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This parasite affects the animal gastrointestinal tract [2] in order to give to their offspring an alimentary source. Although not deadly, due to the usual low larva population that infests the animal, large larva populations can cause health issues to the host. For example, a typical horse can tolerate a hundred larvae without any effects.
By way of example, a parasite that reproduces in an intermediate host may require, as part of their life cycle, that the intermediate host be eaten by a predator at a higher trophic level, and some parasites are capable of altering the behavior of the intermediate host to make such predation more likely; [1] [2] a mechanism that has been called ...
C. pseudotuberculosis causes a disease known as caseous lymphadenitis that most commonly affects small ruminants, such as goats and sheep. [9] [10] The disease often presents with pyogranulomatous abscess formation. [11] Abscessation can occur in numerous areas, but it most commonly affects the cutaneous region and superficial lymph nodes.
Sheep and goats are both small ruminants with cosmopolitan distributions due to their being kept historically and in modern times as grazers both individually and in herds in return for their production of milk, wool, and meat. [1] As such, the diseases of these animals are of great economic importance to humans.
Sheep and goats: Anaplasma ovis – found worldwide. [13] There is a prevalence of 82.9% in sheep, and 74.9% in goats. This species is the most prevalent for causing anaplasmosis in sheep and goats, although Anaplasma phagocytophilium can also cause the disease. Anaplasma phagocytophilium has a prevalence of 11.9% in sheep, and 15.2% in goats. [14]
External parasites of primary concern from an economic perspective are biting flies, grubs, lice and ticks. Nuisance flies such as house flies and face flies, can affect cattle to a lesser degree.
Orf is a zoonotic disease, meaning humans can contract this disorder through direct contact with infected sheep and goats or with fomites carrying the orf virus. [6] It causes a purulent-appearing papule locally and generally no systemic symptoms.
Gastrointestinal nematodes may elicit a variety of host immune responses depending on the initial immune status of the host, parasite species, and environmental conditions. The body has several physical defense mechanisms against parasites including the continual sloughing of the gut epithelium to prevent parasite attachment. However, once an ...
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