| african horse sickness surveillance systems and regionalisation/zoning: the case of south africa. | central and southern africa are generally regarded as being endemic areas for african horse sickness (ahs). with the advent of the concepts of risk analysis and regionalisation/zoning, however, the possibility has now arisen of establishing 'zones' within south africa for ahs surveillance purposes. in 1993, a protocol was submitted to the european community (now european union: eu), proposing the establishment of an ahs-free zone in the cape peninsula. the proposal is based on historical evidenc ... | 1995 | 8593398 |
| molecular epidemiology of the african horse sickness virus s10 gene. | between 2004 and 2006, 145 african horse sickness viruses (ahsv) were isolated from blood and organ samples submitted from south africa to the faculty of veterinary science, university of pretoria. all nine serotypes were represented, with a range of 3-60 isolates per serotype. the rna small segment 10 (s10) nucleotide sequences of these isolates were determined and the phylogeny investigated. ahsv, bluetongue virus (btv) and equine encephalosis virus (eev) all formed monophyletic groups and btv ... | 2008 | 18420793 |
| an epidemiological investigation of the african horsesickness outbreak in the western cape province of south africa in 2004 and its relevance to the current equine export protocol. | african horsesickness (ahs) is a controlled disease in south africa. the country is divided into an infected area and a control area. an outbreak of ahs in the control area can result in a ban of exports for at least 2 years. a retrospective epidemiological study was carried out on data collected during the 2004 ahs outbreak in the surveillance zone of the ahs control area in the western cape province. the objective of this study was to describe the 2004 outbreak and compare it with the 1999 ahs ... | 2006 | 17458343 |
| investigations on outbreaks of african horse sickness in the surveillance zone in south africa. | confirmed outbreaks of african horse sickness (ahs) occurred in the surveillance zone of the western cape in 1999 and 2004, both of which led to a two-year suspension on the export of horses. light trap surveys in the outbreak areas showed that known vector competent culicoides species, notably c. imicola, were abundant and present in numbers equal to those in the traditional ahs endemic areas. isolations of ahs virus serotypes 1 and 7, equine encephalosis virus, and bluetongue virus from field- ... | 2006 | 17361773 |
| vp2 gene phylogenetic characterization of field isolates of african horsesickness virus serotype 7 circulating in south africa during the time of the 1999 african horsesickness outbreak in the western cape. | we present the first vp2-gene phylogenetic analysis of african horsesickness (ahs) viruses within a serotype. thirteen ahsv 7 isolates were obtained from cases that occurred in south africa during 1998-1999, and three were historical ahsv 7 isolates. the goals were to start a database of isolates of known location and time of isolation and to determine if we could identify the origin of an ahs outbreak in the surveillance area in the western cape. we prepared full-length cdna copies of the vp2-g ... | 2003 | 12782364 |