As cyclosporiasis spreads across US, what goes into a disease outbreak investigation?

Health officials are continuing to investigate as cases of cyclosporiasis spread across the U.S. But what exactly goes into investigating a foodborne outbreak?

Cyclosporiasis outbreak linked to shredded iceberg lettuce expands to 9 states

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.

US health officials are investigating a new outbreak of a diarrhea-causing parasite

What we still don't know about the cyclosporiasis outbreak as cases rise

There may be other potential sources behind the outbreak.

RFK Jr. says cyclosporiasis outbreak is 'under control' amid at least 1,600 cases in 5 states

The outbreak has sickened at least 1,600 people in five states.