- Centers for Disease Control and Prevention said Friday trying to determine whether romaine lettuce is the source of E. coli outbreak.
- The outbreak has sickened at least 37 people, with one isolated report in Indiana.
- CDC also trying to determine whether romaine used at Wendy’s also served or sold at other businesses.
- Agency says no evidence romaine sold in grocery stores linked to outbreak.
- Wendy’s says lettuce used in its salads different.
