Chipotle's troubles might help Panera as both serve up reports

By Noel Randewich SAN FRANCISCO (Reuters) - Wall Street expects little from Chipotle Mexican Grill Inc's first-quarter results late on Tuesday as the burrito chain struggles to recover from a string of food-borne illness outbreaks. Shares of Chipotle have dropped 38 percent since August after norovirus and E.coli outbreaks at some of its outlets led to a plunge in sales for the company, which markets its food as healthier than rivals'. At least some customers steering clear of Chipotle appear to