Influenza vaccine prevents medically attended influenza-associated acute respiratory illness in adults aged ≥50 years.

Chen Q, Griffin MR, Nian H, Zhu Y, Williams JV, Edwards KM, Talbot HK. Influenza vaccine prevents medically attended influenza-associated acute respiratory illness in adults aged ≥50 years. The Journal of infectious diseases. 2015 Apr 1;211(7). 1045-50. PMID: 25336724 [PubMed].

There are few estimates of effectiveness influenza vaccine in preventing serious outcomes due to influenza in older adults.