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==Overview==

==Overview==

''Ostertagia spp.'' are small bursate nematodes that parasitse the gastrointestinal tract of mammals and birds. These species are responsible for mortality and morbidity in a number of ruminants especially ''O. ostertagi'' which is widely considered the most important parasite of cattle.

''Ostertagia spp.'' are small bursate nematodes that parasitise the gastrointestinal tract of mammals and birds. These species are responsible for mortality and morbidity in a number of ruminants especially ''O. ostertagi'' which is widely considered the most important parasite of cattle.

==''Ostertagia ostertagi''==

==''Ostertagia ostertagi''==