Federal health officials have linked four more states to an outbreak of a diarrhea-causing parasite

Some US states are facing a large and growing outbreak of diarrhea caused by cyclospora, a microscopic parasite that can contaminate fresh food or water.

U.S. health officials are investigating a new outbreak involving the diarrhea-causing parasite cyclospora

Investigators believe additional states will help them better construct how cyclosporiasis moved through the nation's food supply.