Prevalence of Ehrlichia canis (Rickettsiales: Anaplasmataceae) in dogs and Rhipicephalus sanguineus (Acari: Ixodidae) ticks from Brazil - Aguiar, Daniel Moura de; Cavalcante, Guacyara Tenório; Pinter, Adriano; Gennari, Solange Maria; Camargo, Luís Marcelo Aranha; Labruna, Marcelo Bahia (Journal of Medical Entomology, 2007)