Invited to China in 1977 to talk about his great discovery, a virus that caused hepatitis, and his greater invention, a vaccine to prevent it, he would slip out in the early mornings to run for hours through fields, farmyards or the just-stirring streets of Beijing.

ECONOMIST: Barry Blumberg

Cohen took the malaria surface protein used in Ballou's vaccine and fused it to a protein from the hepatitis B virus, creating a harmless particle that looked like a virus to the immune system.

FORBES: Magazine Article