403721 02: (UNDATED FILE PHOTO) A variety of bacterial cultures grow in petri dishes at pharmaceutical company Aventis Pasteur in this undated file photo. Aventis Pasteur announced March 29, 2002 that it would donate 75-90 million doses of smallpox vaccine it had manufactured 30 years ago to the U.S. federal government. The frozen stockpile had accumulated after the U.S. quit giving inoculations in 1972. (Photo by Aventis Pasteur MSD/Getty Images)
