WASHINGTON, May 13 (Reuters) - New Centers for Disease Control guidance could add strength to the U.S. economic rebound by building confidence it is safe to resume normal commerce, St. Louis Federal Reserve President James Bullard said on Thursday. “That sounds like a recipe for very strong growth,” Bullard said of new CDC guidance that those vaccinated against COVID-19 did not have to wear masks or socially distance indoors or outdoors in most circumstances. Reporting by Howard Schneider Editing by Chris Reese Our Standards: The Thomson Reuters Trust Principles.