Prevalence and Virulence of Rhodococcus equi in Sick Foals and Soil of Horse-Breeding Farms in Texas
نویسندگان
چکیده
Rhodococcus equi per se and R. equi containing a virulence-associated plasmid can be cultured with similar frequency from the soil of farms with and without a history of R. equi disease. This finding, in conjunction with variability in results between testing procedures and laboratories, indicates that identification of R. equi by culture from farm soils does not accurately predict the probability of disease on those farms. Authors’ addresses: College of Veterinary Medicine, Texas A&M University, College Station, TX 77843 (Martens, Cohen, Chaffin, and Liu); Kitasato University, Towada, Aomori 034, Japan (Takai); and Texas Veterinary Medical Diagnostic Laboratory, College Station, TX 77843 (Lingsweiler). r 1999 AAEP.
منابع مشابه
Prevalence of virulent Rhodococcus equi in isolates from soil collected from two horse farms in South Africa and restriction fragment length polymorphisms of virulence plasmids in the isolates from infected foals, a dog and a monkey.
The prevalence of virulent Rhodococcus equi in soil isolates from two horse farms in South Africa and nine clinical isolates from six foals, a foal foetus, a dog, and a monkey was investigated. The isolates were tested for the presence of virulence plasmid DNA and 15- to 17-kDa antigens by immunoblotting. Rhodococcus equi was isolated from almost all of the soil samples obtained from the two fa...
متن کاملPlasmid Profiles of Virulent Rhodococcus equi Strains Isolated from Infected Foals in Poland
Rhodococcus equi is an important bacterial pathogen in foals up to 6 months old, widespread in horse farms all over the world. It was found that only virulent R. equi strains expressing 15-17 kDa virulence-associated protein (VapA) and having large virulence plasmid of 85-90 kb containing vapA gene are pathogenic for horses. To date, 12 plasmid types have been reported in VapA positive strains ...
متن کاملMolecular characterization of Rhodococcus equi Isolates of horse breeding farms from an endemic region in South of Brazil by multiplex PCR
Rhodococcus equi is a gram-positive coco-bacillus and an intracellular opportunistic pathogen which causes pneumonia in foals. It is widely detected in environment and has been isolated from several sources, as soil, feces and gut from health and sick foals. The goal of this study was to characterize the epidemiological status (endemic, sporadic or no infection) of horse breeding farms from Bag...
متن کاملAssociations between the ecology of virulent Rhodococcus equi and the epidemiology of R. equi pneumonia on Australian thoroughbred farms.
The ecology of virulent strains of Rhodococcus equi on horse farms is likely to influence the prevalence and severity of R. equi pneumonia in foals. This study examined the association between the ecology of virulent R. equi and the epidemiology of R. equi pneumonia by collecting air and soil samples over two breeding seasons (28 farm-year combinations) on Thoroughbred breeding farms with diffe...
متن کاملQuantitative aspects of fecal Rhodococcus (Corynebacterium) equi in foals.
Quantitative aspects of fecal Rhodococcus (Corynebacterium) equi in newborn foals for 12 weeks after birth were investigated on two horse breeding farms. R. equi was found in the feces of foals during week 1 of life. The greatest numbers of R. equi were present in the feces of foals during the first 8 weeks of their lives, which coincides with the age when foals are most liable to be exposed to...
متن کامل