One of the main issues for determining the source is the long time between consumption and symptoms, which can range from one to two weeks.
Cyclospora is an issue in fresh produce. "C. cayetanensis is a parasite that must live inside a human host for part of its life cycle, as well as living outside the host during an environmental phase. Although there are many species of Cyclospora, only C. cayetanensis has been known to cause illness in humans, an infection called cyclosporiasis. A person can become infected after ingesting food or water contaminated with the parasite."
Will heating destroy Cyclospora, such as with blanching? These does not seem to be any history for survival at elevated temperatures, but there are limited studies.
https://www.cdc.gov/parasites/cyclosporiasis/outbreaks/2023/index.html
Cyclosporiasis Illnesses in the United States, 2023
LAST UPDATED JUNE 22, 2023
Fast Facts
Illnesses: 210
Hospitalizations: 30
Deaths: 0
States reporting cases: 22
https://www.cdc.gov/parasites/cyclosporiasis/outbreaks/2023/index.html
Cyclosporiasis Illnesses in the United States, 2023
LAST UPDATED JUNE 22, 2023
Fast Facts
Illnesses: 210
Hospitalizations: 30
Deaths: 0
States reporting cases: 22