Authorities say three more cases of E, coli have been identified among customers of an Orange County restaurant, bringing the number of people sickened to ten.  The Orange County Health Agency says interviews with all ten people confirmed they ate at a restaurant in Lake Forest on March 23rd or 24th.  The agency says officials have not yet identified the source of the infections and the investigation is continuing.  The latest cases were confirmed a day after health officials announced that tests showed the first seven cases all had the same strain of E. coli in common, indicating a common source of infection.  Officials say one of the earlier cases, a 12-year-old girl, remains in intensive care at Children’s Hospital of Orange County.