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Volume 15, Number 10—October 2009

Research

Review of an Influenza Surveillance System, Beijing, People’s Republic of China

Peng Yang, Wei Duan, Min Lv, Weixian Shi, Xiaoming Peng, Xiaomei Wang, Yanning Lu, Huijie Liang, Holly Seale, Xinghuo Pang, and Quanyi WangComments to Author 
Author affiliations: Beijing Center for Disease Prevention and Control, Beijing, People’s Republic of China (P. Yang, W. Duan, M. Lv, W. Shi, X. Peng, X. Wang, Y. Lu, H. Liang, X. Pang, Q. Wang); University of New South Wales, Sydney, New South Wales, Australia (H. Seale)

Main Article

Table 2

Onset of influenza epidemic as determined by the various ILI data during the 2007–08 influenza season, Beijing, People’s Republic of China*

Data ILI rate
ILI count
Warnings meeting the standard Onset week Warnings meeting the standard Onset week
Hospital level
1 C1 in a given week and the greater following value 51 C1 in a given week and the greater following value 51
2 Consecutive 2 C2 51 Consecutive 2 C2 49†
3
C1 in a given week and the greater following value
51

Consecutive 3 C3
49†
Age group, y
0–4 NA NA Consecutive 3 C3 48
5–14 NA NA Consecutive 2 C2 46
15–24 NA NA C1 in a given week and the greater following value 49†
25–59 NA NA C1 in a given week and the greater following value 49†
>60 NA NA C1 in a given week and the greater following value 51

*ILI, influenza-like illness; C1, C1-mild algorithm; C2, C2-medium algorithm; C3, C3-ultra algorithm; NA, not available.
†Onset week, determined by the accepted standard based on 40% of the maximum weekly isolation rate, is the threshold

Main Article

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