Narrator: This is Science Today. The concept of how one disease can prevent the onset of another is not new. In 1798, for example, cowpox was used to prevent smallpox. Dr. E. Richard Stiehm, a professor of pediatrics at UCLA, has put together a paper chronicling examples throughout medical history of ways that one disease prevents another.
Stiehm: Many great advances in medicine are based on good clinical observations and these clinical observations have to be followed up by rigorous, scientific studies.
Narrator: For example, Stiehm says there have been several studies indicating that HIV patients co-infected with a virus related to Hepatitis C, called GB virus C, have less severe HIV disease and improved survival.
Stiehm: Maybe we have to look at a new way to battle HIV and I think that using certain viruses may be the answer rather than trying to develop antibodies, which doesn't work.
Narrator: For Science Today, I'm Larissa Branin.