SAN DIEGO, May 5, 2010 (GLOBE NEWSWIRE) -- Vical Incorporated (Nasdaq:VICL) today announced the enrollment of the first subject in its Phase 1 trial of the company’s Vaxfectin®-formulated plasmid DNA (pDNA) pandemic influenza vaccine. The trial will be conducted in collaboration with the U.S. Naval Medical Research Center (NMRC).