A lot. As long as eggs can be excreted with feces, polluted water and food can cause parasitic diseases. There are amoeba (dysentery), Taenia solium, Taenia solium, Taenia mansoni, Taenia canis, Clonorchis sinensis (Clonorchis sinensis), Paragonimus westermani (Paragonimus westermani), Fasciola hepatica (Fasciola hepatica), Schistosoma japonicum, Giardia lamblia (traveler's diarrhea), Ascaris lumbricoides and Trichinella spiralis in China.