Nested polymerase chain reaction for detection of Ehrlichia risticii genomic DNA in infected horses.
A nested polymerase chain reaction was developed for amplifying a 529-bp segment of the 16S ribosomal RNA gene of Ehrlichia risticii from equine buffy coat cells. Confirmation of identity of the amplified bands was accomplished by Southern hybridization and DNA sequencing. The study indicated a detection limit of > 10 copies of the target gene, and specificity for E. risticii as based on a panel of test rickettsiae. Ticks (Ixodes pacificus) collected in an area of northern California enzootic for equine monocytic ehrlichiosis were found to be negative for E. risticii DNA.
Barlough
J E
JE
Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis 95616, USA. jebarlough@ucdavis.edu
Rikihisa
Y
Y
Madigan
J E
JE
D000818:Animals; D015139:Blotting, Southern; D017931:DNA Primers; D004269:DNA, Bacterial / Q000097:blood*; D004536:Ehrlichia / Q000235:genetics / Q000302:isolation & purification*; D016873:Ehrlichiosis / Q000175:diagnosis / Q000662:veterinary*; D006734:Horse Diseases; D006736:Horses; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary; D012680:Sensitivity and Specificity
D017931:DNA Primers; D004269:DNA, Bacterial