Economical effect of fasciolosis in sheep consists in sudden deaths of animals as well as in reduction of weight gain and wool production. In goats and cattle, the clinical manifestation is similar to sheep. However, acquired resistance to F. hepatica infection is well known in adult cattle. Calves are susceptible to disease but in excess of 1000 metacercariae are usually required to cause clinical fasciolosis. In this case the disease is similar to sheep and is characterized by weight loss, anemia, hypoalbuminemia and (after infection with 10,000 metacercariae) death. Importance of cattle fasciolosis consist in economic losses caused by condemnation of livers at slaughter and production losses especially due to reduced weight gain.In sheep and sometimes cattle, the damaged liver tissue may become infected by the Clostridium bacteria C. novyi type B. The bacteria will release toxins into the bloodstream resulting in what is known as black disease. There is no cure and death follows quickly. As C. novyi is common in the environment, black disease is found wherever populations of liver flukes and sheep overlap. Cause
Fasciolosis is caused by two digenetic trematodes F. hepatica and F. gigantica. Adult flukes of both species are localized in the bile ducts of the liver or gallbladder. F. hepatica measures 2 to 3 cm and has a cosmopolitan distribution. F. gigantica measures 4 to 10 cm in length and the distribution of the species is limited to the tropics and has been recorded in Africa, the Middle East, Eastern Europe and south and eastern Asia.
Axenfeld–Rieger syndrome is a rare  autosomal dominant disorder, which affects the development of the teeth, eyes, and abdominal region.Axenfeld–Rieger syndrome is part of the so-called iridocorneal or anterior segment dysgenesis syndromes, which were formerly known as anterior segment cleavage syndromes, anterior chamber segmentation syndromes or mesodermal dysgenesis. Although the exact classification of this set of signs and symptoms is somewhat confusing in current scientific literature, most authors agree with the classification cited here. Axenfeld Anomaly is known as the development of a posterior embryotoxon, associated with strands of the iris adhered to a Schwalbe line that has been displaced anteriorly, which when added to glaucoma is called Axenfeld Syndrome. Riegers Anomaly is defined by a universe of congenital anomalies of the iris, such as iris hypoplasia, corectopia or polycoria. When systemic findings are added to Riegers anomaly, such as bone, facial and/or dental defects, it is known as Rieger syndrome. The combination of both entities gives rise to the Axenfeld-Rieger Anomaly when there are no systemic abnormalities and Axenfeld-Rieger Syndrome when there are.Axenfeld-Rieger Syndrome, is a rare disease that affects the eye bilaterally, with an estimated prevalence of 1/200,000 people, without gender predilection, and is characterized by autosomal dominant inheritance with complete penetrance of variable expressivity. The genes that have been identified in approximately 50% of cases are PITX2 and FOXC1.