Comparing estimates of influenza-associated hospitalization and death among adults with congestive heart failure based on how influenza season is defined

BackgroundThere is little consensus about how the influenza season should be defined in studies that assess influenza-attributable risk. The objective of this study was to compare estimates of influenza-associated risk in a defined clinical population using four different methods of defining the influenza season.MethodsUsing the Studies of Left Ventricular Dysfunction (SOLVD) clinical database and national influenza surveillance data from …