It is unclear whether pandemic 2009 influenza A (pH1N1) infection caused more significant disease among hospitalized adults than seasonal influenza.A prospective, observational study was conducted in adults hospitalized with polymerase chain reaction-confirmed pH1N1 infection in 2 acute-care general hospitals from June 2009 to May 2010 (n = 382). Complications and outcomes were described and compared with those in a seasonal influenza cohort (2007-2008, same hospitals; n = 754).Hospitalized patients with pH1N1 influenza were younger than those with seasonal influenza (mean age ± standard deviation, 47 ± 20 vs 70 ± 19 years) and fewer had comorbid conditions (48

作者：Nelson, Lee；Paul K S, Chan；Grace C Y, Lui；Bonnie C K, Wong；Winnie W Y, Sin；Kin-Wing, Choi；Rity Y K, Wong；Elaine L Y, Lee；Apple C M, Yeung；Karry L K, Ngai；Martin C W, Chan；Raymond W M, Lai；Alex W Y, Yu；David S C, Hui

来源：The Journal of infectious diseases 2011 年 203卷 12期