We compared influenza vaccine-prevented hospitalizations in adults aged ≥65 years for a range of hypothetical effectiveness estimates. During 2012-2013, a vaccine with 10% effectiveness (66% coverage) would have averted approximately 13 000 hospitalizations, and a vaccine with 40% effectiveness would have averted approximately 60 000 hospitalizations. Annual vaccination is merited in this vulnerable population.
Fry AM, Kim IK, Reed C, Thompson M, Chaves SS, Finelli L, Bresee J. (2014). Modeling the effect of different vaccine effectiveness estimates on the number of vaccine-prevented influenza-associated hospitalizations in older adults. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 59(3)