Jpn. J. Infect. Dis., 65 (4), 354-358, 2012
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Hiroshi Yoshikura*
National Institute of Infectious Diseases, Tokyo 162-8640, Japan
Communicated by Ichiro Kurane
(Accepted April 23, 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, Email: This email address is being protected from spambots. You need JavaScript enabled to view it.