- Cause : horses are relatively resistant to infection with Fasciola hepatica and F. gigantica .
- Diagnosis : fascioliasis in horses, when it does occur, probably goes undiagnosed much of the time, because infections do not reach patency and/or techniques to detect fluke eggs are not a routine part of parasitological examination of equine feces.
- Signs : horses are unlikely to exhibit acute clinical signs as a result of liver fluke infection. Chronic signs, including abdominal pain, may occur and go undiagnosed.
- Prognosis : good if clinical cases treated; may resolve spontaneously without treatment.
- Good if clinical cases are treated.
- Some cases may resolve spontaneously in the absence of treatment.
Expected response to treatment
- Resolution of anemia slowly after treatment.
- Return of serum GLDH [Blood: biochemistry - glutamate dehydrogenase] and gGT to normal levels within weeks of treatment.
- Disappearance of any fecal eggs within days of treatment.
Reasons for treatment failure
- Difficulty in reaching a specific diagnosis.
- Reinfection if horse is put back to graze on infected pastures.
- Relative resistance of immature flukes to chemotherapy.