Behind China's HIV crisis

More than 500,000 people in central China are believed to have been infected with the Aids virus in what is being called a "blood for sale" scandal. Peasants sell their blood to profiteering local health officials who then resell it to pharmaceutical companies. With many blood clinics unhygienic and ill-equipped, HIV infection in parts of Henan province is now 65 per cent. The BBC's Adam Brookes reports.