The U.S. government is cautiously optimistic that the so-called swine flu virus is less virulent that was originally believed, U.S. Health Secretary Kathleen Sebelius said on Tuesday. “There has been aggressive action and appropriate action to get out ahead of what was a brand new viral strain,” she said. “We will continue to accelerate the work on vaccine manufacturing.” “We are cautiously optimistic that what we are seeing right now is presenting itself as a much milder virus than the initial cases ... in Mexico,” Sebelius added.
