A field investigation of an African horse sickness outbreak in the controlled area of South Africa in 2016

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dc.contributor.author Grewar, John Duncan
dc.contributor.author Weyer, Camilla Theresa
dc.contributor.author Venter, Gert Johannes
dc.contributor.author Van Helden, Lesley Susan
dc.contributor.author Burger, Phillippa
dc.contributor.author Guthrie, Alan John
dc.contributor.author Coetzee, Peter
dc.contributor.author Labuschagne, Karien
dc.contributor.author Buhrmann, Gary
dc.contributor.author Parker, Beverley Joan
dc.contributor.author Thompson, P.N. (Peter N.)
dc.date.accessioned 2020-01-29T05:14:44Z
dc.date.issued 2019-03
dc.description.abstract An outbreak of African horse sickness (AHS) caused by AHS virus type 1 occurred within the South African AHS surveillance zone during April and May 2016. The index case was detected by a private veterinarian through passive surveillance. There were 21 cases in total, which is relatively low compared to case totals during prior AHS outbreaks in the same region (and of the same AHS virus type) in 2004, 2011 and 2014. The affected proportion of horses on affected properties was 0.07 (95% CI 0.04, 0.11). Weather conditions were conducive to high midge activity immediately prior to the outbreak but midge numbers decreased rapidly with the advent of winter. The outbreak was localized, with 18 of the 21 cases occurring within 8 km of the index property and the three remaining cases on two properties within 21 km of the index property, with direction of spread consistent with wind‐borne dispersion of infected midges. Control measures included implementation of a containment zone with movement restrictions on equids. The outbreak was attributed to a reversion to virulence of a live attenuated vaccine used extensively in South Africa. Outbreaks in the AHS control zones have a major detrimental impact on the direct export of horses from South Africa, notably to the European Union. en_ZA
dc.description.department Equine Research Centre en_ZA
dc.description.department Production Animal Studies en_ZA
dc.description.embargo 2020-03-01
dc.description.librarian hj2020 en_ZA
dc.description.sponsorship The Equine Health Fund–Wits Health Consortium (Pty) Ltd and the Equine Research Centre (University of Pretoria). en_ZA
dc.description.uri http://wileyonlinelibrary.com/journal/tbed en_ZA
dc.identifier.citation Grewar JD, Weyer CT, Venter GJ, et al. A field investigation of an African horse sickness outbreak in the controlled area of South Africa in 2016. Transboundary and Emerging Diseases 2019;66:743–751. https://doi.org/10.1111/tbed.13077. en_ZA
dc.identifier.issn 1865-1674 (print)
dc.identifier.issn 1865-1682 (online)
dc.identifier.other 10.1111/tbed.13077
dc.identifier.uri http://hdl.handle.net/2263/72999
dc.language.iso en en_ZA
dc.publisher Wiley en_ZA
dc.rights © 2019 Blackwell Verlag GmbH. Transboundary and Emerging Diseases. This is the pre-peer reviewed version of the following article : A field investigation of an African horse sickness outbreak in the controlled area of South Africa in 2016. Transboundary and Emerging Diseases 2019;66:743–751. https://doi.org/10.1111/tbed.13077. The definite version is available at : http://wileyonlinelibrary.com/journal/tbed. en_ZA
dc.subject African horse sickness type 1 en_ZA
dc.subject African horse sickness (AHS) en_ZA
dc.subject Culicoides en_ZA
dc.subject Disease outbreak en_ZA
dc.subject Horse (Equus caballus) en_ZA
dc.subject South Africa (SA) en_ZA
dc.title A field investigation of an African horse sickness outbreak in the controlled area of South Africa in 2016 en_ZA
dc.type Postprint Article en_ZA


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