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- Title
Human Infection with Influenza A(H7N9) Virus during 3 Major Epidemic Waves, China, 2013-2015.
- Authors
Peng Wu; Zhibin Peng; Fang, Vicky J.; Luzhao Feng; Tsang, Tim K.; Hui Jiang; Lau, Eric H. Y.; Juan Yang; Jiandong Zheng; Ying Qin; Zhongjie Li; Leung, Gabriel M.; Hongjie Yu; Cowling, Benjamin J.; Wu, Peng; Peng, Zhibin; Feng, Luzhao; Jiang, Hui; Yang, Juan; Zheng, Jiandong
- Abstract
Since March 2013, a novel influenza A(H7N9) virus has caused 3 epidemic waves of human infection in mainland China. We analyzed data from patients with laboratory-confirmed influenza A(H7N9) virus infection to estimate the risks for severe outcomes after hospitalization across the 3 waves. We found that hospitalized patients with confirmed infections in waves 2 and 3 were younger and more likely to be residing in small cities and rural areas than were patients in wave 1; they also had a higher risk for death, after adjustment for age and underlying medical conditions. Risk for death among hospitalized patients during waves 2 and 3 was lower in Jiangxi and Fujian Provinces than in eastern and southern provinces. The variation in risk for death among hospitalized case-patients in different areas across 3 epidemic waves might be associated with differences in case ascertainment, changes in clinical management, or virus genetic diversity.
- Subjects
CHINA; AVIAN influenza epidemiology; H7N9 Influenza; EPIDEMIOLOGY; ARTIFICIAL respiration; AVIAN influenza treatment; PUBLIC health; INFECTIOUS disease transmission; INFLUENZA transmission; INFLUENZA epidemiology; ANIMAL experimentation; COMPARATIVE studies; EPIDEMICS; HISTORY; HOSPITAL care; INFLUENZA; RESEARCH methodology; MEDICAL cooperation; MORTALITY; PUBLIC health surveillance; RESEARCH; RESEARCH funding; EVALUATION research; INFLUENZA A virus; GENOTYPES
- Publication
Emerging Infectious Diseases, 2016, Vol 22, Issue 6, p964
- ISSN
1080-6040
- Publication type
journal article
- DOI
10.3201/eid2206.151752