Detection of a novel spotted fever group rickettsia in Amblyomma parvum ticks (Acari: Ixodidae) from Argentina - Pacheco, Richard de Campos; Moraes-Filho, Jonas; Nava, Santiago; Brandão, Paulo Eduardo; Richtzenhain, Leonardo José; Labruna, Marcelo Bahia (Experimental and Applied Acarology, 2007)