Ripley Ballou poses at the GlaxoSmithKline company offices i

BELGIUM - DECEMBER 14: Ripley Ballou poses at the GlaxoSmithKline company offices in Rixensart, Belgium, on Tuesday, Dec. 18, 2007. Ballou, 56, was a U.S. Army colonel at Walter Reed Army Institute of Research in Washington in 1996 when the vaccine, called Mosquirix, was tested in seven volunteers who were bitten by malaria-infected mosquitoes. The shot protected six of them. (Photo by Paul O'Driscoll/Bloomberg via Getty Images)