Officials have not yet identified the source of the latest outbreak but said they have begun traceback efforts.

Federal health officials have been investigating five different clusters of cyclosporiasis cases since the start of parasite season in May, the FDA said on Monday.

CDC confirms 4,173 U.S. Cyclospora cases as it investigates a lettuce-linked outbreak. More than 7,400 additional reports remain under review.

Infections caused by the parasite have led to more than 300 hospitalizations since May

Officials have not yet identified the source of the latest outbreak but said they have begun traceback efforts.