Characterizing the epidemiology, virology, and clinical features of influenza in China's first severe acute respiratory infection sentinel surveillance system, February 2011-October 2013
- Peng, Z
- Feng, L
- Carolyn, GM
- Wang, K
- Zhu, G
- Zhang, Y
- Hu, J
- Huang, Y
- Pan, H
- Guo, N
- Xing, C
- Chu, Y
- Cao, Z
- Yu, D
- Liu, L
- Chen, Z
- Zeng, F
- Xu, W
- Xiong, X
- Cheng, X
- Guo, H
- Chen, W
- Li, L
- Jiang, H
- Zheng, J
- Xu, Z
- Yu, H
DOIAbstract
BACKGROUND: After the 2009 influenza A(H1N1)pdm09 pandemic, China established its first severe acute respiratory infections (SARI) sentinel surveillance system. METHODS: We analyzed data from SARI cases in 10 hospitals in 10 provinces in China from February 2011 to October 2013. RESULTS: Among 5,644 SARI cases, 330 (6%) were influenza-positive. Among these, 62% were influenza A and 38% were influenza B. Compared with influenza-negative cases, influenza-positive SARI cases had a higher median age (20.0 years vs.11.0, p=0.003) and were more likely to have at least one underlying chronic medical condition (age adjusted percent: 28% vs. 25%, p<0.001). The types/subtypes of dominant strains identified by SARI surveillance was almost always among...
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