A preliminary investigation of Ehrlichia species in ticks, humans, dogs, and capybaras from Brazil - Labruna, Marcelo Bahia; McBride, Jere W; Camargo, Luís Marcelo Aranha; Aguiar, Daniel Moura de; Yabsley, Michael J; Davidson, William R.; Stromdahl, E. Y; Williamson, P. C; Stich, R. W; Long, S. W; Camargo, Erney Felício Plessmann de; Walker, D. H (Veterinary Parasitology, 2007)