Abstract
Shiraoka Chuo Sogo Hospital, Shiraoka, Saitama 329-0217, *Department of Infectious Diseases and Tropical Medicine, Research Institute International Medical Center of Japan, Shinjuku, Tokyo 162-8655, †Central Research Laboratory, Akita University School of Medicine, Akita 010-8543, ‡Department of Microbiology and Department of Intensive and Critical Care Medicine, Jichi Medical School, minamikawachi-machi, Tochigi 329-0498, Japan
Corresponding author: Dr T. Kirikae (e-mail: tkirikae{at}ri.imcj.go.jp ).