[1] Inst Adolfo Lutz Registro, Secao Bacteriol, Sao Paulo, Brazil
[2] Fundacao Oswald Cruz, Rio De Janeiro, Brazil
[3] Fundacao Nacl Saude, Sao Paulo, Brazil
[4] Inst Butantan, Sao Paulo, Brazil
[5] Org Panamericana Saude, Washington, DC USA
[6] Univ Sao Paulo, Fac Med, Sao Paulo, Brazil