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Volume 10, Number 10, October 2004

Geographic and Temporal Trends in Influenzalike Illness, Japan, 1992–1999

Takatsugu Sakai,* Hiroshi Suzuki,* Asami Sasaki,* Reiko Saito,* Naohito Tanabe,* and Kiyosu Taniguchi†
*Niigata University School of Medicine, Niigata, Japan; and †National Institute of Infectious Disease, Tokyo, Japan

 
 
Figure 2.
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Figure 2. Timing of peak influenzalike illness epidemic activity by week in Japan. The isobars on the contour maps represent interpolated time of peak activity distributed spatially at 1-week intervals. The first week was defined when the peak week was observed first in any one of the prefectures in each season, and then the following weeks were numbered.

 

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This page last reviewed September 13, 2004

Emerging Infectious Diseases Journal
National Center for Infectious Diseases
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