Though death is considerably more common in older people and those with other illnesses (such as heart disease and chronic lung disease) severe disease and some deaths occur each year in healthy young and middle aged adults and children.
Kuigi gripi tõttu surevad sagedamini eakaid ja muude haigustega (nt südamehaiguse ja kroonilise kopsuhaigusega) inimesed, esineb raskekujulist grippi ja surmajuhtumeid igal aastal ka tervete noorte ja keskealiste ning laste seas.