Helminth infections used to be common in the humans in Denmark. The whipworm (Trichuris sp.) and roundworm (Ascaris sp.) are of particular interest as they produce very hard-shelled eggs, which allow them to be recovered in the environment after extended periods of time. In this project we will investigate how the diversity of food-borne parasitic infections has changed with cultural and dietary habits, hunting practice and intensity of animal husbandry. This is done by isolating and typing ancient DNA remains from parasite eggs found in archeological samples from across Denmark.