Adler Dillman and research team headed to Blythe, California where there's presence of sick dogs swimming in rivers. They found two species of snails that carry namely H. americana. This infects mammals to survive then gets to the "veins of the intestinal lining". They warn that symptoms begin gradually with a loss of appetite, vomiting, diarrhea, and weight loss. Although incapable to cause disease to humans, Dillman is concerned that this parasite could contaminate urban drinking water.