Enlarge / Fecal samples in sediment collected from beneath this stone toilet seat at Armon Hanatziv, circa mid-7th century BCE, showed evidence of a dysentery-causing parasite (Giardia II). So did samples from a near-identical stone toilet at House of Ahiel. (credit: Ya’akov Billig) Last year, we reported on an analysis of soil samples collected from a stone toilet found within the ruins of a swanky villa, revealing the presence of parasitic eggs from four different species.