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Clinical Findings in 111 Cases of Influenza A (H7N9) Virus Infection

2013; Massachusetts Medical Society; Volume: 368; Issue: 24 Linguagem: Inglês

10.1056/nejmoa1305584

1533-4406

Hainv Gao, Hongzhou Lu, Bin Cao, Bin Du, Hong Shang, Jianhe Gan, Shuihua Lu, Yida Yang, Qiang Fang, Yinzhong Shen, Xiuming Xi, Qin Gu, Xianmei Zhou, Hongping Qu, Zheng Yan, Fangming Li, Wei Zhao, Zhancheng Gao, Guangfa Wang, Ling-xiang Ruan, Weihong Wang, Jun Ye, Huifang Cao, Xingwang Li, Wenhong Zhang, Xu-Chen Fang, Jian He, Weifeng Liang, Juan Xie, Mei Zeng, Xianzheng Wu, Jun Li, Qi Xia, Zhaochen Jin, Qi Chen, Chao Tang, Zhiyong Zhang, Bao-Min Hou, Zhixian Feng, Jifang Sheng, Nanshan Zhong, Lanjuan Li,

Viral Infections and Vectors

During the spring of 2013, a novel avian-origin influenza A (H7N9) virus emerged and spread among humans in China. Data were lacking on the clinical characteristics of the infections caused by this virus.Using medical charts, we collected data on 111 patients with laboratory-confirmed avian-origin influenza A (H7N9) infection through May 10, 2013.Of the 111 patients we studied, 76.6% were admitted to an intensive care unit (ICU), and 27.0% died. The median age was 61 years, and 42.3% were 65 years of age or older; 31.5% were female. A total of 61.3% of the patients had at least one underlying medical condition. Fever and cough were the most common presenting symptoms. On admission, 108 patients (97.3%) had findings consistent with pneumonia. Bilateral ground-glass opacities and consolidation were the typical radiologic findings. Lymphocytopenia was observed in 88.3% of patients, and thrombocytopenia in 73.0%. Treatment with antiviral drugs was initiated in 108 patients (97.3%) at a median of 7 days after the onset of illness. The median times from the onset of illness and from the initiation of antiviral therapy to a negative viral test result on real-time reverse-transcriptase-polymerase-chain-reaction assay were 11 days (interquartile range, 9 to 16) and 6 days (interquartile range, 4 to 7), respectively. Multivariate analysis revealed that the presence of a coexisting medical condition was the only independent risk factor for the acute respiratory distress syndrome (ARDS) (odds ratio, 3.42; 95% confidence interval, 1.21 to 9.70; P=0.02).During the evaluation period, the novel H7N9 virus caused severe illness, including pneumonia and ARDS, with high rates of ICU admission and death. (Funded by the National Natural Science Foundation of China and others.).