Largest cyclospora outbreak ends , but origin remains unknown , officials say

Federal health officials announced on Friday that the largest cyclospora outbreak in United States history has officially concluded. The illness, caused by a microscopic parasite, affected a significant number of individuals across the country during the course of the event.

Despite the end of the outbreak, investigators have been unable to identify the specific source or origin of the contamination. Public health agencies have officially closed the investigation into the incident without determining the root cause of the infections.