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 ...19958593398
an introductory survey of helminth control practices in south africa and anthelmintic resistance on thoroughbred stud farms in the western cape province.fifty-one per cent of 110 questionnaires, designed for obtaining information on helminth control practices and management on thoroughbred stud farms in south africa, were completed by farmers during 2000. the number of horses per farm included in the questionnaire survey ranged from 15 to 410. foals, yearlings and adult horses were treated with anthelmintics at a mean of 7.3 +/- 3.0, 6.6 +/- 2.7 and 5.3 +/- 2.3 times per year, respectively. an average of 3.4 different drugs were used annually, w ...200212665133
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 ...200312782364
helminths in horses: use of selective treatment for the control of strongyles.the current level of anthelmintic resistance in the horse-breeding industry is extremely high and therefore more emphasis is being placed on studies that focus on the judicious use of anthelmintic products. the aims of the study were to: 1) establish if there is variation in the egg excretion pattern of strongyles between the different age classes of thoroughbred horses in the western cape province (wcp), 2) test if a selective treatment approach successfully reduces the number of anthelmintic t ...200415628805
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- ...200617361773
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 ...200617458343
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 ...200818420793
annual ryegrass toxicity in thoroughbred horses in ceres in the western cape province, south outbreak of annual ryegrass toxicity occurred on a thoroughbred stud in ceres in the western cape province of south africa. this is the 1st report of annual ryegrass toxicity in horses in south africa, although the condition has been reported in cattle and sheep populations in the past. annual ryegrass toxicity is characterised by a variety of neurological signs including tremors, convulsions, recumbency and in many cases death. the description of the outbreak includes the history, clinical p ...200920458861
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