Prevalence of Rickettsia infection in dogs from the urban and rural areas of Monte Negro Municipality, Western Amazon, Brazil - Labruna, Marcelo Bahia; Horta, Maurício Cláudio; Aguiar, Daniel Moura de; Cavalcante, Guacyara T.; Pinter, Adriano; Gennari, Solange Maria; Camargo, Luís Marcelo Aranha (Vector-Borne and Zoonotic Diseases, 2007)