Chipotle Mexican Grill Inc., battered by a series of foodborne disease outbreaks, is a company stuck in marketing limbo. Efforts to emerge from its problems suffered a setback this month when the CDC disclosed five more E. coli cases in three additional states tied to Chipotle restaurants. The CDC said the latest cases involved an E. coli infection whose DNA fingerprint differed from that of the earlier cases, leading the CDC to treat the five as a separate outbreak.