Jpn. J. Infect. Dis., 65 (1), 94-97, 2012

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Masahiro Miyoshi¹*, Rika Komagome¹, Hideki Nagano¹, Kenichi Takahashi¹, Hiroshi Koba², Yumiko Kaneko², Yasuko Watanabe², Fumiaki Suzuki², Takashi Hiroshima², Ichiro Aida³, Sayaka Kitamura⁴, Naosuke Saji⁵, Ryo Yamaguchi⁵, and Motohiko Okano¹

¹Center for Infectious Diseases Control, Hokkaido Institute of Public Health, Sapporo 060-0819; ²Hokkaido Government Shiribeshi General Subprefectural Bureau, Kutchan 044-8588; ³Hokkaido Government Tokachi General Subprefectural Bureau, Obihiro 080-8588; ⁴Hokkaido Government Ishikari General Subprefectural Bureau, Sapporo 060-8558; and ⁵Department of Health and Welfare, Hokkaido Government, Sapporo 060-8558, Japan

Communicated by Makoto Takeda

(Accepted December 19, 2011)

*Corresponding author: Mailing address: Center for Infectious Diseases Control, Hokkaido Institute of Public Health, North 19 West 12, Kita-ku, Sapporo 060-0819, Japan. Tel: +81-11-747-2764, Fax: +81-11-747-2757, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.