RESUMEN
Objective To understand the epidemiology and clinical features of avian influenza,improve the prophylaxis and treatment.Methods Clinical data of a fatal case caused by H7N9 avian influenza A virus in Shanghai was retrospectively reported and analyzed,literature on avian influenza A virus infection in human was reviewed.Results A severe case of H7N9 avian influenza was reported,with typical clinical characteristics.The epidemiology history of the patient was unclear,all the contacts were tested negative for H7N9 avian influenza A virus.Literature search,H7 subtype of avian influenza in 2012 was only sporadic,the majority of patients with mild symptoms.People did not have immunity against avian influenza.Conclusions Severe case of H7N9 avian influenza progress quickly and its infection pattern is not clear up-to the time point.It needs further exploration and discovery.