HIV is known as the virus that causes AIDS. But in rare cases, a person infected with HIV does not become sick. Scientists have been studying these so-called "elite controllers" to better understand how they avoid AIDS. Researchers have unraveled part of the puzzle.
Treating Parkinson's disease with gene therapy has been shown to be successful in clinical trials for the first time, say US researchers. The illness causes uncontrolled shaking, stiffness and slow movement as part of the brain dies.
The small study in The Lancet Neurology used a virus to add genes to brain cells, which resulted in reduced symptoms for half of patients.
