A new aggressive form of HIV can progress to AIDS in just three years - so rapidly that patients may not even realise they were infected, scientists say. Engaging in unprotected sex with multiple partners increases the risk of contracting multiple strains of HIV. Once inside a host, these strains can recombine into a new variant of the virus, researchers said.
Scientists have successfully developed healthy cartilage from embryonic stem cells, a breakthrough that could help treat arthritis patients.





