1. Use of National Pneumonia Surveillance to Describe Influenza A(H7N9) Virus Epidemiology, China, 2004–2013
- Author
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Ying Song, Yang Cao, Marc-Alain Widdowson, Zhiheng Hong, Wenxiao Tu, Ling Meng, Zijian Feng, Jianyi Yao, Nijuan Xiang, Lei Zhou, Lianmei Jin, Qun Li, Fiona Havers, Leilei Li, Tao Chen, Kaiju Liao, Bo Liu, Yan Niu, Rui Wang, and Yanping Zhang
- Subjects
Adult ,Male ,Mainland China ,Surveillance Bias ,Microbiology (medical) ,China ,medicine.medical_specialty ,Adolescent ,Epidemiology ,Expedited ,lcsh:Medicine ,influenza A(H7N9) virus ,Influenza A Virus, H7N9 Subtype ,medicine.disease_cause ,influenza virus ,Disease Outbreaks ,lcsh:Infectious and parasitic diseases ,Young Adult ,Public health surveillance ,Influenza, Human ,Animals ,Humans ,Medicine ,Public Health Surveillance ,viruses ,lcsh:RC109-216 ,Young adult ,Child ,Aged ,business.industry ,Research ,lcsh:R ,Infant ,Pneumonia ,pneumonia surveillance ,Middle Aged ,medicine.disease ,Influenza A virus subtype H5N1 ,Infectious Diseases ,Child, Preschool ,Immunology ,Etiology ,Female ,business ,influenza ,Demography - Abstract
In mainland China, most avian influenza A(H7N9) cases in the spring of 2013 were reported through the pneumonia of unknown etiology (PUE) surveillance system. To understand the role of possible underreporting and surveillance bias in assessing the epidemiology of subtype H7N9 cases and the effect of live-poultry market closures, we examined all PUE cases reported from 2004 through May 3, 2013. Historically, the PUE system was underused, reporting was inconsistent, and PUE reporting was biased toward A(H7N9)-affected provinces, with sparse data from unaffected provinces; however, we found no evidence that the older ages of persons with A(H7N9) resulted from surveillance bias. The absolute number and the proportion of PUE cases confirmed to be A(H7N9) declined after live-poultry market closures (p
- Published
- 2013
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