestivirus spread but high seroprevalences against Schmallenberg virus. Transbound Emerg Dis 2022; 69:e3289-e3296. [PMID: 35585653 PMCID: PMC9348064 DOI: 10.1111/tbed.14600] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 05/13/2022] [Accepted: 05/15/2022] [Indexed: 11/30/2022]
Abstract
Wildlife animals may be susceptible to multiple infectious agents of public health or veterinary relevance, thereby potentially forming a reservoir that bears the constant risk of re‐introduction into the human or livestock population. Here, we serologically investigated 493 wild ruminant samples collected in the 2021/2022 hunting season in Germany for the presence of antibodies against the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) and four viruses pathogenic to domestic ruminants, namely, the orthobunyavirus Schmallenberg virus (SBV), the reovirus bluetongue virus (BTV) and ruminant pestiviruses like bovine viral diarrhoea virus or border disease virus. The animal species comprised fallow deer, red deer, roe deer, mouflon and wisent. For coronavirus serology, additional 307 fallow, roe and red deer samples collected between 2017 and 2020 at three military training areas were included. While antibodies against SBV could be detected in about 13.6% of the samples collected in 2021/2022, only one fallow deer of unknown age tested positive for anti‐BTV antibodies, and all samples reacted negative for antibodies against ruminant pestiviruses. In an ELISA based on the receptor‐binding domain (RBD) of SARS‐CoV‐2, 25 out of 493 (5.1%) samples collected in autumn and winter 2021/2022 scored positive. This sero‐reactivity could not be confirmed by the highly specific virus neutralisation test, occurred also in 2017, 2018 and 2019, that is, prior to the human SARS‐CoV‐2 pandemic, and was likewise observed against the RBD of the related SARS‐CoV‐1. Therefore, the SARS‐CoV‐2 sero‐reactivity was most likely induced by another hitherto unknown deer virus belonging to the subgenus Sarbecovirus of betacoronaviruses.
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Affiliation(s)
- Kerstin Wernike
- Friedrich-Loeffler-Institut, Greifswald - Insel Riems, Germany
| | - Luisa Fischer
- State Agency for Nature, Environment and Consumer Protection North Rhine-Westphalia, Wildlife Research Institute, Bonn, Germany
| | - Mark Holsteg
- Chamber of Agriculture for North Rhine-Westphalia, Bovine Health Service, Bad Sassendorf, Germany
| | | | - Anja Petrov
- Central Institute of the Bundeswehr Medical Service Kiel, Kronshagen, Germany
| | - Katharina Marquart
- Central Institute of the Bundeswehr Medical Service Kiel, Kronshagen, Germany
| | - Ulrich Schotte
- Central Institute of the Bundeswehr Medical Service Kiel, Kronshagen, Germany
| | - Jacob Schön
- Friedrich-Loeffler-Institut, Greifswald - Insel Riems, Germany
| | - Donata Hoffmann
- Friedrich-Loeffler-Institut, Greifswald - Insel Riems, Germany
| | | | | | - Julia Blicke
- Ministry of Climate Protection, Environment, Energy and Mobility, Mainz, Germany
| | | | - Martin Beer
- Friedrich-Loeffler-Institut, Greifswald - Insel Riems, Germany
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Bluetongue Virus Infection of Goats: Re-Emerged European Serotype 8 vs. Two Atypical Serotypes. Viruses 2022; 14:v14051034. [PMID: 35632775 PMCID: PMC9144285 DOI: 10.3390/v14051034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/29/2022] [Accepted: 05/10/2022] [Indexed: 01/27/2023] Open
Abstract
In recent years, numerous atypical Bluetongue virus (BTV) strains have been discovered all around the world. Atypical BTV strains are phylogenetically distinct from the classical BTV serotypes 1–24 and differ in terms of several biological features. For the first time, the atypical strains BTV-25-GER2018 and BTV-33-MNG3/2016 as well as the re-emerged classical strain BTV-8-GER2018 were evaluated comparatively in a pathogenesis study in goats—the natural host of atypical BTV. A substantial number of in-contact animals were included in this study to detect potential contact transmissions of the virus. After infection, EDTA blood, ocular, nasal and oral swab samples as well as serum were collected regularly and were used for virological and serological analyses, respectively. Our study showed differences in the immunological reaction between the two atypical BTV strains (no group-specific antibody detection) and the classical BTV strain BTV-8-GER2018 (group-specific antibody detection). Furthermore, we observed an increase in the total WBC count (neutrophils and lymphocytes) in goats infected with the atypical BTV strains. No horizontal transmission was seen for all three strains. Our study suggests that the atypical BTVs used in the trial differ from classical BTVs in their immunopathogenesis. However, no evidence of direct contact transmission was found.
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A Qualitative Risk Assessment for Bluetongue Disease and African Horse Sickness: The Risk of Entry and Exposure at a UK Zoo. Viruses 2022; 14:v14030502. [PMID: 35336912 PMCID: PMC8950286 DOI: 10.3390/v14030502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/25/2022] [Accepted: 02/25/2022] [Indexed: 12/10/2022] Open
Abstract
Bluetongue virus (BTV) and African horse sickness virus (AHSV) cause economically important diseases that are currently exotic to the United Kingdom (UK), but have significant potential for introduction and onward transmission. Given the susceptibility of animals kept in zoo collections to vector-borne diseases, a qualitative risk assessment for the introduction of BTV and AHSV to ZSL London Zoo was performed. Risk pathways for each virus were identified and assessed using published literature, animal import data and outputs from epidemiological models. Direct imports of infected animals, as well as wind-borne infected Culicoides, were considered as routes of incursion. The proximity of ongoing disease events in mainland Europe and proven capability of transmission to the UK places ZSL London Zoo at higher risk of BTV release and exposure (estimated as low to medium) than AHSV (estimated as very low to low). The recent long-range expansion of AHSV into Thailand from southern Africa highlights the need for vector competence studies of Palearctic Culicoides for AHSV to assess the risk of transmission in this region.
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Point of care diagnostics and non-invasive sampling strategy: a review on major advances in veterinary diagnostics. ACTA VET BRNO 2022. [DOI: 10.2754/avb202291010017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The use of point of care diagnostics (POCD) in animal diseases has steadily increased over the years since its introduction. Its potential application to diagnose infectious diseases in remote and resource limited settings have made it an ideal diagnostic in animal disease diagnosis and surveillance. The rapid increase in incidence of emerging infectious diseases requires urgent attention where POCD could be indispensable tools for immediate detection and early warning of a potential pathogen. The advantages of being rapid, easily affordable and the ability to diagnose an infectious disease on spot has driven an intense effort to refine and build on the existing technologies to generate advanced POCD with incremental improvements in analytical performance to diagnose a broad spectrum of animal diseases. The rural communities in developing countries are invariably affected by the burden of infectious animal diseases due to limited access to diagnostics and animal health personnel. Besides, the alarming trend of emerging and transboundary diseases with pathogen spill-overs at livestock-wildlife interfaces has been identified as a threat to the domestic population and wildlife conservation. Under such circumstances, POCD coupled with non-invasive sampling techniques could be successfully deployed at field level without the use of sophisticated laboratory infrastructures. This review illustrates the current and prospective POCD for existing and emerging animal diseases, the status of non-invasive sampling strategies for animal diseases, and the tremendous potential of POCD to uplift the status of global animal health care.
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Occurrence of Biting Midges (Diptera: Culicoides) on Dairy Farms in Eastern Slovakia in Relation to Abiotic Factors. FOLIA VETERINARIA 2021. [DOI: 10.2478/fv-2021-0037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Within the scope of our research, we have performed 59 trapping sessions and collected 15,756 biting midges from 20 species at four farms (Kluknava, Ostrov, Turňa nad Bodovou and Zemplínska Teplica), The most frequent types of captured insects were representatives of the Avaritia subgenus, C. obsoletus/C. scoticus, representing on average 85.1 % (13,295 individuals) of the fauna of the biting midges, with the exception of the farm in Ostrov where this group represented only 41.7 % of the fauna. At this particular farm, the most frequently trapped insects belonged to the Culicoides subgenus (54.1 %), in particular the C. bysta, C. lupicaris, C. newsteadi, C. Pulicaris and C. Punctatus species. During the trapping sessions, we monitored factors affecting the number of trapped biting midges, such as the temperature, relative air humidity and airflow rate: the air temperature during the trapping of the biting midges ranged from 9.8 to 26.2 °C; the relative air humidity ranged from 35.1 to 100 %; and the air flow rate ranged from no wind to a wind velocity of 8.2 m.s-1. However, in the final evaluation, we failed to observe a statistically significant correlation between the air flow and the number of trapped biting midges. The largest amounts of biting midges were trapped at temperatures ranging from 15.8 to 24.6 °C and at a relative air humidity ranging from 54.2 % to 68.6 %. While monitoring the seasonal dynamics of the physiological conditions of biting midge females at the selected farms, we confirmed that during the period from June to August, the most frequently trapped females were parous (50.1 %; 7,826 individuals). In addition, nulliparous females comprised 43.8 % (6,842 individuals) and were continuously trapped throughout the season (April— November).
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De Clercq K, Vandaele L, Vanbinst T, Riou M, Deblauwe I, Wesselingh W, Pinard A, Van Eetvelde M, Boulesteix O, Leemans B, Gélineau R, Vercauteren G, Van der Heyden S, Beckers JF, Saegerman C, Sammin D, de Kruif A, De Leeuw I. Transmission of Bluetongue Virus Serotype 8 by Artificial Insemination with Frozen-Thawed Semen from Naturally Infected Bulls. Viruses 2021; 13:v13040652. [PMID: 33918924 PMCID: PMC8069090 DOI: 10.3390/v13040652] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/31/2021] [Accepted: 04/07/2021] [Indexed: 12/31/2022] Open
Abstract
Transmission of bluetongue (BT) virus serotype 8 (BTV-8) via artificial insemination of contaminated frozen semen from naturally infected bulls was investigated in two independent experiments. Healthy, BT negative heifers were hormonally synchronized and artificially inseminated at oestrus. In total, six groups of three heifers received semen from four batches derived from three bulls naturally infected with BTV-8. Each experiment included one control heifer that was not inseminated and that remained BT negative throughout. BTV viraemia and seroconversion were determined in 8 out of 18 inseminated heifers, and BTV was isolated from five of these animals. These eight heifers only displayed mild clinical signs of BT, if any at all, but six of them experienced pregnancy loss between weeks four and eight of gestation, and five of them became BT PCR and antibody positive. The other two infected heifers gave birth at term to two healthy and BT negative calves. The BT viral load varied among the semen batches used and this had a significant impact on the infection rate, the time of onset of viraemia post artificial insemination, and the gestational stage at which pregnancy loss occurred. These results, which confirm unusual features of BTV-8 infection, should not be extrapolated to infection with other BTV strains without thorough evaluation. This study also adds weight to the hypothesis that the re-emergence of BTV-8 in France in 2015 may be attributable to the use of contaminated bovine semen.
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Affiliation(s)
- Kris De Clercq
- Unit of Exotic and Particular Diseases, Scientific Directorate Infectious Diseases in Animals, Sciensano, 1180 Brussels, Belgium; (I.D.L.)
- Correspondence:
| | - Leen Vandaele
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, 9820 Merelbeke, Belgium; (L.V.); (W.W.); (M.V.E.); (B.L.); (A.d.K.)
| | - Tine Vanbinst
- Unit of Exotic and Particular Diseases, Scientific Directorate Infectious Diseases in Animals, Sciensano, 1180 Brussels, Belgium; (I.D.L.)
| | - Mickaël Riou
- UE-1277 Plateforme d’Infectiologie Expérimentale (PFIE), Centre de Recherche Val de Loire, Institut National de Recherche Pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), 37380 Nouzilly, France; (M.R.); (A.P.); (O.B.); (R.G.)
| | - Isra Deblauwe
- The Unit of Entomology, Department of Biomedical Sciences, Institute of Tropical Medicine, 2000 Antwerp, Belgium;
| | - Wendy Wesselingh
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, 9820 Merelbeke, Belgium; (L.V.); (W.W.); (M.V.E.); (B.L.); (A.d.K.)
| | - Anne Pinard
- UE-1277 Plateforme d’Infectiologie Expérimentale (PFIE), Centre de Recherche Val de Loire, Institut National de Recherche Pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), 37380 Nouzilly, France; (M.R.); (A.P.); (O.B.); (R.G.)
| | - Mieke Van Eetvelde
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, 9820 Merelbeke, Belgium; (L.V.); (W.W.); (M.V.E.); (B.L.); (A.d.K.)
| | - Olivier Boulesteix
- UE-1277 Plateforme d’Infectiologie Expérimentale (PFIE), Centre de Recherche Val de Loire, Institut National de Recherche Pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), 37380 Nouzilly, France; (M.R.); (A.P.); (O.B.); (R.G.)
| | - Bart Leemans
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, 9820 Merelbeke, Belgium; (L.V.); (W.W.); (M.V.E.); (B.L.); (A.d.K.)
| | - Robert Gélineau
- UE-1277 Plateforme d’Infectiologie Expérimentale (PFIE), Centre de Recherche Val de Loire, Institut National de Recherche Pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), 37380 Nouzilly, France; (M.R.); (A.P.); (O.B.); (R.G.)
| | - Griet Vercauteren
- Department of Pathology, Bacteriology and Poultry Diseases, 9820 Merelbeke, Belgium; (G.V.); (S.V.d.H.)
| | - Sara Van der Heyden
- Department of Pathology, Bacteriology and Poultry Diseases, 9820 Merelbeke, Belgium; (G.V.); (S.V.d.H.)
| | - Jean-François Beckers
- Département des Sciences Fonctionnelles (DSF), Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, 4000 Liège, Belgium;
| | - Claude Saegerman
- Research Unit in Epidemiology and Risk Analysis Applied to Veterinary Sciences (UREAR-ULg), Fundamental and Applied Research for Animal and Health (FARAH) Center, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, 4130 Liege, Belgium;
| | - Donal Sammin
- Department of Agriculture Food and the Marine Laboratories, Backweston, W23 X3PH Co. Kildare, Ireland;
| | - Aart de Kruif
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, 9820 Merelbeke, Belgium; (L.V.); (W.W.); (M.V.E.); (B.L.); (A.d.K.)
| | - Ilse De Leeuw
- Unit of Exotic and Particular Diseases, Scientific Directorate Infectious Diseases in Animals, Sciensano, 1180 Brussels, Belgium; (I.D.L.)
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Nearly Complete Genome Sequences of Two Bluetongue Viruses Isolated during the 2020 Outbreak in the Grand Duchy of Luxembourg. Microbiol Resour Announc 2021; 10:10/14/e00210-21. [PMID: 33833026 PMCID: PMC8032468 DOI: 10.1128/mra.00210-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Bluetongue is one of the major diseases of ruminants listed by the World Organisation for Animal Health. Bluetongue virus serotype 8 (BTV-8) has been considered enzootic in France since 2018. Here, we report the nearly complete genome sequences of two BTV-8 isolates from the 2020 outbreak in the Grand Duchy of Luxembourg. Bluetongue is one of the major diseases of ruminants listed by the World Organisation for Animal Health. Bluetongue virus serotype 8 (BTV-8) has been considered enzootic in France since 2018. Here, we report the nearly complete genome sequences of two BTV-8 isolates from the 2020 outbreak in the Grand Duchy of Luxembourg.
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Mignotte A, Garros C, Dellicour S, Jacquot M, Gilbert M, Gardès L, Balenghien T, Duhayon M, Rakotoarivony I, de Wavrechin M, Huber K. High dispersal capacity of Culicoides obsoletus (Diptera: Ceratopogonidae), vector of bluetongue and Schmallenberg viruses, revealed by landscape genetic analyses. Parasit Vectors 2021; 14:93. [PMID: 33536057 PMCID: PMC7860033 DOI: 10.1186/s13071-020-04522-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 12/04/2020] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND In the last two decades, recurrent epizootics of bluetongue virus and Schmallenberg virus have been reported in the western Palearctic region. These viruses affect domestic cattle, sheep, goats and wild ruminants and are transmitted by native hematophagous midges of the genus Culicoides (Diptera: Ceratopogonidae). Culicoides dispersal is known to be stratified, i.e. due to a combination of dispersal processes occurring actively at short distances and passively or semi-actively at long distances, allowing individuals to jump hundreds of kilometers. METHODS Here, we aim to identify the environmental factors that promote or limit gene flow of Culicoides obsoletus, an abundant and widespread vector species in Europe, using an innovative framework integrating spatial, population genetics and statistical approaches. A total of 348 individuals were sampled in 46 sites in France and were genotyped using 13 newly designed microsatellite markers. RESULTS We found low genetic differentiation and a weak population structure for C. obsoletus across the country. Using three complementary inter-individual genetic distances, we did not detect any significant isolation by distance, but did detect significant anisotropic isolation by distance on a north-south axis. We employed a multiple regression on distance matrices approach to investigate the correlation between genetic and environmental distances. Among all the environmental factors that were tested, only cattle density seems to have an impact on C. obsoletus gene flow. CONCLUSIONS The high dispersal capacity of C. obsoletus over land found in the present study calls for a re-evaluation of the impact of Culicoides on virus dispersal, and highlights the urgent need to better integrate molecular, spatial and statistical information to guide vector-borne disease control.
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Affiliation(s)
- Antoine Mignotte
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 34398 Montpellier, France
| | - Claire Garros
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 34398 Montpellier, France
| | - Simon Dellicour
- Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, CP160/12, 50, av. FD Roosevelt, 1050 Bruxelles, Belgium
- Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Maude Jacquot
- Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, CP160/12, 50, av. FD Roosevelt, 1050 Bruxelles, Belgium
- UMR EPIA, Université Clermont Auvergne, INRAE, VetAgro Sup, 63122 Saint-Genès-Champanelle, France
| | - Marius Gilbert
- Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, CP160/12, 50, av. FD Roosevelt, 1050 Bruxelles, Belgium
| | - Laetitia Gardès
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 97170 Petit-Bourg, Guadeloupe France
| | - Thomas Balenghien
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 10100 Rabat, Morocco
- Unité Microbiologie, immunologie et maladies contagieuses, Institut Agronomique et Vétérinaire Hassan II, 10100 Rabat-Instituts, Morocco
| | - Maxime Duhayon
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 34398 Montpellier, France
| | - Ignace Rakotoarivony
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 34398 Montpellier, France
| | - Maïa de Wavrechin
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
- Cirad, UMR ASTRE, 34398 Montpellier, France
| | - Karine Huber
- ASTRE, Univ Montpellier, Cirad, INRAE, Montpellier, France
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12
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Möhlmann TWR, Keeling MJ, Wennergren U, Favia G, Santman-Berends I, Takken W, Koenraadt CJM, Brand SPC. Biting midge dynamics and bluetongue transmission: a multiscale model linking catch data with climate and disease outbreaks. Sci Rep 2021; 11:1892. [PMID: 33479304 PMCID: PMC7820592 DOI: 10.1038/s41598-021-81096-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 04/16/2020] [Indexed: 01/29/2023] Open
Abstract
Bluetongue virus (BTV) serotype 8 has been circulating in Europe since a major outbreak occurred in 2006, causing economic losses to livestock farms. The unpredictability of the biting activity of midges that transmit BTV implies difficulty in computing accurate transmission models. This study uniquely integrates field collections of midges at a range of European latitudes (in Sweden, The Netherlands, and Italy), with a multi-scale modelling approach. We inferred the environmental factors that influence the dynamics of midge catching, and then directly linked predicted midge catches to BTV transmission dynamics. Catch predictions were linked to the observed prevalence amongst sentinel cattle during the 2007 BTV outbreak in The Netherlands using a dynamic transmission model. We were able to directly infer a scaling parameter between daily midge catch predictions and the true biting rate per cow per day. Compared to biting rate per cow per day the scaling parameter was around 50% of 24 h midge catches with traps. Extending the estimated biting rate across Europe, for different seasons and years, indicated that whilst intensity of transmission is expected to vary widely from herd to herd, around 95% of naïve herds in western Europe have been at risk of sustained transmission over the last 15 years.
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Affiliation(s)
- Tim W R Möhlmann
- Laboratory of Entomology, Wageningen University and Research, P. O. Box 16, 1700 AA, Wageningen, The Netherlands
- IFM Theory and Modelling, Linköping University, 581 83, Linköping, Sweden
| | - Matt J Keeling
- School of Life Sciences, University of Warwick, Coventry, UK
- Zeeman Institute, University of Warwick, Coventry, UK
- Mathematics Institute, University of Warwick, Coventry, UK
| | - Uno Wennergren
- IFM Theory and Modelling, Linköping University, 581 83, Linköping, Sweden
| | - Guido Favia
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032, Camerino, Italy
| | | | - Willem Takken
- Laboratory of Entomology, Wageningen University and Research, P. O. Box 16, 1700 AA, Wageningen, The Netherlands
| | - Constantianus J M Koenraadt
- Laboratory of Entomology, Wageningen University and Research, P. O. Box 16, 1700 AA, Wageningen, The Netherlands
| | - Samuel P C Brand
- School of Life Sciences, University of Warwick, Coventry, UK.
- Zeeman Institute, University of Warwick, Coventry, UK.
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13
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Grace KEF, Papadopoulou C, Floyd T, Avigad R, Collins S, White E, Batten C, Flannery J, Gubbins S, Carpenter ST. Risk-based surveillance for bluetongue virus in cattle on the south coast of England in 2017 and 2018. Vet Rec 2020; 187:e96. [PMID: 32917835 PMCID: PMC7786256 DOI: 10.1136/vr.106016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/01/2020] [Accepted: 07/13/2020] [Indexed: 01/05/2023]
Abstract
BACKGROUND Bluetongue (BT) is a viral disease of ruminants and camelids which can have a significant impact on animal health and welfare and cause severe economic loss. The UK has been officially free of bluetongue virus (BTV) since 2011. In 2015, BTV-8 re-emerged in France and since then BTV has been spreading throughout Europe. In response to this outbreak, risk-based active surveillance was carried out at the end of the vector seasons in 2017 and 2018 to assess the risk of incursion of BTV into Great Britain. METHOD Atmospheric dispersion modelling identified counties on the south coast of England at higher risk of an incursion. Blood samples were collected from cattle in five counties based on a sample size designed to detect at least one positive if the prevalence was 5 per cent or greater, with 95 per cent confidence. RESULTS No virus was detected in the 478 samples collected from 32 farms at the end of the 2017 vector season or in the 646 samples collected from 43 farms at the end of the 2018 vector season, when tested by RT-qPCR. CONCLUSION The negative results from this risk-based survey provided evidence to support the continuation of the UK's official BTV-free status.
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Affiliation(s)
| | | | - Tobias Floyd
- Pathology, Animal and Plant Health Agency, Addlestone, UK
| | - Rachelle Avigad
- Department of Epidemiological Sciences, APHA, Addlestone, UK
| | - Steve Collins
- Information Management and Technology, APHA, Worcester, UK
| | | | - Carrie Batten
- The Non-Vesicular Reference Laboratories, Pirbright Institute, Pirbright, Surrey, UK
| | - John Flannery
- The Non-Vesicular Reference Laboratories, Pirbright Institute, Pirbright, Surrey, UK
| | - Simon Gubbins
- Transmission Biology, The Pirbright Institute, Pirbright, Surrey, UK
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14
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Wilson WC, Mitzel D, Savini G, Zientara S, Richt JA. Editorial: Emerging Arboviruses. Front Vet Sci 2020; 7:593872. [PMID: 33240963 PMCID: PMC7677233 DOI: 10.3389/fvets.2020.593872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 09/23/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- William C Wilson
- Arthropod-Borne Animal Diseases Research Unit, United States Department of Agriculture (USDA), Agricultural Research Service, Manhattan, KS, United States
| | - Dana Mitzel
- Arthropod-Borne Animal Diseases Research Unit, United States Department of Agriculture (USDA), Agricultural Research Service, Manhattan, KS, United States
| | - Giovanni Savini
- OIE Reference Laboratory for Bluetongue, IZS Istituto Zooprofilattico Sperimentale, Teramo, Italy
| | - Stéphan Zientara
- French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Maisons Alfort, France
| | - Juergen A Richt
- Department of Diagnostic Medicine/Pathobiology and Center of Excellence for Emerging and Zoonotic Animal Diseases, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
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15
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[Emerging vectorial diseases: West Nile fever, Bluetongue and Schmallenberg]. BULLETIN DE L ACADEMIE NATIONALE DE MEDECINE 2020; 204:992-999. [PMID: 33012789 PMCID: PMC7521384 DOI: 10.1016/j.banm.2020.09.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 09/10/2020] [Indexed: 11/30/2022]
Abstract
L’augmentation des échanges internationaux, au cours de ces trente dernières années, les modifications climatiques engendrées par la révolution industrielle, les perturbations des écosystèmes, … sont quelques-uns des facteurs susceptibles d’expliquer la dynamique d’émergence de maladies dans les régions du monde où elles n’étaient pas présentes. Ainsi en 1999, le virus West Nile a été introduit sur le continent américain où il s’est disséminé à grand vitesse. Aux États-Unis, 2 381 décès et plus de 25 000 formes neuro-invasives ont été enregistrés chez l’Homme de 1999 à 2019. Dans le domaine des maladies animales, deux virus ont défrayé la chronique en Europe : le virus de la fièvre catarrhale ovine (FCO) et le virus Schmallenberg (SBV). Le virus de la FCO, jusqu’alors absent d’Europe a été introduit en 1999. De nombreux sérotypes (1, 2, 4,6, 8, 9, 25, 27) ont depuis cette date, été identifiés dans l’Union Européenne. Le virus Schmallenberg, quant à lui, a été identifié en 2011 dans le nord de l’Allemagne et a rapidement diffusé sur tout le continent. Ce virus n’avait jamais été identifié dans le monde jusqu’à alors. Ces trois virus (WNV, FCO et SBV) sont transmis par des arthropodes vecteurs (moustiques et culicoïdes). Ces émergences illustrent bien les défis auxquels nos pays seront confrontés dans les années à venir, en santé publique, humaine et vétérinaire.
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16
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Werner D, Groschupp S, Bauer C, Kampen H. Breeding Habitat Preferences of Major Culicoides Species (Diptera: Ceratopogonidae) in Germany. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17145000. [PMID: 32664561 PMCID: PMC7400431 DOI: 10.3390/ijerph17145000] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/01/2020] [Accepted: 07/06/2020] [Indexed: 01/14/2023]
Abstract
Biting midges of the genus Culicoides (Diptera, Ceratopognidae) are demonstrably or putatively involved in the transmission of both bluetongue (BTV) and Schmallenberg viruses (SBV) in Central Europe. Although these insects are ubiquitous in Europe, relatively little is known about their requirements in terms of breeding habitats and substrates. Culicoides species composition and relative abundance in potential breeding habitats were therefore studied at various locations in Northeastern Germany and one location in Western Germany by emergence trap collections. Forty-three potential breeding sites were analyzed in ten landscape structures, with 28,091 adult biting midges emerging from them. Among these, 2116 specimens belonged to the genus Culicoides. Species of the culicoid subgenus Avaritia were most abundant (70.6% of all specimens) and widespread (91.6% of all sites), while the subgenus Culicoides accounted for 15.6% of the specimens registered but emerged from 70.8% of all sites sampled. Culicoides species of other subgenera were collected in 75.0% of all studied sites, with a relative abundance of 8.7%. The results indicate that various types of dung, but probably also some landscape habitats, offer suitable substrates for the development of potential Culicoides vector species. Adaptations in dung management on farms and landscape design and use might therefore be appropriate approaches to reduce the risk of BTV or SBV transmission.
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Affiliation(s)
- Doreen Werner
- Research Area 2 “Land Use and Governance”, Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany;
- Correspondence: ; Tel.: +49-33432-82-363
| | - Sarah Groschupp
- Research Area 2 “Land Use and Governance”, Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany;
| | - Christian Bauer
- Working Group “Epidemiology”, Institute of Parasitology, Justus Liebig University, 35392 Giessen, Germany;
| | - Helge Kampen
- Institute of Infectology, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, 17493 Greifswald, Germany;
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17
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Flannery J, Frost L, Fay P, Hicks H, Henstock M, Smreczak M, Orłowska A, Rajko-Nenow P, Darpel K, Batten C. BTV-14 Infection in Sheep Elicits Viraemia with Mild Clinical Symptoms. Microorganisms 2020; 8:E892. [PMID: 32545731 PMCID: PMC7355590 DOI: 10.3390/microorganisms8060892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 06/09/2020] [Accepted: 06/11/2020] [Indexed: 11/16/2022] Open
Abstract
In 2011, Bluetongue virus serotype 14 (BTV-14) was detected in Russia during routine surveillance, and was subsequently found in a number of European countries. The strain had high sequence similarity to a BTV-14 vaccine strain. We aimed to determine the risk of this BTV-14 strain causing disease in a UK sheep breed. Four Poll Dorset sheep were infected with a Polish isolate of BTV-14 and infection kinetics were monitored over 28 days. BTV RNA was detected in EDTA blood by 4 days post-infection (dpi) and remained detectable at 28 days post-infection (dpi). Peak viraemia occurred at 6 and 7 dpi with Ct values ranging between 24.6 and 27.3 in all infected animals. BTV antibodies were detected by 10 dpi using a commercial ELISA and neutralising antibodies were detected from 10 dpi. BTV was isolated between 6 and 12 dpi. All infected sheep developed mild clinical signs such as reddening of conjunctiva and mucosal membranes, with one sheep demonstrating more overt clinical signs. Two uninoculated control animals remained clinically healthy and did not have detectable BTV RNA or antibodies. The overall mild clinical symptoms caused by this BTV-14 in this highly susceptible sheep breed were in accordance with the asymptomatic infections observed in the affected countries.
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Affiliation(s)
- John Flannery
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Lorraine Frost
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Petra Fay
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Hayley Hicks
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Mark Henstock
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Marcin Smreczak
- Department of Virology, National Veterinary Research Institute, 24-100 Puławy, Poland; (M.S.); (A.O.)
| | - Anna Orłowska
- Department of Virology, National Veterinary Research Institute, 24-100 Puławy, Poland; (M.S.); (A.O.)
| | - Paulina Rajko-Nenow
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Karin Darpel
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
| | - Carrie Batten
- Non-Vesicular Reference Laboratories, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (L.F.); (P.F.); (H.H.); (M.H.); (P.R.-N.); (K.D.); (C.B.)
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18
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Pascall DJ, Nomikou K, Bréard E, Zientara S, Filipe ADS, Hoffmann B, Jacquot M, Singer JB, De Clercq K, Bøtner A, Sailleau C, Viarouge C, Batten C, Puggioni G, Ligios C, Savini G, van Rijn PA, Mertens PPC, Biek R, Palmarini M. "Frozen evolution" of an RNA virus suggests accidental release as a potential cause of arbovirus re-emergence. PLoS Biol 2020; 18:e3000673. [PMID: 32343693 PMCID: PMC7188197 DOI: 10.1371/journal.pbio.3000673] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 03/24/2020] [Indexed: 12/12/2022] Open
Abstract
The mechanisms underlying virus emergence are rarely well understood, making the appearance of outbreaks largely unpredictable. Bluetongue virus serotype 8 (BTV-8), an arthropod-borne virus of ruminants, emerged in livestock in northern Europe in 2006, spreading to most European countries by 2009 and causing losses of billions of euros. Although the outbreak was successfully controlled through vaccination by early 2010, puzzlingly, a closely related BTV-8 strain re-emerged in France in 2015, triggering a second outbreak that is still ongoing. The origin of this virus and the mechanisms underlying its re-emergence are unknown. Here, we performed phylogenetic analyses of 164 whole BTV-8 genomes sampled throughout the two outbreaks. We demonstrate consistent clock-like virus evolution during both epizootics but found negligible evolutionary change between them. We estimate that the ancestor of the second outbreak dates from the height of the first outbreak in 2008. This implies that the virus had not been replicating for multiple years prior to its re-emergence in 2015. Given the absence of any known natural mechanism that could explain BTV-8 persistence over this long period without replication, we hypothesise that the second outbreak could have been initiated by accidental exposure of livestock to frozen material contaminated with virus from approximately 2008. Our work highlights new targets for pathogen surveillance programmes in livestock and illustrates the power of genomic epidemiology to identify pathways of infectious disease emergence.
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Affiliation(s)
- David J. Pascall
- Institute of Biodiversity, Animal Health and Comparative Medicine, Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, United Kingdom
| | - Kyriaki Nomikou
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
- The School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, United Kingdom
| | - Emmanuel Bréard
- UMR Virologie, INRA, École Nationale Vétérinaire d’Alfort, Laboratoire de Santé Animale d’Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Stephan Zientara
- UMR Virologie, INRA, École Nationale Vétérinaire d’Alfort, Laboratoire de Santé Animale d’Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Ana da Silva Filipe
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Bernd Hoffmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Maude Jacquot
- Spatial Epidemiology Lab (SpELL), University of Brussels, Brussels, Belgium
- INRAE-VetAgro Sup, UMR Epidemiology of Animal and Zoonotic Diseases, Saint Genès-Champanelle, France
| | - Joshua B. Singer
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Kris De Clercq
- Infectious Diseases in Animals, Exotic and Particular Diseases, Sciensano, Brussels, Belgium
| | - Anette Bøtner
- Section for Veterinary Clinical Microbiology, Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark
| | - Corinne Sailleau
- UMR Virologie, INRA, École Nationale Vétérinaire d’Alfort, Laboratoire de Santé Animale d’Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Cyril Viarouge
- UMR Virologie, INRA, École Nationale Vétérinaire d’Alfort, Laboratoire de Santé Animale d’Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Carrie Batten
- The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom
| | - Giantonella Puggioni
- Istituto Zooprofilattico Sperimentale della Sardegna, Via Duca degli Abruzzi, Sassari, Italy
| | - Ciriaco Ligios
- Istituto Zooprofilattico Sperimentale della Sardegna, Via Duca degli Abruzzi, Sassari, Italy
| | - Giovanni Savini
- Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise (IZSAM), Teramo, Italy
| | - Piet A. van Rijn
- Department of Virology, Wageningen Bioveterinary Research (WBVR), Lelystad, the Netherlands
- Department of Biochemistry, Centre for Human Metabolomics, North-West University, Potchefstroom, South Africa
| | - Peter P. C. Mertens
- The School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, United Kingdom
- The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom
| | - Roman Biek
- Institute of Biodiversity, Animal Health and Comparative Medicine, Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, United Kingdom
| | - Massimo Palmarini
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
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19
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Gethmann J, Probst C, Conraths FJ. Economic Impact of a Bluetongue Serotype 8 Epidemic in Germany. Front Vet Sci 2020; 7:65. [PMID: 32118078 PMCID: PMC7034324 DOI: 10.3389/fvets.2020.00065] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 01/27/2020] [Indexed: 11/13/2022] Open
Abstract
Background and Objectives: Germany was affected by Bluetongue virus serotype 8 (BTV-8) from 2006 to 2009 and recorded new cases since December 2018. We assessed the economic impact of the epidemic from the first cases in 2006 until 2018. Direct costs include production losses, animal deaths, and veterinary treatment. Indirect costs include surveillance, additional measures for animal export, disease control (preventive vaccination and treatment with insecticides), vector monitoring, and administration. Methodology: To estimate the financial impact of BTV-8 on different species and production types at the animal level, we performed a gross margin analysis (GMA) for dairy and beef cattle, and sheep. To estimate the impact on the national level, we used a modified framework described by Rushton et al. (1) and applied a methodology described by Bennett (2). Both the GMA and the economic model on national level were implemented in Excel and the Excel Add-in @Risk. The tools, which are widely applicable, also for other diseases, are made available here. Results: The financial impact of a BTV-8 infection at the animal level was estimated at 119-136 Euros in dairy cattle, at 27 Euros in beef cattle, and at 74 Euros in sheep. At the national level, the impact of the BTV-8 epidemic ranged between 157 and 203 million Euros (mean 180 million Euros). This figure consisted of 132 (73%) and 48 (27%) million Euros for indirect and direct costs. Indirect costs included 89 million Euros (67%) for vaccination, 18 million Euros (14%) for insecticide treatment, 15 million Euros (11%) for diagnostic testing of animals dispatched for trade, 8 million Euros (6%) for monitoring and surveillance, and 3 million Euros (2%) for administration. The highest costs were induced by a compulsory vaccination campaign in 2008 (51 million Euros; 28% of the total costs) and the disease impact on cattle in 2007 (30 million Euros; 17%). Discussion: We compare the outcome of our study with economic analyses of Bluetongue disease in other countries, and discuss the suitability of GMA and the developed tools for a wider application in veterinary economics.
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Affiliation(s)
- Jörn Gethmann
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Epidemiology, Greifswald-Insel Riems, Germany
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20
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Vinomack C, Rivière J, Bréard E, Viarouge C, Postic L, Zientara S, Vitour D, Belbis G, Spony V, Pagneux C, Sailleau C, Zanella G. Clinical cases of Bluetongue serotype 8 in calves in France in the 2018-2019 winter. Transbound Emerg Dis 2020; 67:1401-1405. [PMID: 31883429 DOI: 10.1111/tbed.13466] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 12/20/2019] [Accepted: 12/24/2019] [Indexed: 11/27/2022]
Abstract
Bluetongue virus serotype 8 (BTV-8) caused an epizootic in Europe in 2006/09. Transplacental transmission of BTV-8 was demonstrated leading to abortions, congenital malformations or nervous clinical signs in newborn calves. BTV-8 re-emerged in France in 2015. Although the re-emergent strain is nearly genetically identical to the one that had circulated in 2006/2009, it has caused very few clinical cases. However, from mid-December 2018 to April 2019, cases of calves with congenital malformations or displaying nervous clinical signs occurred in some departments (French administrative unit) in mainland France. Blood samples from these animals were sent to local laboratories, and the positive ones were confirmed at the French Bluetongue reference laboratory (BT-NRL). Out of 580 samples found positive at the local laboratories, 544 were confirmed as RT-PCR BTV-8 positive. The 36 samples found positive in the local laboratories and negative in the BT-NRL were all at the limit of RT-PCR detection. Hundred eighty-eight of the confirmed samples were also tested for the presence of Schmallenberg virus (SBV) and bovine virus diarrhoea virus (BVDV) infection: 4 were found positive for BVDV and none for SBV. The main clinical signs recorded for 244 calves, for which a reporting form was completed by veterinarians, included nervous clinical signs (81%), amaurosis (72%) and decrease/ no suckling reflex (40%). Hydranencephaly and microphthalmia were reported in 19 calves out of 27 in which a necropsy was practiced after death or euthanasia. These results indicate that the re-emergent strain of BTV-8 can cross the transplacental barrier and cause congenital malformations or nervous clinical signs in calves.
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Affiliation(s)
- Chloé Vinomack
- Epidemiology Unit, Laboratory for Animal Health, ANSES, University Paris Est, Maisons-Alfort, France.,USC EPIMAI, Anses, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, France
| | - Julie Rivière
- USC EPIMAI, Anses, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, France
| | - Emmanuel Bréard
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Cyril Viarouge
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Lydie Postic
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Stéphan Zientara
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Damien Vitour
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Guillaume Belbis
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Vincent Spony
- Direction Départementale de la Cohésion Sociale et de la Protection des Populations, Services vétérinaires, Yzeure, France
| | - Caroline Pagneux
- Eurofins Laboratoire Cœur de France, Boulevard de Nomazy, Moulins, France
| | - Corinne Sailleau
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort, France
| | - Gina Zanella
- Epidemiology Unit, Laboratory for Animal Health, ANSES, University Paris Est, Maisons-Alfort, France
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van Rijn PA. Prospects of Next-Generation Vaccines for Bluetongue. Front Vet Sci 2019; 6:407. [PMID: 31824966 PMCID: PMC6881303 DOI: 10.3389/fvets.2019.00407] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 11/01/2019] [Indexed: 01/16/2023] Open
Abstract
Bluetongue (BT) is a haemorrhagic disease of wild and domestic ruminants with a huge economic worldwide impact on livestock. The disease is caused by BT-virus transmitted by Culicoides biting midges and disease control without vaccination is hardly possible. Vaccination is the most feasible and cost-effective way to minimize economic losses. Marketed BT vaccines are successfully used in different parts of the world. Inactivated BT vaccines are efficacious and safe but relatively expensive, whereas live-attenuated vaccines are efficacious and cheap but are unsafe because of under-attenuation, onward spread, reversion to virulence, and reassortment events. Both manufactured BT vaccines do not enable differentiating infected from vaccinated animals (DIVA) and protection is limited to the respective serotype. The ideal BT vaccine is a licensed, affordable, completely safe DIVA vaccine, that induces quick, lifelong, broad protection in all susceptible ruminant species. Promising vaccine candidates show improvement for one or more of these main vaccine standards. BTV protein vaccines and viral vector vaccines have DIVA potential depending on the selected BTV antigens, but are less effective and likely more costly per protected animal than current vaccines. Several vaccine platforms based on replicating BTV are applied for many serotypes by exchange of serotype dominant outer shell proteins. These platforms based on one BTV backbone result in attenuation or abortive virus replication and prevent disease by and spread of vaccine virus as well as reversion to virulence. These replicating BT vaccines induce humoral and T-cell mediated immune responses to all viral proteins except to one, which could enable DIVA tests. Most of these replicating vaccines can be produced similarly as currently marketed BT vaccines. All replicating vaccine platforms developed by reverse genetics are classified as genetic modified organisms. This implies extensive and expensive safety trails in target ruminant species, and acceptance by the community could be hindered. Nonetheless, several experimental BT vaccines show very promising improvements and could compete with marketed vaccines regarding their vaccine profile, but none of these next generation BT vaccines have been licensed yet.
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Affiliation(s)
- Piet A van Rijn
- Department of Virology, Wageningen Bioveterinary Research, Lelystad, Netherlands.,Department of Biochemistry, Centre for Human Metabolomics, North-West University, Potchefstroom, South Africa
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Endalew AD, Faburay B, Wilson WC, Richt JA. Schmallenberg Disease-A Newly Emerged Culicoides-borne Viral Disease of Ruminants. Viruses 2019; 11:v11111065. [PMID: 31731618 PMCID: PMC6893508 DOI: 10.3390/v11111065] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 11/05/2019] [Accepted: 11/09/2019] [Indexed: 12/28/2022] Open
Abstract
First appearing in 2011 in Northern Europe, Schmallenberg virus (SBV), an Orthobunyavirus of the Simbu serogroup, is associated with clinical disease mainly in ruminants such as cattle, sheep and goats. The clinical signs are characterized by abortion and congenital deformities in newborns. The virus is transmitted by Culicoides midges of the Obsoletus complex. SBV infection induces a solid protective immunity that persists for at least 4 or 6 years in sheep and cattle, respectively. SBV infection can be diagnosed directly by real-time RT-qPCR and virus isolation or indirectly by serological assays. Three vaccines are commercially available in Europe. This article provides a comprehensive literature review on this emerging disease regarding pathogenesis, transmission, diagnosis, control and prevention. This review also highlights that although much has been learned since SBV’s first emergence, there are still areas that require further study to devise better mitigation strategies.
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Affiliation(s)
- Abaineh D. Endalew
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (A.D.E.); (B.F.)
| | - Bonto Faburay
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (A.D.E.); (B.F.)
| | - William C. Wilson
- United States Department of Agriculture, Agricultural Research Service, Arthropod-Borne Animal Disease Research Unit, Manhattan, KS 66506, USA
- Correspondence: (W.C.W.); (J.A.R.)
| | - Juergen A. Richt
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (A.D.E.); (B.F.)
- Correspondence: (W.C.W.); (J.A.R.)
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Red deer ( Cervus elaphus) Did Not Play the Role of Maintenance Host for Bluetongue Virus in France: The Burden of Proof by Long-Term Wildlife Monitoring and Culicoides Snapshots. Viruses 2019; 11:v11100903. [PMID: 31569721 PMCID: PMC6832957 DOI: 10.3390/v11100903] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 09/25/2019] [Indexed: 02/07/2023] Open
Abstract
Bluetongue virus (BTV) is a Culicoides-borne pathogen infecting both domestic and wild ruminants. In Europe, the Red Deer (Cervus elaphus) (RD) is considered a potential BTV reservoir, but persistent sylvatic cycle has not yet been demonstrated. In this paper, we explored the dynamics of BTV1 and BTV8 serotypes in the RD in France, and the potential role of that species in the re-emergence of BTV8 in livestock by 2015 (i.e., 5 years after the former last domestic cases). We performed 8 years of longitudinal monitoring (2008–2015) among 15 RD populations and 3065 individuals. We compared Culicoides communities and feeding habits within domestic and wild animal environments (51,380 samples). Culicoides diversity (>30 species) varied between them, but bridge-species able to feed on both wild and domestic hosts were abundant in both situations. Despite the presence of competent vectors in natural environments, BTV1 and BTV8 strains never spread in RD along the green corridors out of the domestic outbreak range. Decreasing antibody trends with no PCR results two years after the last domestic outbreak suggests that seropositive young RD were not recently infected but carried maternal antibodies. We conclude that RD did not play a role in spreading or maintaining BTV in France.
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Hilke J, Strobel H, Woelke S, Stoeter M, Voigt K, Grimm L, Meilwes J, Punsmann T, Blaha I, Salditt A, Rohn K, Bastian M, Ganter M. A comparison of different vaccination schemes used in sheep combining inactivated bluetongue vaccines against serotypes 4 and 8. Vaccine 2019; 37:5844-5853. [PMID: 31431410 DOI: 10.1016/j.vaccine.2019.08.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/14/2019] [Accepted: 08/08/2019] [Indexed: 10/26/2022]
Abstract
Eight different vaccination schemes using four commercially available inactivated Bluetongue vaccines against serotypes 4 and 8 in three different combinations (setting 1-3) were tested under field conditions for their ability to generate a measurable immune response in sheep. Animals of setting 1 (groups A-D) were simultaneously vaccinated using either individual injections at different locations (groups A & D) or double injection by a twin-syringe (groups B & C). For both application methods, a one-shot vaccination (groups C & D) was compared to a boosted vaccination (groups A & B). Sheep of setting 2 (groups E-G) were vaccinated in an alternating, boosted pattern at fortnightly intervals starting with serotype 4 (groups E & F) or vice versa (group G). Group H of setting 3 was vaccinated simultaneously and vaccines were injected individually as a one-shot application. Each group consisted of 30 sheep. The immunogenic response was tested in all sheep (n = 240) by ELISA (IDScreen®Bluetongue Competition), while serum neutralisation tests were performed in five to six sheep from each group (n = 45). All vaccine combinations were well tolerated by all sheep. Of all vaccines and schemes described, the simultaneous double injected boosted vaccination of setting 1 (group B) yielded the highest median serotype-specific titres 26 weeks after the first vaccination (afv) and 100% seropositive animals (ELISA) one year afv. In setting 1, there were no relevant significant differences in the immunogenic response between simultaneously applied vaccines at different sites or at the same injection site. Importantly, a one-shot vaccination induced comparable immunogenicity to a boosted injection half a year afv. Low serotype-specific neutralising antibody levels were detected in settings 2 and 3 and are attributed to diverse factors which may have influenced the measured immunogenicity.
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Affiliation(s)
- Johanna Hilke
- Sheep Veterinary Practice Strobel, Am Hopfenberg 8, 89352 Stoffenried, Germany; Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany.
| | - Heinz Strobel
- Sheep Veterinary Practice Strobel, Am Hopfenberg 8, 89352 Stoffenried, Germany
| | - Soeren Woelke
- Friedrich-Loeffler-Institute, Federal Research Institute for Animal Health, Suedufer 10, 17493 Greifswald - Riems, Germany
| | - Melanie Stoeter
- Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - Katja Voigt
- Clinic for Ruminants with Ambulatory and Herd Health Services, Ludwig-Maximilians-University Munich, Sonnenstr. 16, 85764 Oberschleissheim, Germany
| | - Lucie Grimm
- Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - Johanna Meilwes
- Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - Teresa Punsmann
- Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - Irena Blaha
- State Veterinary Investigation Centre Aulendorf, Loewenbreitestr. 20, 88326 Aulendorf, Germany
| | - Andreas Salditt
- State Veterinary Investigation Centre Aulendorf, Loewenbreitestr. 20, 88326 Aulendorf, Germany
| | - Karl Rohn
- Institute for Biometry, Epidemiology and Information Processing, University of Veterinary Medicine, Hannover, Foundation, Buenteweg 2, 30559 Hannover, Germany
| | - Max Bastian
- Friedrich-Loeffler-Institute, Federal Research Institute for Animal Health, Suedufer 10, 17493 Greifswald - Riems, Germany
| | - Martin Ganter
- Clinic for Swine and Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
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Courtejoie N, Cauchemez S, Zanella G, Durand B. A network-based approach to modelling bluetongue spread in France. Prev Vet Med 2019; 170:104744. [PMID: 31434021 DOI: 10.1016/j.prevetmed.2019.104744] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 07/01/2019] [Accepted: 08/08/2019] [Indexed: 10/26/2022]
Abstract
Bluetongue virus serotype 8 (BTV-8) was reported for the first time in Europe in 2006, causing the largest bluetongue outbreak ever recorded. France was mostly impacted in 2007/09. Trade restrictions were implemented all along. Vaccination became available from 2008: a limited number of doses was first administered in an emergency vaccination campaign, followed by two nationwide compulsory vaccination campaigns in 2009 and 2010. France regained a disease-free status in December 2012, but BTV may have kept circulating undetected as infected herds have been reported again since August 2015. We developed a stochastic dynamic compartmental model of BTV transmission in cattle and sheep to analyze the relative importance of vector active flight and host movements in disease spread, and assess the effectiveness of control measures. We represented BTV transmission both within and between French administrative subdivisions called cantons, during the 2007/09 outbreak and until the end of 2010, when compulsory vaccination was interrupted. Within-canton transmission was vector-borne, and between canton transmission could occur through three contact networks that accounted for movements of: (i) vectors between pastures located at close distance; (ii) cattle and sheep between pastures of the same farm; (iii) traded cattle. We estimated the model parameters by approximate Bayesian computation, using data from the 2007 French outbreak. With this framework, we were able to reproduce the BTV-8 epizootic wave. Host movements between distant pastures of the same farm were found to have a major contribution to BTV spread to disease-free areas, thus raising practical questions about herd management during outbreaks. We found that cattle trade restrictions had been well complied with; without them, the whole French territory would have been infected by winter 2007. The 2008 emergency vaccination campaign had little impact on disease spread as almost half vaccine doses had likely been administered to already immune cattle. Alternatively, establishing a vaccination buffer zone would have allowed a better control of BTV in 2008: limiting its spatial expansion and decreasing the number of infected cattle and sheep. We also showed a major role of compulsory vaccination in controlling the outbreak in 2009 and 2010, though we predicted a possible low-level circulation after the last detection.
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Affiliation(s)
- Noémie Courtejoie
- Epidemiology Unit, Laboratory for Animal Health, French Agency for Food, Environmental and Occupational Health and Safety (ANSES), University Paris-Est, 14 rue Pierre et Marie Curie, 94700 Maisons-Alfort, France; Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, UMR2000, CNRS, 75015 Paris, France.
| | - Simon Cauchemez
- Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, UMR2000, CNRS, 75015 Paris, France.
| | - Gina Zanella
- Epidemiology Unit, Laboratory for Animal Health, French Agency for Food, Environmental and Occupational Health and Safety (ANSES), University Paris-Est, 14 rue Pierre et Marie Curie, 94700 Maisons-Alfort, France.
| | - Benoît Durand
- Epidemiology Unit, Laboratory for Animal Health, French Agency for Food, Environmental and Occupational Health and Safety (ANSES), University Paris-Est, 14 rue Pierre et Marie Curie, 94700 Maisons-Alfort, France.
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Villard P, Muñoz F, Balenghien T, Baldet T, Lancelot R, Hénaux V. Modeling Culicoides abundance in mainland France: implications for surveillance. Parasit Vectors 2019; 12:391. [PMID: 31387649 PMCID: PMC6683357 DOI: 10.1186/s13071-019-3642-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 07/25/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Biting midges of the genus Culicoides Latreille (Diptera: Ceratopogonidae) are involved in the transmission of several viruses affecting humans and livestock, particularly bluetongue (BTV). Over the last decade, Culicoides surveillance has been conducted discontinuously and at various temporal and spatial scales in mainland France following the BTV epizootics in 2008-2009 and its reemergence and continuous circulation since 2015. The ability to predict seasonal dynamics and spatial abundance of Culicoides spp. is a key element in identifying periods and areas at high risk of transmission in order to strengthen surveillance for early detection and to establish seasonally disease-free zones. The objective of this study was to model the abundance of Culicoides spp. using surveillance data. METHODS A mixed-effect Poisson model, adjusted for overdispersion and taking into account temperature data at each trap location, was used to model the weekly relative abundance of Culicoides spp. over a year in 24 vector zones, based on surveillance data collected during 2009-2012. Vector zones are the spatial units used for Culicoides surveillance since 2016 in mainland France. RESULTS The curves of the predicted annual abundance of Culicoides spp. in vector zones showed three different shapes: unimodal, bimodal or plateau, reflecting the temporal variability of the observed counts between zones. For each vector zone, the model enabled to identify periods of vector activity ranging from 25 to 51 weeks. CONCLUSIONS Although the data were collected for surveillance purposes, our modeling approach integrating vector data with daily temperatures, which are known to be major drivers of Culicoides spp. activity, provided areas-specific predictions of Culicoides spp. abundance. Our findings provide decisions makers with essential information to identify risk periods in each vector zone and guide the allocation of resources for surveillance and control. Knowledge of Culicoides spp. dynamics is also of primary importance for modeling the risk of establishment and spread of midge-borne diseases in mainland France.
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Affiliation(s)
- Pierre Villard
- CIRAD, UMR ASTRE, 34398 Montpellier, France
- ASTRE, CIRAD, INRA, Université de Montpellier, Montpellier, France
- Unité Epidémiologie et Appui à la Surveillance, Laboratoire de Lyon, Université de Lyon - ANSES, 31 Avenue Tony Garnier, 69007 Lyon, France
| | - Facundo Muñoz
- CIRAD, UMR ASTRE, 34398 Montpellier, France
- ASTRE, CIRAD, INRA, Université de Montpellier, Montpellier, France
| | - Thomas Balenghien
- ASTRE, CIRAD, INRA, Université de Montpellier, Montpellier, France
- Unité Microbiologie, Immunologie et Maladies Contagieuses, Institut Agronomique et Vétérinaire Hassan II, 10100 Rabat, Morocco
- CIRAD, UMR ASTRE, 10101 Rabat, Morocco
| | - Thierry Baldet
- CIRAD, UMR ASTRE, 34398 Montpellier, France
- ASTRE, CIRAD, INRA, Université de Montpellier, Montpellier, France
| | - Renaud Lancelot
- CIRAD, UMR ASTRE, 34398 Montpellier, France
- ASTRE, CIRAD, INRA, Université de Montpellier, Montpellier, France
| | - Viviane Hénaux
- Unité Epidémiologie et Appui à la Surveillance, Laboratoire de Lyon, Université de Lyon - ANSES, 31 Avenue Tony Garnier, 69007 Lyon, France
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Bluetongue Virus in France: An Illustration of the European and Mediterranean Context since the 2000s. Viruses 2019; 11:v11070672. [PMID: 31340459 PMCID: PMC6669443 DOI: 10.3390/v11070672] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 07/05/2019] [Accepted: 07/19/2019] [Indexed: 01/24/2023] Open
Abstract
Bluetongue (BT) is a non-contagious animal disease transmitted by midges of the Culicoides genus. The etiological agent is the BT virus (BTV) that induces a variety of clinical signs in wild or domestic ruminants. BT is included in the notifiable diseases list of the World Organization for Animal Health (OIE) due to its health impact on domestic ruminants. A total of 27 BTV serotypes have been described and additional serotypes have recently been identified. Since the 2000s, the distribution of BTV has changed in Europe and in the Mediterranean Basin, with continuous BTV incursions involving various BTV serotypes and strains. These BTV strains, depending on their origin, have emerged and spread through various routes in the Mediterranean Basin and/or in Europe. Consequently, control measures have been put in place in France to eradicate the virus or circumscribe its spread. These measures mainly consist of assessing virus movements and the vaccination of domestic ruminants. Many vaccination campaigns were first carried out in Europe using attenuated vaccines and, in a second period, using exclusively inactivated vaccines. This review focuses on the history of the various BTV strain incursions in France since the 2000s, describing strain characteristics, their origins, and the different routes of spread in Europe and/or in the Mediterranean Basin. The control measures implemented to address this disease are also discussed. Finally, we explain the circumstances leading to the change in the BTV status of France from BTV-free in 2000 to an enzootic status since 2018.
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Presence of Antibodies against Bluetongue Virus (BTV) in Sheep 5 to 7.5 Years after Vaccination with Inactivated BTV-8 Vaccines. Viruses 2019; 11:v11060533. [PMID: 31181733 PMCID: PMC6630684 DOI: 10.3390/v11060533] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 05/31/2019] [Accepted: 06/06/2019] [Indexed: 11/17/2022] Open
Abstract
Thirty-six female sheep, previously vaccinated against Bluetongue virus serotype 8 (BTV-8) using inactivated vaccines, were included in this field study. In Germany, vaccination was compulsory in 2008 and 2009, voluntary in 2010 and early 2011, and later, was prohibited in 2011. Due to their age, eighteen sheep had been vaccinated for two or more consecutive years, while a further eighteen animals had only been vaccinated once or not at all. The sheep were blood sampled five (n = 31) to 7.5 years (n = 5) after their last vaccination. All serum samples (n = 36) were tested for BTV group-specific antibodies by an ELISA (IDScreen® Bluetongue Competition assay, ID Vet). In five of the animals, the BTV-8 serotype-specific antibody titers were measured by serum neutralization (SN). The majority of sheep that were vaccinated annually for two or more years showed a positive ELISA (14/18 sheep) and a SN (two of two sheep) result 5 years after their last vaccination. Most of the sheep vaccinated fewer than twice showed a negative ELISA result 5 to 7.5 years after their last vaccination (13/18 animals). The three animals in this group tested by SN showed one negative and two positive results. This short communication is the first to describe the presence of BTV antibodies in sheep 5 to 7.5 years after vaccination with inactivated BTV-8 vaccines.
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Flannery J, Sanz-Bernardo B, Ashby M, Brown H, Carpenter S, Cooke L, Corla A, Frost L, Gubbins S, Hicks H, Qureshi M, Rajko-Nenow P, Sanders C, Tully M, Bréard E, Sailleau C, Zientara S, Darpel K, Batten C. Evidence of reduced viremia, pathogenicity and vector competence in a re-emerging European strain of bluetongue virus serotype 8 in sheep. Transbound Emerg Dis 2019; 66:1177-1185. [PMID: 30661301 PMCID: PMC6563110 DOI: 10.1111/tbed.13131] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 10/01/2018] [Accepted: 01/13/2019] [Indexed: 12/02/2022]
Abstract
The outbreak of bluetongue virus (BTV) serotype 8 (BTV-8) during 2006-2009 in Europe was the most costly epidemic of the virus in recorded history. In 2015, a BTV-8 strain re-emerged in France which has continued to circulate since then. To examine anecdotal reports of reduced pathogenicity and transmission efficiency, we investigated the infection kinetics of a 2007 UK BTV-8 strain alongside the re-emerging BTV-8 strain isolated from France in 2017. Two groups of eight BTV-naïve British mule sheep were inoculated with 5.75 log10 TCID50 /ml of either BTV-8 strain. BTV RNA was detected by 2 dpi in both groups with peak viraemia occurring between 5-9 dpi. A significantly greater amount of BTV RNA was detected in sheep infected with the 2007 strain (6.0-8.8 log10 genome copies/ml) than the re-emerging BTV-8 strain (2.9-7.9 log10 genome copies/ml). All infected sheep developed BTV-specific antibodies by 9 dpi. BTV was isolated from 2 dpi to 12 dpi for 2007 BTV-8-inoculated sheep and from 5 to 10 dpi for sheep inoculated with the remerging BTV-8. In Culicoides sonorensis feeding on the sheep over the period 7-12 dpi, vector competence was significantly higher for the 2007 strain than the re-emerging strain. Both the proportion of animals showing moderate (as opposed to mild or no) clinical disease (6/8 vs. 1/8) and the overall clinical scores (median 5.25 vs. 3) were significantly higher in sheep infected with the 2007 strain, compared to those infected with the re-emerging strain. However, one sheep infected with the re-emerging strain was euthanized at 16 dpi having developed severe lameness. This highlights the potential of the re-emerging BTV-8 to still cause illness in naïve ruminants with concurrent costs to the livestock industry.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Emmanuel Bréard
- Université Paris-Est ANSES Alfort, UMR 1161 ANSES/INRA/ENVA,, Maisons-Alfort, France
| | - Corinne Sailleau
- Université Paris-Est ANSES Alfort, UMR 1161 ANSES/INRA/ENVA,, Maisons-Alfort, France
| | - Stephan Zientara
- Université Paris-Est ANSES Alfort, UMR 1161 ANSES/INRA/ENVA,, Maisons-Alfort, France
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Yildirim A, Dik B, Duzlu O, Onder Z, Ciloglu A, Yetismis G, Inci A. Genetic diversity of Culicoides species within the Pulicaris complex (Diptera: Ceratopogonidae) in Turkey inferred from mitochondrial COI gene sequences. Acta Trop 2019; 190:380-388. [PMID: 30553894 DOI: 10.1016/j.actatropica.2018.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 12/04/2018] [Accepted: 12/04/2018] [Indexed: 12/27/2022]
Abstract
Identification of Culicoides (Diptera: Ceratopogonidae) biting midges to species has become important due to their potential role in the transmission of arboviruses such as bluetongue virus, bovine ephemeral fever virus, Akabane virus, African horse sickness virus, epizootic haemorrhagic disease virus and Schmallenberg virus. In several studies, molecular tools, used for the identification of biting midges, revealed the presence of cryptic and undescribed species especially within Pulicaris complex. The presence of cryptic species within species complexes raise questions about their role in viral disease transmission as there are apparent differences in the vectorial capacity between closely related species. In this study, we analyzed the mitochondrial DNA cytochrome oxidase I (COI) gene sequences of species within the Pulicaris complex present in Turkey and determined their phylogenetic relationships. Twenty-one haplotypes within the already described species C. pulicaris P1, C. lupicaris, C. lupicaris L2, C. newsteadi, C. newsteadi N1, C. punctatus, C. fagineus F2 and C. flavipulicaris were determined from the study areas. The molecular analysis revealed further two haplotypes belonging to new non-described cryptic species named as C. lupicaris L3 and Culicoides WBS corresponding to C. lupicaris and Fagineus complex which diverged by 17.9% to 25.7% and 18.7% to 31.8%, respectively from other species in the subgenus Culicoides. Genetic divergence within species was <2.0% and phylogenetic analyses of the COI dataset revealed 22 different monophyletic separate clades within two major cluster. The results of this study emphasize the applicability of COI sequences as a diagnostic marker for differentiating Culicoides species and revealing cryptic species.
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Maclachlan NJ, Zientara S, Wilson WC, Richt JA, Savini G. Bluetongue and epizootic hemorrhagic disease viruses: recent developments with these globally re-emerging arboviral infections of ruminants. Curr Opin Virol 2019; 34:56-62. [PMID: 30654271 DOI: 10.1016/j.coviro.2018.12.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 12/11/2018] [Indexed: 11/19/2022]
Abstract
Bluetongue (BT) and epizootic hemorrhagic disease (EHD) are globally re-emerging diseases of domestic and wild ruminants, respectively caused by BT virus (BTV) and EHD virus. Both viruses are transmitted by hematophagous midges; however, newly recognized BTV serotypes may be transmitted horizontally without requirement for any biological vector. The global range of these viruses and/or their associated diseases have changed remarkably in recent years, most notably with the invasion of Europe by multiple serotypes of BTV since 1998. Although not zoonoses, the unanticipated emergence of BT and EHD in several different areas of the world provides a uniquely sobering and unambiguous reminder of the potential consequences of climate change on the distribution and severity of vector-borne diseases. Recent experiences with these viruses have also emphasized the need for effective, DIVA-compatible vaccines to combat anticipated future incursions, as existing vaccines have serious inherent deficiencies.
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Affiliation(s)
- Nigel James Maclachlan
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.
| | - Stephan Zientara
- UMR VIROLOGIE, INRA, Ecole Nationale Vétérinaire d'Alfort, ANSES, Université Paris-Est, Maisons-Alfort 94700, France
| | - William C Wilson
- Arthropod-Borne Animal Diseases Research Unit, Agricultural Research Service, USDA, Manhattan, KS, USA
| | - Juergen A Richt
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, USA
| | - Giovanni Savini
- Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise, OIE Reference Laboratory for BTV, Teramo, Italy
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Sohail T, Yaqub T, Abbas T, Rabbani M, Nazir J, Maqbool SM, Yaqub S, Habib M, Ul-Rahman A, Mukhtar N, Shahbaz M, Zahoor MY, Shabbir MZ. Seroprevalence of Bluetongue virus in small and large ruminants in Punjab province, Pakistan. Acta Trop 2019; 189:22-29. [PMID: 30261187 DOI: 10.1016/j.actatropica.2018.09.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 09/22/2018] [Accepted: 09/22/2018] [Indexed: 11/15/2022]
Abstract
Bluetongue (BT) is a vector-borne disease of immense economic importance for small and large ruminants. Despite frequent disease reports from neighboring countries, a little is known about current disease status and prevalent serotypes in Pakistan. We screened a total of 1312 healthy animals for group-specific antibodies and serotype-specific genome for BT virus through competitive ELISA and real-time PCR, respectively. An overall prevalence of group-specific VP7 antibodies [28.81% (n = 378/1312, 95% CI = 26.4-31.4)] was observed. The prevalence was higher in goats [40.75% (n = 194/476, 95% CI = 36.4-45.3)] followed by buffalo [29.34% (n = 81/276, 95% CI = 24.3-34.9)], sheep [18.40% (n = 60/326, 95% CI = 14.5-22.9)] and cattle [17.94% (n = 42/234, 95% CI = 13.56-23.4)]. The odds of seropositivity were more in buffalo of Nili breed (OR = 2.06, 95% CI = 1.19-3.58) as well as those found with a presence of vector (OR = 2.04, 95% CI = 1.16-3.59). Buffalo and cattle with history of abortion [(OR = 3.95, 95% CI = 1.33-11.69) and (OR = 5.89, 95% CI = 1.80-19.27) respectively] were much likely to be infected with the disease. Serotype 8 was detected in all animal species while, serotypes 4 and 6 were detected in sheep, 2, 6 and 11 in goat, and 2 and 16 in buffalo. The study concludes a much frequent exposure of different serotypes of Bluetongue virus (BTV) in small and large ruminants and indicates its expansion to enzootic range worldwide.
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Affiliation(s)
- Tayyebah Sohail
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | - Tahir Yaqub
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | - Tariq Abbas
- Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Masood Rabbani
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | - Jawad Nazir
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | | | - Saima Yaqub
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | - Momena Habib
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | - Aziz Ul-Rahman
- University of Veterinary and Animal Sciences, Lahore 54600, Pakistan
| | - Nadia Mukhtar
- Primary and Secondary Healthcare Department, Government of Punjab, Pakistan
| | - Muhammad Shahbaz
- Women University of Azad Jammu and Kashmir, Bagh 12600, Pakistan
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Collins ÁB, Mee JF, Doherty ML, Barrett DJ, England ME. Culicoides species composition and abundance on Irish cattle farms: implications for arboviral disease transmission. Parasit Vectors 2018; 11:472. [PMID: 30119685 PMCID: PMC6098625 DOI: 10.1186/s13071-018-3010-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 07/11/2018] [Indexed: 11/10/2022] Open
Abstract
Background Following the emergence of Schmallenberg virus (SBV) in Ireland in 2012, a sentinel herd surveillance program was established in the south of Ireland with the primary aim of investigating the species composition and abundance of Culicoides on livestock farms in the region. Methods Ultraviolet-light trapping for Culicoides was carried out on 10 sentinel farms. Each site was sampled fortnightly over 16 weeks (21st July to 5th November 2014). One Onderstepoort Veterinary Institute UV light trap was run overnight at each site and catches were transferred immediately into 70% ethanol. Culicoides were morphologically identified to species level. Collection site habitats were characterised using the Phase 1 habitat survey technique (Joint Nature Conservation Committee). Results A total of 23,929 individual Culicoides from 20 species was identified, including one species identified in Ireland for the first time, Culicoides cameroni. The most abundant species identified were Culicoides obsoletus/Culicoides scoticus (38%), Culicoides dewulfi (36%), Culicoides pulicaris (9%), Culicoides chiopterus (5%) and Culicoides punctatus (5%), comprising 93% of all Culicoides specimens identified. Collection site habitats were dominated by improved grassland and a combination of broadleaf woodland and native woodland species. Conclusions The most abundant species of Culicoides identified were the putative vectors of bluetongue virus (BTV) and SBV in northern Europe. Their presence and abundance demonstrates the potential for future transmission of arboviruses among livestock in this region. Electronic supplementary material The online version of this article (10.1186/s13071-018-3010-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Áine B Collins
- Animal and Bioscience Research Department, Teagasc, Moorepark, Fermoy, Co. Cork, Ireland. .,School of Veterinary Medicine, University College Dublin, Dublin 4, Ireland.
| | - John F Mee
- Animal and Bioscience Research Department, Teagasc, Moorepark, Fermoy, Co. Cork, Ireland
| | - Michael L Doherty
- School of Veterinary Medicine, University College Dublin, Dublin 4, Ireland
| | - Damien J Barrett
- Surveillance, Animal By Products and TSE Division, Department of Agriculture, Food and the Marine, Backweston, Celbridge, Co. Kildare, Ireland
| | - Marion E England
- The Pirbright Institute, Ash Rd., Pirbright, Woking, Surrey, GU24 0NF, UK
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Paslaru AI, Mathis A, Torgerson P, Veronesi E. Vector competence of pre-alpine Culicoides (Diptera: Ceratopogonidae) for bluetongue virus serotypes 1, 4 and 8. Parasit Vectors 2018; 11:466. [PMID: 30103803 PMCID: PMC6090685 DOI: 10.1186/s13071-018-3050-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 08/03/2018] [Indexed: 12/02/2022] Open
Abstract
Background Bluetongue disease, caused by bluetongue virus serotype 8 (BTV-8), appeared for the first time in the northern part of Europe in 2006, and subsequently rapidly spread causing severe economic losses to the farming industry. The implicated vectors of BTV in Europe are Culicoides species within the subgenus Avaritia (C. chiopterus, C. dewulfi, C. obsoletus and C. scoticus). Epidemiological data from Switzerland have shown that BTV, whose spread was eliminated at an early stage by vaccination campaigns, had not been circulating among livestock at higher altitudes where other species dominate the Culicoides fauna. In this study, we investigated the extent that Culicoides spp. prevailing at higher altitudes (mainly C. grisescens) can act as vectors for BTV. Methods Culicoides were collected at farms in the pre-alpine region (two sites at 1550 m above sea level, masl, referred to as pre-alpine I; one site at 2030 masl, pre-alpine II) and, for comparative purposes, from the Swiss Plateau (one site, 650 masl). They were fed on bovine blood/BTV suspensions (BTV-1, 4 or 8) and incubated for eight days under a fluctuating temperature regime (13–25 °C, mean 19 °C), reflecting a mid-summer warm spell in the pre-alpine region. Susceptibility to BTV transmission was assessed from head homogenates by RT-qPCR and virus isolation. Results Overall, 9196 female Culicoides were exposed to the three BTV strains through an artificial membrane, with feeding rates of 14–27%. Survival rates of blood-engorged Culicoides females at eight days post-infection depended on both virus serotype and altitude of origin. Virus dissemination (Cq ≤ the cut-off value as determined by serial virus dilutions) was confirmed only for BTV-1 in C. scoticus (dissemination efficiency 22.5%; 9/40) and C. obsoletus (5.6%; 1/18) from the Swiss Plateau area. There was no strong evidence of susceptibility to infection for Culicoides from the pre-alpine area when fed with all BTV strains (BTV-1, 4 and 8). Conclusions This study confirms the susceptibility of C. scoticus and C. obsoletus to BTV-1 infection, including under cooler temperatures. Culicoides grisescens, which is highly abundant at higher altitudes, cannot be considered a potential vector under these temperature conditions. Electronic supplementary material The online version of this article (10.1186/s13071-018-3050-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Anca Ioana Paslaru
- National Centre for Vector Entomology, Institute of Parasitology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Alexander Mathis
- National Centre for Vector Entomology, Institute of Parasitology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Paul Torgerson
- Section of Epidemiology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Eva Veronesi
- National Centre for Vector Entomology, Institute of Parasitology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
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Sailleau C, Breard E, Viarouge C, Gorlier A, Leroux A, Hirchaud E, Lucas P, Blanchard Y, Vitour D, Grandcollot-Chabot M, Zientara S. Emergence of bluetongue virus serotype 4 in mainland France in November 2017. Transbound Emerg Dis 2018; 65:1158-1162. [PMID: 29885075 DOI: 10.1111/tbed.12919] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 05/04/2018] [Accepted: 05/07/2018] [Indexed: 11/26/2022]
Abstract
In November 2017, a 15-day-old calf located in France (Haute-Savoie department) was found positive for bluetongue virus (BTV) RNA by RT-PCR. Laboratory investigations allowed the isolation and identification of the serotype: BTV-4. The analysis of the full viral genome showed that all the 10 genome segments were closely related to BTV-4 strains involved in a large BT outbreak in the Balkan Peninsula, in Italy since 2014 and in Corsica since the end of October 2016. These results together with epidemiological data suggest that BTV-4 has been introduced to mainland France from Corsica or Italy where BTV-4 outbreaks have been reported in summer and autumn 2016. This is the first report of the introduction of BTV-4 in mainland France.
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Affiliation(s)
- Corinne Sailleau
- UMR 1161 ANSES/INRA/ENVA, Université Paris-Est ANSES Maisons-Alfort, Maisons-Alfort, France
| | - Emmanuel Breard
- UMR 1161 ANSES/INRA/ENVA, Université Paris-Est ANSES Maisons-Alfort, Maisons-Alfort, France
| | - Cyril Viarouge
- UMR 1161 ANSES/INRA/ENVA, Université Paris-Est ANSES Maisons-Alfort, Maisons-Alfort, France
| | - Axel Gorlier
- UMR 1161 ANSES/INRA/ENVA, Université Paris-Est ANSES Maisons-Alfort, Maisons-Alfort, France
| | - Aurélie Leroux
- Unit of Viral Genetics and Biosafety, ANSES, Laboratory of Ploufragan, Ploufragan, France
| | - Edouard Hirchaud
- Unit of Viral Genetics and Biosafety, ANSES, Laboratory of Ploufragan, Ploufragan, France
| | - Pierrick Lucas
- Unit of Viral Genetics and Biosafety, ANSES, Laboratory of Ploufragan, Ploufragan, France
| | - Yannick Blanchard
- Unit of Viral Genetics and Biosafety, ANSES, Laboratory of Ploufragan, Ploufragan, France
| | - Damien Vitour
- UMR 1161 ANSES/INRA/ENVA, Université Paris-Est ANSES Maisons-Alfort, Maisons-Alfort, France
| | - Marie Grandcollot-Chabot
- Ministry of Agriculture, General Directorate for Food Safety, Animal Health Office, Paris, France
| | - Stephan Zientara
- UMR 1161 ANSES/INRA/ENVA, Université Paris-Est ANSES Maisons-Alfort, Maisons-Alfort, France
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36
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Courtejoie N, Salje H, Durand B, Zanella G, Cauchemez S. Using serological studies to reconstruct the history of bluetongue epidemic in French cattle under successive vaccination campaigns. Epidemics 2018; 25:54-60. [PMID: 29807734 DOI: 10.1016/j.epidem.2018.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 05/14/2018] [Accepted: 05/16/2018] [Indexed: 10/16/2022] Open
Abstract
Bluetongue virus is a vector-borne pathogen affecting ruminants that has caused major epidemics in France. Reconstructing the history of bluetongue in French cattle under control strategies such as vaccination has been hampered by the high level of sub-clinical infection, incomplete case data and poor understanding of vaccine uptake over time and space. To tackle these challenges, we used three age-structured serological surveys carried out in cattle (N = 22,342) from ten administrative subdivisions called departments. We fitted catalytic models within a Bayesian MCMC framework to reconstruct the force of seroconversion from infection or vaccination, and the population-level susceptibility per semester between 2007 and 2016. In the departments of the study area, we estimated that 36% of cattle had been infected prior to vaccine rollout that became compulsory from July 2008. The last outbreak case was notified in December 2009, at which time 83% of the animals were seropositive, under the cumulative effect of vaccination and infection. The probability of seroconversion per semester dropped below 10% after 2010 when vaccination became optional. Vaccine uptake was smaller during the 2012 campaign than during the one in 2011, with strong regional contrasts. Eighty four percent of cattle were susceptible when bluetongue re-emerged in 2015. Thus, serological surveys can be used to estimate vaccine uptake and the magnitude of infection, the relative effect of which can sometimes be inferred using prior knowledge on reported incidence and vaccination dates.
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Affiliation(s)
- Noémie Courtejoie
- Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Paris, 75015, France; CNRS UMR2000: Génomique évolutive, modélisation et santé (GEMS), Institut Pasteur, Paris, France; Center of Bioinformatics, Biostatistics and Integrative Biology, Institut Pasteur, Paris, 75015, France; Epidemiology Unit, Laboratory for Animal Health, ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Paris-Est University, Maisons-Alfort 94700, France
| | - Henrik Salje
- Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Paris, 75015, France; CNRS UMR2000: Génomique évolutive, modélisation et santé (GEMS), Institut Pasteur, Paris, France; Center of Bioinformatics, Biostatistics and Integrative Biology, Institut Pasteur, Paris, 75015, France
| | - Benoît Durand
- Epidemiology Unit, Laboratory for Animal Health, ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Paris-Est University, Maisons-Alfort 94700, France.
| | - Gina Zanella
- Epidemiology Unit, Laboratory for Animal Health, ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Paris-Est University, Maisons-Alfort 94700, France
| | - Simon Cauchemez
- Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Paris, 75015, France; CNRS UMR2000: Génomique évolutive, modélisation et santé (GEMS), Institut Pasteur, Paris, France; Center of Bioinformatics, Biostatistics and Integrative Biology, Institut Pasteur, Paris, 75015, France
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37
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Sohail T, Yaqub T, Shafee M, Abbas T, Nazir J, Ullah N, Rabbani M, Chaudhary MH, Mukhtar N, Habib M, Ul Rahman A, Malik AI, Ghafoor A, Zahoor MY, Shabbir MZ. Seroprevalence of Bluetongue Virus in small ruminants in Balochistan province, Pakistan. Transbound Emerg Dis 2018; 65:1272-1281. [DOI: 10.1111/tbed.12871] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Indexed: 12/01/2022]
Affiliation(s)
- T. Sohail
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - T. Yaqub
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - M. Shafee
- University of Balochistan; Quetta Pakistan
| | - T. Abbas
- Islamia University of Bahawalpur; Bahawalpur Pakistan
| | - J. Nazir
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - N. Ullah
- University of Balochistan; Quetta Pakistan
| | - M. Rabbani
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | | | - N. Mukhtar
- Institute of Public Health; Lahore Pakistan
| | - M. Habib
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - A. Ul Rahman
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - A. I. Malik
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - A. Ghafoor
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - M. Y. Zahoor
- University of Veterinary and Animal Sciences; Lahore Pakistan
| | - M. Z. Shabbir
- University of Veterinary and Animal Sciences; Lahore Pakistan
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Stojmanovski Z, Tabakovski B. Spatio-Temporal Characteristics of the Bluetongue Epizooty in the Balkan Peninsula from 2014 to February 2015. MACEDONIAN VETERINARY REVIEW 2018. [DOI: 10.1515/macvetrev-2017-0033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Starting in May 2014 an emerging Bluetongue (BT) serotype 4 (BTV-4) epizooty has affected the ruminant population of eleven countries from the Balkan Peninsula. Consequently, the veterinary services implemented various bio-security measures and a considerable discussion has been raised if future BTV surveillance and preventive measures should be taken in risk based zones and periods. Therefore, the objective of this work was to describe the spatial and temporal characteristics of the BTV-4 epizooty in the Balkan Peninsula from May 2014 to February 2015. We used the space-time permutation model of the scan statistic to identify the space-time disease clusters. The scan statistic was parameterized to a maximum temporal length of 150 days (duration of the epizooty in the Balkans in 2014) and a radius of 100 km as a maximum spatial cluster size (protection zone for BT). Results were significant (p < 0.05) to the maximum spatial size defined for the clusters. From the 6295 BT outbreaks the scan statistics identified 33 disease clusters in nine Balkan countries. The highest number of outbreaks occurred from September to November 2014.The earliest cluster was detected in Greece in July 2014 with a radius of 56 km. The latest cluster was detected in Croatia in February 2015 with a radius of 99,8 km. These results are a first description of the spatial and temporal characteristics of the 2014-February 2015 BT epizooty in the Balkans.
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Affiliation(s)
- Zharko Stojmanovski
- Food and Veterinary Agency, Inspection Department , 11 Oktomvri str. bb, Branch Office, 1300 Kumanovo , Republic of Macedonia
| | - Blagojcho Tabakovski
- Food and Veterinary Agency, Animal Health and Welfare Department , 3-ta Makedonska Brigada 20, 1000 Skopje , Republic of Macedonia
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Bréard E, Schulz C, Sailleau C, Bernelin-Cottet C, Viarouge C, Vitour D, Guillaume B, Caignard G, Gorlier A, Attoui H, Gallois M, Hoffmann B, Zientara S, Beer M. Bluetongue virus serotype 27: Experimental infection of goats, sheep and cattle with three BTV-27 variants reveal atypical characteristics and likely direct contact transmission BTV-27 between goats. Transbound Emerg Dis 2017; 65:e251-e263. [PMID: 29243405 DOI: 10.1111/tbed.12780] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Indexed: 11/30/2022]
Abstract
Bluetongue virus (BTV) hitherto consisted of 26 recognized serotypes, of which all except BTV-26 are primarily transmitted by certain species of Culicoides biting midges. Three variants of an additional 27th bluetongue virus serotype (BTV-27v01-v03) were recently detected in asymptomatic goats in Corsica, France, 2014-2015. Molecular characterization revealed genetic differences between the three variants. Therefore, in vivo characteristics were investigated by experimental infection of a total of 15 goats, 11 sheep and 4 cattle with any one of the three variants in separated animal trials. In goat trials, BTV-naïve animals of the same species were kept in a facility where direct contact was unhindered. Of the 15 inoculated goats, 13 and 14 animals were found positive for BTV-RNA and antibodies (Ab), respectively, until the end of the experiments. Surprisingly, BTV-Ab levels as measured with ELISA and neutralization test (SNT) were remarkably low in all seropositive goats. Virus isolation from whole-blood was possible at the peak of viremia until 49 dpi. Moreover, detection of BTV-27v02-RNA and Ab in one contact goat indicated that-similar to BTV-26-at least one of three BTV-27 variants may be transmitted by contact between goats. In the field, BTV-27 RNA can be detected up to 6 months in the whole-blood of BTV-27-infected Corsican goats. In contrast, BTV RNA was not detected in the blood of cattle or sheep. In addition, BTV-27 Abs were not detected in cattle and only a transient increase in Ab levels was observed in some sheep. None of the 30 animals showed obvious BT-like clinical signs. In summary, the phenotypes observed for BTV-27v01-v03 phenotypes correspond to a mixture of characteristics known for BTV-25 and 26.
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Affiliation(s)
- E Bréard
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - C Schulz
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - C Sailleau
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - C Bernelin-Cottet
- Virologie et Immunologie Moléculaires, UR892 INRA, Domaine de Vilvert, Jouy-en-Josas, France
| | - C Viarouge
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - D Vitour
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - B Guillaume
- Ecole Nationale Veterinaire d'Alfort, Unite de Pathologie du Betail, Universite Paris-Est, Maisons-Alfort, France
| | - G Caignard
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - A Gorlier
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - H Attoui
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - M Gallois
- Regional Federation of Corsican Animal Health Groups, FRGDSB20, Ajaccio, France
| | - B Hoffmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - S Zientara
- Laboratoire de Santé Animale d'Alfort, Université Paris Est, ANSES, ENVA, INRA, UMR 1161 VIROLOGIE, Maisons-Alfort, France
| | - M Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
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40
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Brand SPC, Keeling MJ. The impact of temperature changes on vector-borne disease transmission: Culicoides midges and bluetongue virus. J R Soc Interface 2017; 14:rsif.2016.0481. [PMID: 28298609 DOI: 10.1098/rsif.2016.0481] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 02/20/2017] [Indexed: 11/12/2022] Open
Abstract
It is a long recognized fact that climatic variations, especially temperature, affect the life history of biting insects. This is particularly important when considering vector-borne diseases, especially in temperate regions where climatic fluctuations are large. In general, it has been found that most biological processes occur at a faster rate at higher temperatures, although not all processes change in the same manner. This differential response to temperature, often considered as a trade-off between onward transmission and vector life expectancy, leads to the total transmission potential of an infected vector being maximized at intermediate temperatures. Here we go beyond the concept of a static optimal temperature, and mathematically model how realistic temperature variation impacts transmission dynamics. We use bluetongue virus (BTV), under UK temperatures and transmitted by Culicoides midges, as a well-studied example where temperature fluctuations play a major role. We first consider an optimal temperature profile that maximizes transmission, and show that this is characterized by a warm day to maximize biting followed by cooler weather to maximize vector life expectancy. This understanding can then be related to recorded representative temperature patterns for England, the UK region which has experienced BTV cases, allowing us to infer historical transmissibility of BTV, as well as using forecasts of climate change to predict future transmissibility. Our results show that when BTV first invaded northern Europe in 2006 the cumulative transmission intensity was higher than any point in the last 50 years, although with climate change such high risks are the expected norm by 2050. Such predictions would indicate that regular BTV epizootics should be expected in the UK in the future.
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Affiliation(s)
- Samuel P C Brand
- Zeeman Institute: SBIDER, University of Warwick, Coventry CV4 7AL, UK .,School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Matt J Keeling
- Zeeman Institute: SBIDER, University of Warwick, Coventry CV4 7AL, UK.,School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK.,Mathematics Institute, University of Warwick, Coventry CV4 7AL, UK
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41
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Jacquot M, Nomikou K, Palmarini M, Mertens P, Biek R. Bluetongue virus spread in Europe is a consequence of climatic, landscape and vertebrate host factors as revealed by phylogeographic inference. Proc Biol Sci 2017; 284:20170919. [PMID: 29021180 PMCID: PMC5647287 DOI: 10.1098/rspb.2017.0919] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 09/08/2017] [Indexed: 01/13/2023] Open
Abstract
Spatio-temporal patterns of the spread of infectious diseases are commonly driven by environmental and ecological factors. This is particularly true for vector-borne diseases because vector populations can be strongly affected by host distribution as well as by climatic and landscape variables. Here, we aim to identify environmental drivers for bluetongue virus (BTV), the causative agent of a major vector-borne disease of ruminants that has emerged multiple times in Europe in recent decades. In order to determine the importance of climatic, landscape and host-related factors affecting BTV diffusion across Europe, we fitted different phylogeographic models to a dataset of 113 time-stamped and geo-referenced BTV genomes, representing multiple strains and serotypes. Diffusion models using continuous space revealed that terrestrial habitat below 300 m altitude, wind direction and higher livestock densities were associated with faster BTV movement. Results of discrete phylogeographic analysis involving generalized linear models broadly supported these findings, but varied considerably with the level of spatial partitioning. Contrary to common perception, we found no evidence for average temperature having a positive effect on BTV diffusion, though both methodological and biological reasons could be responsible for this result. Our study provides important insights into the drivers of BTV transmission at the landscape scale that could inform predictive models of viral spread and have implications for designing control strategies.
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Affiliation(s)
- Maude Jacquot
- College of Medical, Veterinary and Life Sciences, Institute of Biodiversity, Animal Health and Comparative Medicine, Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, UK
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
| | - Kyriaki Nomikou
- The Pirbright Institute, Pirbright, Woking, UK
- The School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, UK
| | | | - Peter Mertens
- The Pirbright Institute, Pirbright, Woking, UK
- The School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington, Leicestershire, UK
| | - Roman Biek
- College of Medical, Veterinary and Life Sciences, Institute of Biodiversity, Animal Health and Comparative Medicine, Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow, UK
- MRC-University of Glasgow Centre for Virus Research, Glasgow, UK
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Courtejoie N, Durand B, Bréard E, Sailleau C, Vitour D, Zientara S, Gorlier A, Baurier F, Gourmelen C, Benoit F, Achour H, Milard C, Poliak S, Pagneux C, Viarouge C, Zanella G. Serological status for BTV-8 in French cattle prior to the 2015 re-emergence. Transbound Emerg Dis 2017; 65:e173-e182. [PMID: 28940827 DOI: 10.1111/tbed.12718] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Indexed: 11/27/2022]
Abstract
Undetected in Europe since 2010, bluetongue virus serotype 8 (BTV-8) re-emerged in August 2015 in Central France. To gain insight into the re-emergence on the French territory, we estimated the seroprevalence in cattle before the detection of BTV-8 in 2015, in areas differentially affected by the current outbreak. A retrospective survey based on the analysis of stored sera was thus conducted in the winter preceding the re-emergence in seven French departments including the one where the virus was first detected. A total of 10,066 sera were retrieved from animals sampled in 444 different herds in winter 2014/15. Between-herd seroprevalence revealed the presence of seropositive animals in almost all herds sampled (97.4%). The animal-level seroprevalence averaged at 44%, with a strong age pattern reflecting the cumulative exposure to both natural infection and to vaccination. A multivariable analysis allowed separating the respective effects of both exposures. A higher proportion of seropositivity risk was attributed to vaccination (67.4%) than to exposure to natural infection (24.2%). The evolution of seroprevalence induced by the two main risk factors in 74 mainland departments was reconstructed between the vaccination ban (2013) and the re-emergence (2015). We showed a striking decrease in seroprevalence with time after the vaccination ban, due to population renewal, which could have facilitated virus transmission leading to the current outbreak situation.
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Affiliation(s)
- N Courtejoie
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - B Durand
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - E Bréard
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - C Sailleau
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - D Vitour
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - S Zientara
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - A Gorlier
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - F Baurier
- Laboratoire départemental d'analyses 18, Bourges, France
| | - C Gourmelen
- Laboratoire départemental d'analyses 37, Tours, France
| | | | | | - C Milard
- Laboratoire départemental d'analyses 69, Marcy-L'Etoile, France
| | | | - C Pagneux
- Eurofins Laboratoire Cœur de France, Moulins, France
| | - C Viarouge
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
| | - G Zanella
- ANSES (French Agency for Food, Environmental and Occupational Health and Safety), Université Paris-Est, Maisons-Alfort, France
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43
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Tauscher K, Wernike K, Fischer M, Wegelt A, Hoffmann B, Teifke JP, Beer M. Characterization of Simbu serogroup virus infections in type I interferon receptor knock-out mice. Arch Virol 2017; 162:3119-3129. [DOI: 10.1007/s00705-017-3475-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Accepted: 06/05/2017] [Indexed: 11/29/2022]
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Sailleau C, Viarouge C, Breard E, Vitour D, Zientara S. Ring trial 2016 for Bluetongue virus detection by real-time RT-PCR in France. Vet Med Sci 2017; 3:107-114. [PMID: 28713579 PMCID: PMC5488199 DOI: 10.1002/vms3.63] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 02/24/2017] [Accepted: 02/28/2017] [Indexed: 11/29/2022] Open
Abstract
Since the unexpected emergence of BTV‐8 in Northern Europe and the incursion of BTV‐8 and 1 in France in 2006–2007, molecular diagnosis has considerably evolved. Several real‐time RT‐PCR (rtRT‐PCR) methods have been developed and published, and are currently being used in many countries across Europe for BTV detection and typing. In France, the national reference laboratory (NRL) for orbiviruses develops and validates ‘ready‐to‐use’ kits with private companies for viral RNA detection. The regional laboratories network that was set up to deal with a heavy demand for analyses has used these available kits. From 2007, ring tests were organized to monitor the performance of the French laboratories. This study presents the results of 63 regional laboratories in the ring trial organized in 2016. Blood samples were sent to the laboratories. Participants were asked to use the rtRT‐PCR methods in place in their laboratory, for detection of all BTV serotypes and specifically BTV‐8. The French regional laboratories are able to detect and genotype BTV in affected animals. Despite the use of several methods (i.e. RNA extraction and different commercial rtRT‐PCRs), the network is homogeneous. The ring trial demonstrated that the French regional veterinary laboratories have reliable and robust BTV diagnostic tools for BTV genome detection.
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Affiliation(s)
- Corinne Sailleau
- ANSES/INRA/ENVA-UPECUMR 1161 Virologie14 rue Pierre et Marie CURIE-94700Maisons AlfortFrance
| | - Cyril Viarouge
- ANSES/INRA/ENVA-UPECUMR 1161 Virologie14 rue Pierre et Marie CURIE-94700Maisons AlfortFrance
| | - Emmanuel Breard
- ANSES/INRA/ENVA-UPECUMR 1161 Virologie14 rue Pierre et Marie CURIE-94700Maisons AlfortFrance
| | - Damien Vitour
- ANSES/INRA/ENVA-UPECUMR 1161 Virologie14 rue Pierre et Marie CURIE-94700Maisons AlfortFrance
| | - Stephan Zientara
- ANSES/INRA/ENVA-UPECUMR 1161 Virologie14 rue Pierre et Marie CURIE-94700Maisons AlfortFrance
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45
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Abstract
The performance of different bluetongue control measures related to both vaccination and protection from bluetongue virus (BTV) vectors was assessed. By means of a mathematical model, it was concluded that when vaccination is applied on 95% of animals even for 3 years, bluetongue cannot be eradicated and is able to re‐emerge. Only after 5 years of vaccination, the infection may be close to the eradication levels. In the absence of vaccination, the disease can persist for several years, reaching an endemic condition with low level of prevalence of infection. Among the mechanisms for bluetongue persistence, the persistence in the wildlife, the transplacental transmission in the host, the duration of viraemia and the possible vertical transmission in vectors were assessed. The criteria of the current surveillance scheme in place in the EU for demonstration of the virus absence need revision, because it was highlighted that under the current surveillance policy bluetongue circulation might occur undetected. For the safe movement of animals, newborn ruminants from vaccinated mothers with neutralising antibodies can be considered protected against infection, although a protective titre threshold cannot be identified. The presence of colostral antibodies interferes with the vaccine immunisation in the newborn for more than 3 months after birth, whereas the minimum time after vaccination of animal to be considered immune can be up to 48 days. The knowledge about vectors ecology, mechanisms of over‐wintering and criteria for the seasonally vector‐free period was updated. Some Culicoides species are active throughout the year and an absolute vector‐free period may not exist at least in some areas in Europe. To date, there is no evidence that the use of insecticides and repellents reduce the transmission of BTV in the field, although this may reduce host/vector contact. By only using pour‐on insecticides, protection of animals is lower than the one provided by vector‐proof establishments. This publication is linked to the following EFSA Supporting Publications article: http://onlinelibrary.wiley.com/doi/10.2903/sp.efsa.2017.EN-1182/full, http://onlinelibrary.wiley.com/doi/10.2903/sp.efsa.2017.EN-1171/full
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Bessell PR, Searle KR, Auty HK, Handel IG, Purse BV, Bronsvoort BMDC. Assessing the potential for Bluetongue virus 8 to spread and vaccination strategies in Scotland. Sci Rep 2016; 6:38940. [PMID: 27958339 PMCID: PMC5154200 DOI: 10.1038/srep38940] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 11/16/2016] [Indexed: 12/11/2022] Open
Abstract
Europe has seen frequent outbreaks of Bluetongue (BT) disease since 2006, including an outbreak of BT virus serotype 8 in central France during 2015 that has continued to spread in Europe during 2016. Thus, assessing the potential for BTv-8 spread and determining the optimal deployment of vaccination is critical for contingency planning. We developed a spatially explicit mathematical model of BTv-8 spread in Scotland and explored the sensitivity of transmission to key disease spread parameters for which detailed empirical data is lacking. With parameters at mean values, there is little spread of BTv-8 in Scotland. However, under a “worst case” but still feasible scenario with parameters at the limits of their ranges and temperatures 1 °C warmer than the mean, we find extensive spread with 203,000 sheep infected given virus introduction to the south of Scotland between mid-May and mid-June. Strategically targeted vaccine interventions can greatly reduce BT spread. Specifically, despite BT having most clinical impact in sheep, we show that vaccination can have the greatest impact on reducing BTv infections in sheep when administered to cattle, which has implications for disease control policy.
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Affiliation(s)
- Paul R Bessell
- The Roslin Institute, The University of Edinburgh, Easter Bush, EH25 9RG, UK
| | - Kate R Searle
- Centre for Ecology and Hydrology, Edinburgh, EH26 0QB, UK
| | - Harriet K Auty
- Epidemiology Research Unit, Future Farming Systems Group, Scotland's Rural College (SRUC), An Lòchran, Inverness Campus, Inverness, IV2 5NA, UK
| | - Ian G Handel
- Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush, EH25 9RG, UK
| | - Bethan V Purse
- Centre for Ecology and Hydrology, Wallingford, OX10 8BB, UK
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47
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Stokes JE, Baylis M, Duncan JS. A freedom from disease study: Schmallenberg virus in the south of England in 2015. Vet Rec 2016; 179:435. [PMID: 27729590 PMCID: PMC5136694 DOI: 10.1136/vr.103903] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2016] [Indexed: 01/02/2023]
Abstract
In 2011-2012, northern European livestock faced a threat from a newly emerged virus, Schmallenberg virus (SBV), only a few years after a major outbreak of bluetongue serotype 8 (BTV-8). Like BTV-8, SBV is transmitted by Culicoides biting midges to ruminants and spread throughout Europe. SBV, however, spread faster, reaching the UK within three months of initial discovery. Adult ruminants show only mild, if any, clinical signs; however, infection of naive ruminants by SBV during the vulnerable period of gestation leads to abortions, stillbirths and fetal malformations. Although some data exist for the prevalence of SBV on UK sheep farms early in the outbreak, we have no information on its current status. Is SBV still circulating in the UK? To answer this, the authors designed a freedom from disease study across the southernmost counties of the UK. During autumn 2015, 1444 sheep, from 131 farms, were tested for antibodies against SBV by ELISA; 5 samples from 4 farms were twice found positive by ELISA but were later confirmed negative by virus neutralisation test. As the sheep were born between October 2014 and April 2015, the authors conclude that it is unlikely that SBV is still circulating in the south of England.
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Affiliation(s)
- Jessica Eleanor Stokes
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - Matthew Baylis
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - Jennifer Sarah Duncan
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
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48
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Post-epidemic Schmallenberg virus circulation: parallel bovine serological and Culicoides virological surveillance studies in Ireland. BMC Vet Res 2016; 12:234. [PMID: 27756302 PMCID: PMC5069804 DOI: 10.1186/s12917-016-0865-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 10/07/2016] [Indexed: 11/29/2022] Open
Abstract
Background Schmallenberg virus (SBV) emerged in northern-Europe in 2011 resulting in an epidemic of ruminant abortions and congenital malformations throughout the continent. In the years following the epidemic there have been reports of SBV overwintering and continued circulation in several European countries. When the population-level of immunity declines in exposed regions, re-introduction of SBV could result in further outbreaks of Schmallenberg disease. The aims of this study were to determine the SBV seroprevalence in previously exposed Irish dairy herds in 2014 and to investigate if SBV continued to circulate in these herds in the three years (2013–2015) following the Irish Schmallenberg epidemic. Whole-herd SBV serosurveillance was conducted in 26 herds before (spring) and following the 2014 vector-season (winter), and following the 2015 vector-season (winter). In spring 2014, 5,531 blood samples were collected from 4,070 cows and 1,461 heifers. In winter 2014, 2,483 blood samples were collected from 1,550 youngstock (8–10 months old) and a subsample (n = 933; 288 cows, 645 heifers) of the seronegative animals identified in the spring. Youngstock were resampled in winter 2015. Culicoides spp. were collected in 10 herds during the 2014 vector-season and analysed for SBV; a total of 138 pools (3,048 Culicoides) from 6 SBV vector species were tested for SBV RNA using real-time PCR. Results In spring 2014, animal-level seroprevalence was 62.5 % (cows = 84.7 %; heifers = 0.6 %). Within-herd seroprevalence ranged widely from 8.5 %–84.1 % in the 26 herds. In winter 2014, 22 animals (0.9 %; 10 cows, 5 heifers, 7 youngstock) originating in 17 herds (range 1–4 animals/herd) tested seropositive. In winter 2015 all youngstock, including the 7 seropositive animals in winter 2014, tested seronegative suggesting their initial positive result was due to persistence of maternal antibodies. All of the Culicoides pools examined tested negative for SBV-RNA. Conclusions SBV appears to have recirculated at a very low level in these herds during 2013 and 2014, while there was no evidence of SBV infection in naïve youngstock during 2015. A large population of naïve animals was identified and may be at risk of infection in future years should SBV re-emerge and recirculate as it has done in continental Europe.
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Breard E, Garnier A, Despres P, Blaise Boisseau S, Comtet L, Viarouge C, Bakkali-Kassimi L, Pourquier P, Hudelet P, Vitour D, Rossi S, Belbis G, Sailleau C, Zientara S. Development of a Double-Antigen Microsphere Immunoassay for Simultaneous Group and Serotype Detection of Bluetongue Virus Antibodies. Transbound Emerg Dis 2016; 64:1837-1847. [PMID: 27667484 DOI: 10.1111/tbed.12578] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Indexed: 11/30/2022]
Abstract
Bluetongue viruses (BTV) are arboviruses responsible for infections in ruminants. The confirmation of BTV infections is based on rapid serological tests such as enzyme-linked immunosorbent assays (ELISAs) using the BTV viral protein 7 (VP7) as antigen. The determination of the BTV serotype by serological analyses could be only performed by neutralization tests (VNT) which are time-consuming and require BSL3 facilities. VP2 protein is considered the major serotype-defining protein of BTV. To improve the serological characterization of BTV infections, the recombinant VP7 and BTV serotype 8 (BTV-8) VP2 were synthesized using insect cells expression system. The purified antigens were covalently bound to fluorescent beads and then assayed with 822 characterized ruminant sera from BTV vaccinations or infections in a duplex microsphere immunoassay (MIA). The revelation step of this serological duplex assay was performed with biotinylated antigens instead of antispecies conjugates to use it on different ruminant species. The results demonstrated that MIA detected the anti-VP7 antibodies with a high specificity as well as a competitive ELISA approved for BTV diagnosis, with a better efficiency for the early detection of the anti-VP7 antibodies. The VP2 MIA results showed that this technology is also an alternative to VNT for BTV diagnosis. Comparisons between the VP2 MIA and VNT results showed that VNT detects the anti-VP2 antibodies in an early stage and that the VP2 MIA is as specific as VNT. This novel immunoassay provides a platform for developing multiplex assays, in which the presence of antibodies against multiple BTV serotypes can be detected simultaneously.
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Affiliation(s)
- E Breard
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | - A Garnier
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | - P Despres
- UMR PIMIT (I2T), Université de La Réunion, INSERM U1187, CNRS 9192, IRD 249, technology platform CYROI, Saint-Clotilde, La Reunion, France
| | - S Blaise Boisseau
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | | | - C Viarouge
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | - L Bakkali-Kassimi
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | | | | | - D Vitour
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | - S Rossi
- Unité Sanitaire de la Faune, Office National de la Chasse et de la Faune Sauvage, Gap, France
| | - G Belbis
- Unité de Pathologie du Bétail, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, Maisons-Alfort, France
| | - C Sailleau
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
| | - S Zientara
- UMR 1161 VIROLOGIE ANSES-INRA-ENVA, Université Paris Est, ANSES, Maisons-Alfort, France
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Martinelle L, Dal Pozzo F, Sarradin P, Van Campe W, De Leeuw I, De Clercq K, Thys C, Thiry E, Saegerman C. Experimental bluetongue virus superinfection in calves previously immunized with bluetongue virus serotype 8. Vet Res 2016; 47:73. [PMID: 27465686 PMCID: PMC4964278 DOI: 10.1186/s13567-016-0357-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 06/28/2016] [Indexed: 11/10/2022] Open
Abstract
The effect of a superinfection with bluetongue virus serotype 1 (BTV1) was evaluated on two groups of four calves. One group received a commercial inactivated BTV serotype 8 (BTV8) vaccine. This group and the non-vaccinated group of calves were challenged twice (4 months apart) with the European BTV8 strain isolated during the 2006–2007 epidemics. Calves were then infected with a BTV1 inoculum which was found to be unexpectedly contaminated by BTV serotype 15 (BTV15). BTV1 and BTV15 single infections were performed on two other groups of three BTV naïve calves. A severe clinical picture was obtained after superinfection with BTV1/BTV15 in both vaccinated and non-vaccinated animals and after challenge with BTV8 in non-vaccinated animals. BTV1 and BTV15 single infection caused only very slight clinical signs. After superinfection and at the viraemic peak, there were an average of above 1000 times more BTV15 genomic copies than BTV1 ones. BTV1 RNA could be detected only in the spleen of one calf whereas BTV15 RNA was found in 15 organs of seven different animals. BTV8 immunization whether it was acquired through vaccination and challenges or challenges alone did not change BTV1 or BTV15 RNA detection in superinfected animals. However in these animals a partial cross neutralization between BTV8 and BTV1 might be involved in the lower BTV1 replication versus BTV15. Infection with different serotypes can occur also in the field. Interference between virus strains, genetic reassortment and cross-protection were considered as mechanisms to explain the clinical outcomes and the other virological and immunological findings in the course of BTV1/BTV15 superinfection.
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Affiliation(s)
- Ludovic Martinelle
- Research Unit in Epidemiology and Risk Analysis Applied to the Veterinary Sciences (UREAR-ULg), Department of Infectious and Parasitic Diseases, Center for Fundamental and Applied Research for Animal and Health (FARAH), Faculty of Veterinary Medicine, University of Liege, Quartier Vallée 2, Avenue de Cureghem 7A, B42, 4000, Liège, Belgium
| | - Fabiana Dal Pozzo
- Research Unit in Epidemiology and Risk Analysis Applied to the Veterinary Sciences (UREAR-ULg), Department of Infectious and Parasitic Diseases, Center for Fundamental and Applied Research for Animal and Health (FARAH), Faculty of Veterinary Medicine, University of Liege, Quartier Vallée 2, Avenue de Cureghem 7A, B42, 4000, Liège, Belgium
| | - Pierre Sarradin
- INRA, UE 1277, Experimental Infectiology Platform, INRA-Research Centre of Tours, Nouzilly, France
| | - Willem Van Campe
- Animal Experimental Centre, CODA-CERVA, Kerklaan 68, 1830, Machelen, Belgium
| | - Ilse De Leeuw
- Unit Vesicular and Exotic Diseases, CODA-CERVA, Groeselenberg 99, Uccle, 1180, Brussels, Belgium
| | - Kris De Clercq
- Unit Vesicular and Exotic Diseases, CODA-CERVA, Groeselenberg 99, Uccle, 1180, Brussels, Belgium
| | - Christine Thys
- Research Unit in Epidemiology and Risk Analysis Applied to the Veterinary Sciences (UREAR-ULg), Department of Infectious and Parasitic Diseases, Center for Fundamental and Applied Research for Animal and Health (FARAH), Faculty of Veterinary Medicine, University of Liege, Quartier Vallée 2, Avenue de Cureghem 7A, B42, 4000, Liège, Belgium
| | - Etienne Thiry
- Veterinary Virology and Animal Viral Diseases, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, Center for Fundamental and Applied Research for Animal and Health (FARAH), University of Liege, Quartier Vallée 2, Avenue de Cureghem 10, B43bis, 4000, Liège, Belgium
| | - Claude Saegerman
- Research Unit in Epidemiology and Risk Analysis Applied to the Veterinary Sciences (UREAR-ULg), Department of Infectious and Parasitic Diseases, Center for Fundamental and Applied Research for Animal and Health (FARAH), Faculty of Veterinary Medicine, University of Liege, Quartier Vallée 2, Avenue de Cureghem 7A, B42, 4000, Liège, Belgium.
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