Treating people with HIV who have uninfected partners significantly reduces transmission rates, researchers in China have found.

Anti-smoking campaigners celebrate as Australia becomes the first country in the world to introduce plain packaging for cigarettes.

Doctors have warned of a "lack of knowledge" about the dangers of mixing some medications with grapefruit.

Care home companies would have to open up their books to inspectors to ensure they were financially sound, under government plans for new regulation.

There is still too much ignorance about HIV and Aids, David Cameron says, as figures suggest 25,000 people in the UK have the virus but do not know.

Around 25,000 people in the UK are thought to be unaware that they are infected with HIV, according to new figures.