403111 04: Twenty-Three-Year-Old Ali Maow Maalin, The Last Known Person In The World With Smallpox, Is Shown In This Undated Photo In Merka, Somalia. Drug Company Aventis Pasteur Announced March 29, 2002 That It Would Donate To The Government 75-90 Million Doses Of A Smallpox Vaccine It Has Been Keeping In Cold Storage For Decades. The Vaccinia Virus Is Normally Confined To Cattle, But Is Conveyed To Humans Through Vaccination, Imparting Immunity To The Smallpox Virus. (Photo By Getty Images)