Chipotle Mexican Grill Inc said it would reopen all 43 outlets in the Seattle and Portland areas that it closed after E. coli food poisoning sickened some people who had eaten at eight Chipotle restaurants in those areas. Health officials have concluded that there is no ongoing risk from this incident, Chipotle said on Tuesday. All of Chipotle’s 43 outlets in those areas have been closed since Oct. 31.