Yu H, Cowling BJ, Feng L, Lau EH, Liao Q, Tsang TK, et al. Lancet. 2013 Jul 13;382(9887):138-45.
Background
Characterisation of the severity profile of human infections with influenza viruses of animal origin is a part of pandemic risk assessment, and an important part of the assessment of disease epidemiology. Our objective was to assess the clinical severity of human infections with avian influenza A H7N9 virus, which emerged in China in early 2013.