title: Development of resistance to nymphs of Amblyomma cajennense ticks (Acari:Ixodidae) in dogs.
abstract: Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, 14.884-900 Jaboticabal, SP, Brasil.
authors.forename: Luciana S
authors.initials: LS
authors.lastname: Mukai
authors.forename: A Castro
authors.initials: AC
authors.lastname: Netto
authors.forename: M P J
authors.initials: MP
authors.lastname: Szabo
authors.forename: G H
authors.initials: GH
authors.lastname: Bechara
mesh_terms: D000818:Animals; D001096:Arachnid Vectors / Q000276:immunology; D004283:Dog Diseases / Q000276:immunology* / Q000469:parasitology; D004285:Dogs; D006790:Host-Parasite Interactions; D007113:Immunity, Innate; D026863:Ixodidae / Q000254:growth & development / Q000276:immunology* / Q000502:physiology; D018978:Molting; D009758:Nymph / Q000254:growth & development / Q000276:immunology / Q000502:physiology; D013984:Tick Infestations / Q000276:immunology / Q000662:veterinary*