| human infection with highly pathogenic avian influenza virus (h5n1) in northern vietnam, 2004-2005. | we performed a retrospective case-series study of patients with influenza a (h5n1) admitted to the national institute of infectious and tropical diseases in hanoi, vietnam, from january 2004 through july 2005 with symptoms of acute respiratory tract infection, a history of high-risk exposure or chest radiographic findings such as pneumonia, and positive findings for a/h5 viral rna by reverse transcription-pcr. we investigated data from 29 patients (mean age 35.1 years) of whom 7 (24.1%) had died ... | 2009 | 19116044 |