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 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