- 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 50 Years or Older. The Journal of infectious diseases. 2014 Oct 21. PMID: 25336724 [PubMed].
There are few estimates of influenza vaccine effectiveness in preventing serious outcomes in older adults.