Liver Flukes in Missouri
There are two types of liver flukes found in the United States that affect cattle. One is known as the common liver fluke (Fasciola hepatica). It is predominately located in the Gulf Coast states and the Pacific Northwest. The other is known as the deer fluke or the giant liver fluke (Fascioloides magna). It is found in certain areas of the Gulf Coast, southern Atlantic seaboard, Rocky Mountain trench, Pacific Northwest and is widespread throughout the upper Great Lakes. It has also been identi fied in Missouri. Records from the University of Missouri Veterinary Diagnostic Laboratory indicate that deer flukes were identified in livestock as early as January of 2011. However, by December of 2021 a limited number of additional cases had been reported. Most of these cases are from counties that lie north of Interstate 70 and along and east of Highway 63. Local veterinarians continue to be the best source of information on the presence and distribution of the fluke within an area. Veterinarians in regions that border the affected area should be on the lookout in case the population is expanding.