[1] Hosp Nacl Cayetano Heredia, Dept Enfermedades Infecciosas Trop & Dermatol, Lima, Peru
[2] Univ Peruana Cayetano Heredia, Inst Med Trop Alexander von Humboldt, Lima, Peru
[3] Inst Trop Med, Dept Microbiol, HIV & Retrovirol Res Unit, B-2000 Antwerp, Belgium