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.
US researchers have successfully used a dog to sniff out thyroid cancer in people who had not yet been diagnosed. The trained scent dog accurately identified whether patients' urine samples had thyroid cancer or were benign (noncancerous) 88.2 per cent of the time, researchers said.