A two-step flu vaccine using DNA to "prime" the immune system

http://www.reuters.com/article/idUSTRE66E7BM20100715
WASHINGTON | Thu Jul 15, 2010 7:20pm EDT

WASHINGTON (Reuters) - A two-step flu vaccine using DNA to "prime" the immune system and then a traditional seasonal influenza vaccine may be able to protect against all strains of the virus -- providing a long-sought "universal" flu vaccine, U.S. researchers said on Thursday.