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Volume 20, Number 9—September 2014
Dispatch

Asymptomatic, Mild, and Severe Influenza A(H7N9) Virus Infection in Humans, Guangzhou, China

Zongqiu Chen1, Hui Liu1, Jianyun Lu1, Lei Luo1, Kuibiao Li, Yufei Liu, Eric H.Y. Lau, Biao Di, Hui Wang, Zhicong Yang2, and Xincai Xiao2Comments to Author 
Author affiliations: Guangzhou Center for Disease Control and Prevention, Guangzhou, China (Z. Chen, H. Liu, J. Lu, L. Luo, K. Li, Y. Liu, B. Di, H. Wang, Z. Yang, and X. Xiao); University of Hong Kong, Hong Kong, China (E.H.Y. Lau)

Main Article

Table 1

Investigation of weekly reported number of patients with pneumonia, PUE, and ILI and confirmed cases of influenza A(H7N9) virus infection, Guangzhou, China, April 1, 2013–March 7, 2014*

Year, wk PUE surveillance
 ILI surveillance
No. patients with pneumonia No. (%) patients with PUE No. confirmed influenza A(H7N9) infections No. patients with ILI No. (%) samples tested No. confirmed influenza A(H7N9) infections
2013
14 951 22 (2.3) 0 8,089 47 (0.6) 0
15 996 28 (2.8) 0 8,555 65 (0.8) 0
16 1,021 36 (3.5) 0 8,698 55 (0.6) 0
17 1,087 44 (4.1) 0 8,759 63 (0.7) 0
18 1,118 48 (4.3) 0 9,852 43 (0.4) 0
19 1,146 62 (5.4) 0 8,682 68 (0.8) 0
20 1,238 65 (5.4) 0 9,621 55 (0.6) 0
21 1,197 55 (4.6) 0 10,248 64 (0.6) 0
22 1,121 48 (4.3) 0 11,264 83 (0.7) 0
23 1,166 41 (3.5) 0 9,546 82 (0.9) 0
24 1,041 37 (3.6) 0 9,962 81 (0.8) 0
25 1,075 42 (3.9) 0 8,910 96 (1.1) 0
26 1,032 35 (3.4) 0 7,735 68 (0.9) 0
27 976 31 (3.2) 0 7,431 80 (1.1) 0
28 922 28 (3.0) 0 7,567 83 (1.1) 0
29 945 26 (2.8) 0 7,306 80 (1.1) 0
30 908 28 (3.1) 0 6,998 82 (1.2) 0
31 887 20 (2.3) 0 7,824 76 (1.0) 0
32 911 17 (1.9) 0 7,484 74 (1.0) 0
33 848 19 (2.2) 0 7,176 82 (1.1) 0
34 925 11 (1.2) 0 8,018 85 (1.1) 0
35 883 16 (1.8) 0 8,186 84 (1.0) 0
36 856 11 (1.3) 0 8,768 85 (1.0) 0
37 833 13 (1.6) 0 9,549 86 (0.9) 0
38 821 12 (1.5) 0 8,788 82 (0.9) 0
39 773 14 (1.8) 0 7,217 73 (1.0) 0
40 844 17 (2.0) 0 6,448 68 (1.1) 0
41 755 12 (1.6) 0 5,513 63 (1.1) 0
42 721 10 (1.4) 0 5,284 79 (1.5) 0
43 733 16 (2.2) 0 5,746 73 (1.3) 0
44 766 18 (2.4) 0 6,599 70 (1.1) 0
45 803 26 (3.2) 0 5,655 75 (1.3) 0
46 846 28 (3.3) 0 4,234 83 (2.0) 0
47 815 42 (5.2) 0 5,054 82 (1.6) 0
48 859 40 (4.7) 0 4,683 95 (2.0) 0
49 935 46 (4.9) 0 5,493 101 (1.8) 0
50 947 51 (5.4) 0 5,488 112 (2.0) 0
51 1,004 43 (4.3) 0 4,151 117 (2.8) 0
52
 1,066
 52 (4.9)
 0
4,840
 119 (2.5)
 0
2014
01 1,124 62 (5.5) 0 6,497 113 (1.7) 0
02 1,091 70 (6.4) 1 7,313 121 (1.7) 0
03 1,198 79 (6.6) 3 6,401 126 (2.0) 0
04 1,257 91 (7.2) 0 6,089 118 (1.9) 0
05 1,286 86 (6.7) 1 6,048 105 (1.7) 1
06 845 32 (3.8) 1 4,656 68 (1.5) 1
07 1,036 86 (8.3) 5 4,172 98 (2.4) 1
08 1,122 70 (6.2) 4 4,340 113 (2.6) 0
09 1,123 77 (6.9) 1 6,850 111 (1.6) 0
10 1,084 63 (5.8) 1 5,925 117 (2.0) 0
Total 47,934 1923 (4.0) 16 349,712 4,149 (1.2) 3

*Real-time reverse transcription PCR testing for influenza A(H7N9) virus was implemented in April 1, 2013 (2013 week 14). Samples were collected from all patients with PUE and were laboratory tested. PUE, pneumonia of unknown etiology; ILI, influenza-like illness.

Main Article

1These first authors contributed equally to this article.

2These senior authors contributed equally to this article.

Page created: August 14, 2014
Page updated: August 14, 2014
Page reviewed: August 14, 2014
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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