Animal Health

An adult alpaca (Lama pacos) had a locally extensive area of hepatic atrophy involving the right lobe. Grossly, the atrophic lobe was light tan and firm and contained small, raised, white to yellow, partially mineralized circular nodules predominantly at the periphery of the atrophic tissue. Microscopically, viable hepatocytes were not present in the atrophic area, and the tissue consisted of diffuse biliary epithelial proliferation without any evidence of nuclear or cellular atypia or the presence of mitotic figures. The circular mineralized nodules consisted of granulomatous inflammation with intralesional parasitic ova surrounded by fibrous connective tissue. Morphologically, the ova were compatible with those of Fasciola hepatica. The severe biliary hyperplasia was unusual, and it was not clear whether it was caused by an aberrant host response to the parasitic infection or whether it was an unrelated event. more »

Liver fluke is the common name of the trematode, Fasciola hepatica. The parasite is found worldwide and is the only liver fluke found in Australia. Infection can lead to reduced productivity and death and costs millions of dollars each year in lost production (meat, wool, milk, liver condemnation, secondary infection, replacement stock requirements), stock deaths and costs of treatment and prevention. The fluke mainly affects cattle and sheep, but can also affect alpacas, goats, horses, pigs, kangaroos, wombats, rabbits and deer. Humans may also be infected, for example after eating watercress collected from fluke-infested creeks or following use of contaminated water on vegetable gardens. The adult fluke is a pale brown or grayish-brown flat worm about 1.5-4 cm long that lives in the bile ducts of the liver (Figure 1). more »

Alpacas are susceptible to cattle, goat and sheep worms, however the four most likely to cause problems with alpaca are: Barber’s Pole Worm (Haemonchus contortus) up to 10,000 eggs per day Small Brown Stomach Worm (Ostertagia ostertagi) 100-200 eggs per day Black Scour Worm (Trichostrongylus spp) 100-200 eggs per day Liver Fluke (Fasciola hepatica) 20,000-50,000 eggs per day The eggs are passed out in the faeces and can remain in the paddock for long periods, until warm moist conditions are present and they begin to hatch into infective larvae. Alpacas with a worm burden can be passing eggs in their faeces over winter with the eggs not hatching due to the cold, only to have millions of eggs begin hatching when the warm spring days arrive. This sudden arrival in the paddock of millions of larvae can result in sudden and severe worm infestations with severe consequences. more »