A popular Portland restaurant has been investigated for the second time in 18 months as a possible source of food borne illness. The Portland Press Herald reports, that health officials visited Petite Jacqueline after a food handler and customer were sickened by the same bacterial illness June 1. But officials said too much time has passed to determine if the French bistro’s food caused the problems. Restaurant general manager and co-owner Liz Koenigsberg told the paper that the restaurant is cooperating with authorities and its food-handling practices are safe. But state health inspector Michael Russell said he observed some “risk factors” there. The two people sickened in the latest incident tested positive for campylobacter, a bacteria that was also found after a January 2012 complaint at the restaurant.