RT Journal Article SR Electronic T1 2008–2009 Influenza update: A better vaccine match JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 865 OP 870 DO 10.3949/ccjm.75a.08088 VO 75 IS 12 A1 Mossad, Sherif B. YR 2008 UL http://www.ccjm.org/content/75/12/865.abstract AB Last year, the influenza vaccine did not match the circulating strains very well, and its overall protective efficacy was only 40%. All three antigens contained in the 2008-2009 vaccine are new. Surveillance data from the Southern Hemisphere during the summer of 2008 show that this vaccine is expected to match well the circulating strains in the Northern Hemisphere.