There are two liver flukes that commonly infect cattle in the United States: Fasciola hepatica and Fasciola magna. F. hepatica is the most common liver fluke of cattle. It is found mainly in the Gulf States, California and the Pacific Northwest. It is not considered a problem in cattle raised in Michigan. F. magna is found throughout North America primarily in the deer population which is its natural host.
Snails are the culprits.
Snails are the culprits.