Jpn. J. Infect. Dis., 65 (5), 450-454, 2012

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Hiroshi Yoshikura*

National Institute of Infectious Diseases, Tokyo 162-8640, Japan

Communicated by Ichiro Kurane

(Accepted July 2, 2012)

*Corresponding author: Mailing address: Department of Food Safety, Ministry of Health, Labour and Welfare, 1-2-2, Kasumigaseki, Chiyoda-ku, Tokyo 100-8916, Japan. Tel: +81-3-3595-2326, Fax: +81-3-3503-7965, E-mail: このメールアドレスはスパムボットから保護されています。閲覧するにはJavaScriptを有効にする必要があります。