Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018
African swine fever (ASF) is a contagious viral disease of swine worldwide. ASF in South Africa has for many years been confined to a controlled area in the northeast of the country that was proclaimed in 1935. Since 2012, outbreaks are more likely to occur in the historically ASF-free area. This study aimed to analyse the spatial and spatiotemporal structure of ASF outbreaks in South Africa between 1993 and 2018. Global space-time clustering of ASF outbreaks was investigated by the Diggle space-time K-function while Kulldorff's spatial scan statistic was applied to detect local cluster of ASF outbreaks. Globally, ASF outbreaks exhibit statistically significant spatial clustering. They have shown a significant negative space-time interaction at month scale (p = 0.003) but no significant space-time interaction at year scale (p = 0.577), revealing strong evidence that ASF cases that are close in space occur in months which are close and vice versa. In studying local area space-time clustering at both month and year scale, three significant local clusters associated with high-rate were detected. These clusters are localised in both the ASF-controlled area and outside the controlled area with radius varying from 60.84 km up to 271.43 km and risk ratio varying from 6.61 up to 17.70. At month scale, clusters with more outbreaks were observed between June 2017 and August 2017 and involved 22 outbreaks followed by the cluster that involved 13 outbreaks in January 2012. These results show the need to maintain high biosecurity standards on pig farms in both inside and outside the ASF-controlled areas.
Main Authors: | , , |
---|---|
Format: | article biblioteca |
Language: | eng |
Subjects: | L73 - Maladies des animaux, L70 - Sciences et hygiène vétérinaires - Considérations générales, peste porcine africaine, virus peste porcine africaine, épidémiologie, analyse spatiale, santé animale, http://aims.fao.org/aos/agrovoc/c_26754, http://aims.fao.org/aos/agrovoc/c_8649, http://aims.fao.org/aos/agrovoc/c_2615, http://aims.fao.org/aos/agrovoc/c_40da9d3b, http://aims.fao.org/aos/agrovoc/c_431, http://aims.fao.org/aos/agrovoc/c_7252, |
Online Access: | http://agritrop.cirad.fr/603378/ http://agritrop.cirad.fr/603378/1/603378.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-cirad-fr-603378 |
---|---|
record_format |
koha |
spelling |
dig-cirad-fr-6033782024-04-23T06:54:37Z http://agritrop.cirad.fr/603378/ http://agritrop.cirad.fr/603378/ Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018. Mushagalusa Ciza A., Penrith Mary-Louise, Etter Eric. 2022. Journal of the South African Veterinary Association, 93 (2) : 92-98.https://doi.org/10.36303/JSAVA.2022.93.1.161 <https://doi.org/10.36303/JSAVA.2022.93.1.161> Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 Mushagalusa, Ciza A. Penrith, Mary-Louise Etter, Eric eng 2022 Journal of the South African Veterinary Association L73 - Maladies des animaux L70 - Sciences et hygiène vétérinaires - Considérations générales peste porcine africaine virus peste porcine africaine épidémiologie analyse spatiale santé animale http://aims.fao.org/aos/agrovoc/c_26754 http://aims.fao.org/aos/agrovoc/c_8649 http://aims.fao.org/aos/agrovoc/c_2615 http://aims.fao.org/aos/agrovoc/c_40da9d3b http://aims.fao.org/aos/agrovoc/c_431 Afrique du Sud http://aims.fao.org/aos/agrovoc/c_7252 African swine fever (ASF) is a contagious viral disease of swine worldwide. ASF in South Africa has for many years been confined to a controlled area in the northeast of the country that was proclaimed in 1935. Since 2012, outbreaks are more likely to occur in the historically ASF-free area. This study aimed to analyse the spatial and spatiotemporal structure of ASF outbreaks in South Africa between 1993 and 2018. Global space-time clustering of ASF outbreaks was investigated by the Diggle space-time K-function while Kulldorff's spatial scan statistic was applied to detect local cluster of ASF outbreaks. Globally, ASF outbreaks exhibit statistically significant spatial clustering. They have shown a significant negative space-time interaction at month scale (p = 0.003) but no significant space-time interaction at year scale (p = 0.577), revealing strong evidence that ASF cases that are close in space occur in months which are close and vice versa. In studying local area space-time clustering at both month and year scale, three significant local clusters associated with high-rate were detected. These clusters are localised in both the ASF-controlled area and outside the controlled area with radius varying from 60.84 km up to 271.43 km and risk ratio varying from 6.61 up to 17.70. At month scale, clusters with more outbreaks were observed between June 2017 and August 2017 and involved 22 outbreaks followed by the cluster that involved 13 outbreaks in January 2012. These results show the need to maintain high biosecurity standards on pig farms in both inside and outside the ASF-controlled areas. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/603378/1/603378.pdf text cc_by_nc info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc/4.0/ https://doi.org/10.36303/JSAVA.2022.93.1.161 10.36303/JSAVA.2022.93.1.161 info:eu-repo/semantics/altIdentifier/doi/10.36303/JSAVA.2022.93.1.161 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.36303/JSAVA.2022.93.1.161 info:eu-repo/semantics/reference/purl/https://www.jsava.co.za/index.php/jsava/article/view/161 info:eu-repo/grantAgreement/////(USA) Unravelling the Effect of Contact Networks & Socio- Economic Factors in the Emergence of Infectious Diseases at the Wild-Domestic Interface/ |
institution |
CIRAD FR |
collection |
DSpace |
country |
Francia |
countrycode |
FR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-cirad-fr |
tag |
biblioteca |
region |
Europa del Oeste |
libraryname |
Biblioteca del CIRAD Francia |
language |
eng |
topic |
L73 - Maladies des animaux L70 - Sciences et hygiène vétérinaires - Considérations générales peste porcine africaine virus peste porcine africaine épidémiologie analyse spatiale santé animale http://aims.fao.org/aos/agrovoc/c_26754 http://aims.fao.org/aos/agrovoc/c_8649 http://aims.fao.org/aos/agrovoc/c_2615 http://aims.fao.org/aos/agrovoc/c_40da9d3b http://aims.fao.org/aos/agrovoc/c_431 http://aims.fao.org/aos/agrovoc/c_7252 L73 - Maladies des animaux L70 - Sciences et hygiène vétérinaires - Considérations générales peste porcine africaine virus peste porcine africaine épidémiologie analyse spatiale santé animale http://aims.fao.org/aos/agrovoc/c_26754 http://aims.fao.org/aos/agrovoc/c_8649 http://aims.fao.org/aos/agrovoc/c_2615 http://aims.fao.org/aos/agrovoc/c_40da9d3b http://aims.fao.org/aos/agrovoc/c_431 http://aims.fao.org/aos/agrovoc/c_7252 |
spellingShingle |
L73 - Maladies des animaux L70 - Sciences et hygiène vétérinaires - Considérations générales peste porcine africaine virus peste porcine africaine épidémiologie analyse spatiale santé animale http://aims.fao.org/aos/agrovoc/c_26754 http://aims.fao.org/aos/agrovoc/c_8649 http://aims.fao.org/aos/agrovoc/c_2615 http://aims.fao.org/aos/agrovoc/c_40da9d3b http://aims.fao.org/aos/agrovoc/c_431 http://aims.fao.org/aos/agrovoc/c_7252 L73 - Maladies des animaux L70 - Sciences et hygiène vétérinaires - Considérations générales peste porcine africaine virus peste porcine africaine épidémiologie analyse spatiale santé animale http://aims.fao.org/aos/agrovoc/c_26754 http://aims.fao.org/aos/agrovoc/c_8649 http://aims.fao.org/aos/agrovoc/c_2615 http://aims.fao.org/aos/agrovoc/c_40da9d3b http://aims.fao.org/aos/agrovoc/c_431 http://aims.fao.org/aos/agrovoc/c_7252 Mushagalusa, Ciza A. Penrith, Mary-Louise Etter, Eric Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 |
description |
African swine fever (ASF) is a contagious viral disease of swine worldwide. ASF in South Africa has for many years been confined to a controlled area in the northeast of the country that was proclaimed in 1935. Since 2012, outbreaks are more likely to occur in the historically ASF-free area. This study aimed to analyse the spatial and spatiotemporal structure of ASF outbreaks in South Africa between 1993 and 2018. Global space-time clustering of ASF outbreaks was investigated by the Diggle space-time K-function while Kulldorff's spatial scan statistic was applied to detect local cluster of ASF outbreaks. Globally, ASF outbreaks exhibit statistically significant spatial clustering. They have shown a significant negative space-time interaction at month scale (p = 0.003) but no significant space-time interaction at year scale (p = 0.577), revealing strong evidence that ASF cases that are close in space occur in months which are close and vice versa. In studying local area space-time clustering at both month and year scale, three significant local clusters associated with high-rate were detected. These clusters are localised in both the ASF-controlled area and outside the controlled area with radius varying from 60.84 km up to 271.43 km and risk ratio varying from 6.61 up to 17.70. At month scale, clusters with more outbreaks were observed between June 2017 and August 2017 and involved 22 outbreaks followed by the cluster that involved 13 outbreaks in January 2012. These results show the need to maintain high biosecurity standards on pig farms in both inside and outside the ASF-controlled areas. |
format |
article |
topic_facet |
L73 - Maladies des animaux L70 - Sciences et hygiène vétérinaires - Considérations générales peste porcine africaine virus peste porcine africaine épidémiologie analyse spatiale santé animale http://aims.fao.org/aos/agrovoc/c_26754 http://aims.fao.org/aos/agrovoc/c_8649 http://aims.fao.org/aos/agrovoc/c_2615 http://aims.fao.org/aos/agrovoc/c_40da9d3b http://aims.fao.org/aos/agrovoc/c_431 http://aims.fao.org/aos/agrovoc/c_7252 |
author |
Mushagalusa, Ciza A. Penrith, Mary-Louise Etter, Eric |
author_facet |
Mushagalusa, Ciza A. Penrith, Mary-Louise Etter, Eric |
author_sort |
Mushagalusa, Ciza A. |
title |
Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 |
title_short |
Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 |
title_full |
Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 |
title_fullStr |
Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 |
title_full_unstemmed |
Spatiotemporal analysis of African swine fever outbreaks on South African smallholder farms, 1993-2018 |
title_sort |
spatiotemporal analysis of african swine fever outbreaks on south african smallholder farms, 1993-2018 |
url |
http://agritrop.cirad.fr/603378/ http://agritrop.cirad.fr/603378/1/603378.pdf |
work_keys_str_mv |
AT mushagalusacizaa spatiotemporalanalysisofafricanswinefeveroutbreaksonsouthafricansmallholderfarms19932018 AT penrithmarylouise spatiotemporalanalysisofafricanswinefeveroutbreaksonsouthafricansmallholderfarms19932018 AT ettereric spatiotemporalanalysisofafricanswinefeveroutbreaksonsouthafricansmallholderfarms19932018 |
_version_ |
1798165090931834880 |