[1] Asahikawa Med Coll, Dept Parasitol, Asahikawa, Hokkaido 078, Japan
[2] Univ Indonesia, Fac Med, Dept Parasitol, Jakarta, Indonesia
[3] Univ Indonesia, Fac Med, Dept Neurol, Jakarta, Indonesia
[4] Asahikawa Med Coll, Anim Lab Med Res, Asahikawa, Hokkaido 078, Japan
[5] Tottori Univ, Fac Agr, Sch Vet Med, Dept Lab Anim Sci, Tottori 680, Japan
[6] Minist Hlth, Directorate Gen Communicable Dis Control & Enviri, Jakarta, Indonesia
[7] Cent Inst Expt Anim, Kawasaki, Kanagawa, Japan
[8] Univ Salford, Div Biol Sci, Sch Environm & Life Sci, Salford M5 4WT, Lancs, England