Ticks of the State of Rondônia, Western Brazilian Amazon: detection of Borrelia sp., Ehrlichia sp. and Rickettsia sp. by the use of polymerase chain reaction and southern blotting - Gehrke, F. S; Labruna, Marcelo Bahia; Camargo, Luís Marcelo Aranha; Camargo, Erney Felício Plessmann de; Schumaker, Teresinha Tizu Sato (International Congress of Acarology, 2002)