[1] Adolfo Lutz Inst, Parasitol Lab, BR-01246902 Sao Paulo, Brazil
[2] Inst Infectol Emilio Ribas, Dept Neurol, BR-05411000 Sao Paulo, Brazil
[3] Univ Sao Paulo, Div Molestias Infecciosas & Parasitarias, Serv Extensao Ao Atendimento Pacientes HIV AIDS, Fac Med,Hosp Clin, Sao Paulo, Brazil
[4] Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA