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  • Title: On the immunological response of young calves to light Nematodirus helvetianus infection.
    Author: Smith HJ.
    Journal: Can J Comp Med; 1973 Jul; 37(3):320-2. PubMed ID: 4270440.
    Abstract:
    Infecting parasite-free eight week old calves with 8,000 infective Nematodirus helvetianus larvae did not modify appreciably their response to a later heavy field challenge with N. helvetianus, Ostertagia ostertagi and Cooperia oncophora, although two of six animals did have smaller Nematodirus burdens.
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