1. Institute for Experimental Animals (S.T., E.Y., H.K.), Shizuoka 431-3192, Japan;
2. Clinical Laboratory (K.U.), University of Miyazaki Hospital, Kiyotake, Miyazaki 889-1692, Japan
3. Department of Parasitology (T.S.), Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan;
4. Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine (A.O.), University of Miyazaki, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan