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 3. Correlation analysis among three parameters. Greatest number of cases refers to the greatest number of reported influenzalike illness (ILI) cases per sentinel per week (RC/S/W) in each prefecture in each season. The increasing-to-peak period refers to the period from the week when the number of RC/S/W reached >50% of the peak to the peak week. The means of the above two parameters were calculated by season and used for analysis. The nationwide peak-duration refers to the time between the first and last peak week observed among 46 prefectures.

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This page last reviewed September 13, 2004

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