Efficacy of Recombinant Influenza Vaccine in Adults 50 Years of Age or Older

New England Journal of Medicine
June 22, 2017  Vol. 376 No. 25
http://www.nejm.org/toc/nejm/medical-journal

Original Article
Efficacy of Recombinant Influenza Vaccine in Adults 50 Years of Age or Older
Lisa M. Dunkle, M.D., Ruvim Izikson, M.D., M.P.H., Peter Patriarca, M.D., Karen L. Goldenthal, M.D., Derek Muse, M.D., Janice Callahan, Ph.D., and Manon M.J. Cox, Ph.D., for the PSC12 Study Team*
N Engl J Med 2017; 376:2427-2436
June 22, 2017
DOI: 10.1056/NEJMoa1608862
Improved influenza vaccines are needed to control seasonal epidemics. This trial compared the protective efficacy in older adults of a quadrivalent, recombinant influenza vaccine (RIV4) with a standard-dose, egg-grown, quadrivalent, inactivated influenza vaccine (IIV4) during the A/H3N2-predominant 2014–2015 influenza season, when antigenic mismatch between circulating and vaccine influenza strains resulted in the reduced effectiveness of many licensed vaccines.