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Acquired Immunity to Trichostrongylus axei in Lambs: Investigations of the Development of Immune Competence

  • J. G. Ross (a1)

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Investigations are described in which lambs were given either 1,000 or 5,000 3rd stage infected larvae of T. axei at 2, G, or 10 weeks age and were subsequently challenged with 200,000 3rd stage larvae at either 5 or 7 months of age. The immunity acquired following primary infection was manifest by a reduction in the numbers and size of the worms developing after challenge infection.

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Gibson, T. E., 1952.— “The development of acquired resistance by sheep to infestation with the nematode Trichostrongylus axei”. J. Helminth., 26, 4353.
Lopez, V. and Urquhart, G. M., 1967.— “The immune response of Merino sheep to Hacmonchus contortus infection”. Proc. 3rd Inst. conf. Wld. Ass.Adv. Vet. Parasitol. Lyon, 153.
Manton, V. J. A., Peacock, R., Povnter, D., Silverman, F. A. and Terry, R. J., 1962.— “The influence of age or naturally acquired resistance to Haemonchus contortus in lambs”. Res. Vet. Sci., 3, 308314.
Ross, J. G., 1965.— “The role of the larval stages of Haemonchus placet infections of cattle in immunity”. J. Helminth., 37, 359368.
Ross, J. G., 1965.— “Anthelmintic field trials in sheep. A comparison of Haloxon and Phenothiazine treatment in ewes and lambs.Rec. agric. Res. Minist. Agric. Nth. Ire., 14, 4347.
Sinha, P. K., 1967.— “Active immunity against Trichostrongylus axei in sheep and rabbits”. Am. J. vet. Res., 28, 793798.
Todd, J. R. and Ross, J. G., 1968.— “Biochemical and hematological changes in the blood of normal sheep following repeated phlebotomy”. Br. vet. J., 124, 353.
Urquhart, G. M., Jarrett, W. F. H., Jennings, F. W., Mcintyre, W. I. M., Mulligan, W. and Sharp, M. C. C., 1966a.— “Immunity to Haemonchus contortus infection. Failure of X-irradiated larvae to immunize young lambs”. Am. J. vet. Res., 27, 16411643.
Urquhart, G. M., Jarrett, W. F. H., Jennings, F. W., Mcintyre, W. I.M., Mulligan, W. and Sharp, M. C. C., 1966b.— “Immunity to Haemonchus contortus infection. Relationship between age and successful vaccination with irradiated larvae”. Am. J. vet. Res. 27, 16451648.

Acquired Immunity to Trichostrongylus axei in Lambs: Investigations of the Development of Immune Competence

  • J. G. Ross (a1)

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