New smallpox vaccine delivered to U.S. national stockpile

According to the Centers for Disease Control and Prevention (CDC), the last case of smallpox in the United States was in 1949, and the last naturally occurring case in the world was in Somalia in 1977; the virus still exists in laboratory stockpiles, however, and after the terrorist attacks on 9/11, "there is heightened concern that the variola virus might be used as an agent of bioterrorism," the CDC says