[1] Nagoya City Univ, Sch Med, Dept Med 2, Mizuho Ku, Nagoya, Aichi 467, Japan
[2] CHU Yaounde, Lab Hematol & Immunol, Yaounde, Cameroon
[3] Lab Natl Sante Publ, Brazzaville, Rep Congo
[4] Kyoto Univ, Inst Virus Res, Kyoto 606, Japan
[5] Natl Inst Genet, Ctr Informat Biol, Mishima, Shizuoka 411, Japan