Rickettsia species infecting Amblyomma cooperi ticks from an area in the state of São Paulo, Brazil, where brazilian spotted fever is endemic - Labruna, Marcelo Bahia; Whitworth, Ted; Horta, Maurício C.; Bouyer, Donald H.; McBride, Jere W.; Pinter, Adriano; Popov, Vsevolod; Gennari, Solange Maria; Walker, David H. (Journal of Clinical Microbiology, 2004)