A number of leading drug firms have announced plans to cut prices dramatically for life-saving drugs in the developing world.<br /><br />UK-based Glaxo Smithkline, says it will slash the cost of its Rotarix vaccine by 67% - it will now cost $5 to immunise a child against rotavirus, a leading cause of diarrhoea.<br /><br />Al Jazeera spoke to Paul Cook, the head of advocacy at Tearfund.
