Abstract
IT has been shown in calves which have experienced a substantial initial infection of H. placei that they develop a high level of immunity to further larval challenges and that the removal of a mature adult burden with phenothiazine therapy appears to delay the development of the immunity1,2. More recent work where calves had mature H. placei surgically implanted into the abomasum indicated that the implant conferred no immunity to the recipient calves to a challenge with 10,000 infective larvæ3.
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References
Roberts, F. H. S., Austral. J. Agric. Res., 8, 740 (1957).
Roberts, F. H. S., and Keith, R. F., Austral. Vet. J., 35, 409 (1959).
Ross, J. G., Armour, J., and Hart, J. A., J. Parasitol., 48, 496 (1962).
Rick, R. K., and Keith, R. F., Austral. Vet. J., 34, 93 (1958).
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ROSS, J. Immunogenic Activity of the Larval Stages of Haemonchus placei. Nature 197, 1221–1222 (1963). https://doi.org/10.1038/1971221b0
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DOI: https://doi.org/10.1038/1971221b0
