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. 2013 Aug;19(8):1289-92.
doi: 10.3201/eid1908.130662.

Monitoring avian influenza A(H7N9) virus through national influenza-like illness surveillance, China

Cuiling Xu  1 , Fiona Havers, Lijie Wang, Tao Chen, Jinghong Shi, Dayan Wang, Jing Yang, Lei Yang, Marc-Alain Widdowson, Yuelong Shu
Affiliations

Monitoring avian influenza A(H7N9) virus through national influenza-like illness surveillance, China

Cuiling Xu et al. Emerg Infect Dis. 2013 Aug.

Abstract

In China during March 4-April 28, 2013, avian influenza A(H7N9) virus testing was performed on 20,739 specimens from patients with influenza-like illness in 10 provinces with confirmed human cases: 6 (0.03%) were positive, and increased numbers of unsubtypeable influenza-positive specimens were not seen. Careful monitoring and rapid characterization of influenza A(H7N9) and other influenza viruses remain critical.

Keywords: China; H7N9; avian influenza; avian influenza A(H7N9) virus; influenza; influenza-like illness; subtype H7N9; surveillance; viruses.

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Figures

Figure 1
Figure 1
Geographic distribution of national influenza surveillance sentinel hospitals in Beijing and Shanghai Municipalities and 8 provinces with confirmed human cases of avian influenza A(H7N9) virus infection, China, 2013.
Figure 2
Figure 2
Percentage of hospital visits attributed to influenza-like illness, China, April 2, 2012–May 6, 2013. Hospital visits were made to sentinel surveillance hospitals in 7 southern provinces (SP) and 3 northern provinces/municipalities (NM, NP) with confirmed human cases of avian influenza A(H7N9) virus infection. Arrows indicate March 31, 2013, the date the first human case of influenza A(H7N9) virus infection was reported.
See this image and copyright information in PMC

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