Blood-feeding, susceptibility to infection with Schmallenberg virus and phylogenetics of Culicoides (Diptera: Ceratopogonidae) from the United Kingdom

Background Culicoides biting midges (Diptera: Ceratopogonidae) are responsible for the biological transmission of internationally important arboviruses of livestock. In 2011, a novel Orthobunyavirus was discovered in northern Europe causing congenital malformations and abortions in ruminants. From field studies, Culicoides were implicated in the transmission of this virus which was subsequently named Schmallenberg virus (SBV), but to date no assessment of susceptibility to infection of field populations under standardised laboratory conditions has been carried out. We assessed the influence of membrane type (chick skin, collagen, Parafilm M®) when offered in conjunction with an artificial blood-feeding system (Hemotek, UK) on field-collected Culicoides blood-feeding rates. Susceptibility to infection with SBV following blood-feeding on an SBV-blood suspension provided via either (i) the Hemotek system or via (ii) a saturated cotton wool pledglet was then compared. Schmallenberg virus susceptibility was defined by RT-qPCR of RNA extractions of head homogenates and related to Culicoides species and haplotype identifications based on the DNA barcode region of the mitochondrial cytochrome c oxidase 1 (cox1) gene. Results Culicoides blood-feeding rates were low across all membrane types tested (7.5% chick skin, 0.0% for collagen, 4.4% Parafilm M®, with 6029 female Culicoides being offered a blood meal in total). Susceptibility to infection with SBV through membrane blood-feeding (8 of 109 individuals tested) and pledglet blood-feeding (1 of 94 individuals tested) was demonstrated for the Obsoletus complex, with both C. obsoletus (Meigen) and C. scoticus Downes & Kettle susceptible to infection with SBV through oral feeding. Potential evidence of cryptic species within UK populations was found for the Obsoletus complex in phylogenetic analyses of cox1 DNA barcodes of 74 individuals assessed from a single field-site. Conclusions Methods described in this study provide the means to blood-feed Palaearctic Culicoides for vector competence studies and colonisation attempts. Susceptibility to SBV infection was 7.3% for membrane-fed members of the subgenus Avaritia and 1.1% for pledglet-fed. Both C. obsoletus and C. scoticus were confirmed as being susceptible to infection with SBV, with potential evidence of cryptic species within UK Obsoletus complex specimens, however the implications of cryptic diversity in the Obsoletus complex on arbovirus transmission remains unknown. Electronic supplementary material The online version of this article (10.1186/s13071-018-2650-x) contains supplementary material, which is available to authorized users.

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PID https://www.doi.org/10.1186/s13071-018-2650-x
PID pmc:PMC6389053
PID pmid:29486789
PID https://www.doi.org/10.5167/uzh-150040
URL http://link.springer.com/content/pdf/10.1186/s13071-018-2650-x.pdf
URL http://dx.doi.org/10.1186/s13071-018-2650-x
URL https://doaj.org/toc/1756-3305
URL https://www.zora.uzh.ch/id/eprint/150040/
URL http://dx.doi.org/10.5167/uzh-150040
URL https://www.ncbi.nlm.nih.gov/pubmed/29486789
URL https://core.ac.uk/display/154260933
URL https://www.zora.uzh.ch/id/eprint/150040/1/s13071-018-2650-x.pdf
URL https://academic.microsoft.com/#/detail/2796361817
URL http://europepmc.org/articles/PMC6389053
URL https://dx.doi.org/10.1186/s13071-018-2650-x
URL https://parasitesandvectors.biomedcentral.com/track/pdf/10.1186/s13071-018-2650-x
URL https://zenodo.org/record/1188490
URL http://link.springer.com/article/10.1186/s13071-018-2650-x
URL https://link.springer.com/article/10.1186/s13071-018-2650-x
URL https://parasitesandvectors.biomedcentral.com/articles/10.1186/s13071-018-2650-x
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Author Simon Gubbins, 0000-0003-0538-4173
Author Eva Veronesi, 0000-0003-3411-7891
Author Lara Harrup, 0000-0001-8828-7349
Author Simon Carpenter, 0000-0001-5775-045X
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Collected From Europe PubMed Central; PubMed Central; ZENODO; ORCID; UnpayWall; Datacite; DOAJ-Articles; Zurich Open Repository and Archive; Crossref; Microsoft Academic Graph
Hosted By Europe PubMed Central; ZENODO; Zurich Open Repository and Archive; Parasites & Vectors
Journal Parasites & Vectors, ,
Publication Date 2018-02-27
Publisher BMC
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Country Switzerland
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Language English
Resource Type Other literature type; Article; UNKNOWN
keyword 570 Life sciences; biology
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Source https://science-innovation-policy.openaire.eu/search/publication?articleId=dedup_wf_001::a8bfab6ba23ec6857185bc6f19ac904e
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Last Updated 27 December 2020, 03:07 (CET)
Created 27 December 2020, 03:07 (CET)