title: Attempted transmission of Ehrlichia risticii, causative agent of Potomac horse fever, by the ticks, Dermacentor variabilis, Rhipicephalus sanguineus, Ixodes scapularis and Amblyomma americanum.
abstract: Dermacentor variabilis, Rhipicephalus sanguineus, Amblyomma americanum, and Ixodes scapularis ticks were investigated for their ability to transmit Potomac horse fever. Larval and nymphal ticks were exposed to Ehrlichia risticii by feeding on mice inoculated with the organism. Molted exposed ticks were then allowed to feed on susceptible ponies or mice. No evidence of transmission, either clinically or by detection of antibodies to E. risticii in mice or ponies, was observed for any tick species examined.
authors.affiliation: Virginia-Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg 24061.
authors.forename: N E
authors.initials: NE
authors.lastname: Hahn
authors.forename: M
authors.initials: M
authors.lastname: Fletcher
authors.forename: R M
authors.initials: RM
authors.lastname: Rice
authors.forename: K M
authors.initials: KM
authors.lastname: Kocan
authors.forename: J W
authors.initials: JW
authors.lastname: Hansen
authors.forename: J A
authors.initials: JA
authors.lastname: Hair
authors.forename: R W
authors.initials: RW
authors.lastname: Barker
authors.forename: B D
authors.initials: BD
authors.lastname: Perry
mesh_terms: D000818:Animals; D001096:Arachnid Vectors / Q000382:microbiology*; D003870:Dermacentor / Q000382:microbiology; D004536:Ehrlichia / Q000302:isolation & purification*; D006734:Horse Diseases / Q000635:transmission*; D006736:Horses; D007814:Larva / Q000382:microbiology; D051379:Mice; D009758:Nymph / Q000382:microbiology; D012287:Rickettsiaceae / Q000302:isolation & purification*; D012288:Rickettsiaceae Infections / Q000635:transmission / Q000662:veterinary*; D013987:Ticks / Q000382:microbiology*