Health officials are continuing to investigate as cases of cyclosporiasis spread across the U.S. But what exactly goes into investigating a foodborne outbreak?
The CDC expanded the outbreak of cyclosporiasis linked to shredded iceberg lettuce to an additional four states, a CDC official told ABC News on Friday.
There may be other potential sources behind the outbreak.
North Carolina health officials confirm hundreds of new cases of cyclosporiasis in the past week as investigators continue searching for the source of the outbreak.