Researchers in Shiraz, Iran found that cockroaches can carry Enterocytozoon bieneusi, a dangerous fungal parasite that causes severe diarrhea in people with weak immune systems. The study collected and tested 378 cockroaches from hospitals and public areas, discovering three positive cases. While the arid climate of Shiraz appears to limit how well these pathogens survive compared to tropical regions, the presence of parasites in hospital cockroaches poses real health risks, especially for vulnerable patients. Better pest control and sanitation in hospitals are essential to prevent spread.