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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Comparison of African swine fever virus prevalence and risk in two contrasting pig-farming systems in South-west and Central Kenya
Preventive Veterinary Medicine, Volume 110, No. 2, Year 2013
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Description
We describe a horizontal survey of African swine fever virus (ASFV) prevalence and risk factors associated with virus infection in domestic pigs in two contrasting production systems in Kenya. A free range/tethering, low input production system in Ndhiwa District of South-western Kenya is compared with a medium input stall fed production system in Kiambu District of Central Kenya. Analysis of variance (ANOVA) of data derived from cluster analysis showed that number of animals, number of breeding sows and number of weaner pigs were a significant factor in classifying farms in Nhiwa and Kiambu. Analysis of blood and serum samples using a PCR assay demonstrated an average animal level positivity to ASFV of 28% in two independent samplings in South-western Kenya and 0% PCR positivity in Central Kenya. No animals were sero-positive in either study site using the OIE indirect-ELISA and none of the animals sampled exhibited clinical symptoms of ASF. The farms that contained ASFV positive pigs in Ndhiwa District were located in divisions bordering the Ruma National Park from which bushpig (Potamochoerus larvatus) incursions into farms had been reported. ASFV prevalence (P<0.05) was significantly higher at distances between 6 and 16. km from the National Park than at distances closer or further away. One of the 8 bushpigs sampled from the park, from which tissues were obtained was PCR positive for ASFV. The data therefore indicated a potential role for the bushpig in virus transmission in South-western Kenya, but there was no evidence of a direct sylvatic virus transmission cycle in Central Kenya. ASF control strategies implemented in these areas will need to take these epidemiological findings into consideration. © 2012 Elsevier B.V.
Authors & Co-Authors
Okoth, E. A.
Kenya, Nairobi
International Livestock Research Institute Nairobi
Gallardo, Carmina
Spain, Valdeolmos
Csic-inia-cisa - Centro de Investigación en Sanidad Animal
MacHaria, Joseph M.K.
Kenya
Ministry of Livestock
Omore, Amos O.
Kenya, Nairobi
International Livestock Research Institute Nairobi
Pelayo, V.
Spain, Valdeolmos
Csic-inia-cisa - Centro de Investigación en Sanidad Animal
Bulimo, D. W.
Kenya, Nairobi
University of Nairobi
Arias, M.
Spain, Valdeolmos
Csic-inia-cisa - Centro de Investigación en Sanidad Animal
Kitala, Phillip Mwanzia
Kenya, Nairobi
University of Nairobi
Baboon, K.
Kenya
Ministry of Livestock
Lekolol, I.
Kenya, Nairobi
Kenya Wildlife Service
Mijele, Dominic
Kenya, Nairobi
Kenya Wildlife Service
Bishop, Richard Peter
Kenya, Nairobi
International Livestock Research Institute Nairobi
Statistics
Citations: 53
Authors: 12
Affiliations: 5
Identifiers
Doi:
10.1016/j.prevetmed.2012.11.012
ISSN:
01675877
Study Design
Cross Sectional Study
Study Approach
Quantitative
Study Locations
Kenya