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Excretory-secretory and somatic antigens of Ostertagia ostertagi fourth stage larvae, emulsified with complete Freund's adjuvant, were ip administered to calves on 3 occasions. Two weeks after the last immunisation all calves were infected with a single dose of 130 000 O. ostertagi 3rd stage...

Hilderson, H.; Berghen, P.; Graaf, D. C. de; Claerebout, E.; Vercruysse, J.
International Journal for Parasitology, 1995, 25, 6, pp 757-760