The loss of the ability to perform two or more daily activities represents catastrophic functional decline. This can include losing the ability to get dressed, walk around, or bathe.
The six leading causes of catastrophic disability including strokes, congestive heart failure, pneumonia and influenza, ischemic heart disease, cancer and hip fracture, have all been linked to influenza illness.
Owing to the high risks older adults face from flu, prevention by getting the annual flu shot is the best strategy.