The life cycle is the same as that of ''O. ostertagi'' described above.
The life cycle is the same as that of ''O. ostertagi'' described above.
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====Epidemiology and Pathogenesis====
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''T. circumcincta'' and ''O. trifurcata'' are responsible for clinical disease predominantly in lambs. The Pathophysiology of the disease is analogous to [[Ostertagiasis|ostertagiasis]] in cattle, though the type II form of disease is not seen as often in sheep and goats.