WHO warns swine flu 'unstoppable' The UN's top health official tells a swine flu forum in Mexico that the spread of the virus worldwide is now unstoppable. Solo life ups gene dementia risk People who have a gene flaw and live alone in middle-age are at highest risk of developing dementia, a study suggests. Flu risk for indigenous peoples Indigenous peoples, such as Aborigines and Native Americans, have a higher risk from swine flu, experts warn. Four pints 'increase health risk' Men who drink four pints of beer a week could be increasing their lifetime risk of needing hospital treatment, a study says. Warning over fake Tamiflu sales People should not buy anti-flu drug Tamiflu over the internet without a prescription, experts warn. Gene clues to schizophrenia risk Scientists identify thousands of tiny genetic variations which raise the risk of schizophrenia. India media hails gay sex ruling The Indian media hails a ruling by a court ruling decriminalising homosexuality in the country