A 10 years study published early this week by NEJM.
Elderly who get the flu shot are:
27 per cent less likely to be hospitalized with flu or pneumonia
48 per cent less likely to die from flu-related complications.
"Effectiveness of Influenza Vaccine in the Community-Dwelling Elderly."
Nichol, Kristin L., Nordin, James D., Nelson, David B., Mullooly, John P., Hak, Eelko N Engl J Med 2007 357: 1373-1381
Volume 357:1373-1381, October 4, 2007, Number 14