[Source: Clinical Infectious Diseases, full text: (LINK). Extract, edited.]
Epidemiologic Characteristics of Cases for Influenza A(H7N9) Virus Infections in China
Wenyi Zhang 1,a, Liya Wang 1,a, Wenbiao Hu 2,a, Fan Ding 3,a, Hailong Sun 1, Shenlong Li 1, Liuyu Huang 1, and Chengyi Li 1
Author Affiliations: 1Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, China 2School of Population Health, Infectious Disease Epidemiology Unit, University of Queensland, Brisbane, Australia 3Chinese Center for Disease Control and Prevention, Beijing, China
Correspondence: Chengyi Li, Institute of Disease Control and Prevention, 20 Dong-Da Street, Fengtai District, Beijing 100071, People's Republic of China (firstname.lastname@example.org).
To the Editor —
China's National Health and Family Planning Commission announced 3 deaths caused by avian-origin influenza A(H7N9) virus in March, which was the first time that the H7N9 strain has been found in humans . This is of major public health significance and raises urgent questions and global concerns [2, 3]. To explore epidemic characteristics of human infections with H7N9 virus, data on individual cases from 19 February 2013 (onset date of first case) to 14 April 2013 were collected from the China Information System for Disease Control and Prevention, which included information about sex; age; occupation; residential address; and day of symptom onset, diagnosis, and outcome for each case. The definition of an unconfirmed probable H7N9 case is a patient with epidemiologic evidence of contact …