[Clinical features of adults younger and older than 50 years hospitalized with influenza A H1N1 2009 in a private hospital in Santiago, Chile].

Introduction: The new pandemic influenza A H1N1 2009 virus has shown a different clinical behavior in different age groups.

Objective: To describe the clinical features of adult patients hospitalized with influenza AH1N1 2009 and compare the clinical and demographic variables among adults < 50 years and over 50 years old.

Patients And Method: We included hospitalized patients between May 17 and July 17, 2009 confirmed by polymerase chain reaction (PCR) and/or rapid test for influenza A.