The parasite found in uncooked fresh produce contaminated with human feces has sickened thousands and hospitalized hundreds all over the U.S.

As state health officials scramble to find the source of the foodborne parasite, the CDC said Friday it’s unclear whether the outbreaks across the country are connected.

The Centers for Disease Control and Prevention on Friday reported that well over 800 cases of a food-borne parasite have been confirmed by 31 states.