Livestock manure contains many microorganisms, protozoa and viruses that may pose a risk to human and. animal health. Recent reviews on the current status of. parasitic diseases in Vietnam, including those of food-. borne trematode zoonoses and cysticercosis, have. highlighted the risks of disease transmission through. Animal manure and Human Excreta ( De et AL., 2003rd ). Highly contagious and pathogenic viral diseases such as. foot and mouth disease, classical swine fever and. Aujeszky's Disease, may spread through animal efflu-. ents into waterways and, when one farm is infected with. one of these diseases, may cause downstream farms to. be Exposed to a considerable risk of infection