A study of a smallpox vaccine that could prove vital in the United States' war on bioterrorism is under way at Stanford Medical Center. The trial tests the potency of the Dryvax vaccine, a 1970s-era ...

Smallpox was a severe infectious disease that affected humans for thousands of years before its eradication in the late 20th century. The symptoms included a distinctive rash, pustules, and fever.

Health experts see his retreat from international cooperation as disrupting the safe-keepers of one of the world’s deadliest pathogens. By William J. Broad In 1999, William J. Broad and two colleagues ...