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. 1978 Jun;20(3):692–697. doi: 10.1128/iai.20.3.692-697.1978

Specific and nonspecific resistance in mice immunized with irradiated Myobacterium leprae.

P J Patel, M J Lefford
PMCID: PMC421914  PMID: 352954

Abstract

Following subcutaneous inoculation of irradiated Mycobacterium leprae (I-ML) into the left hind footpad of mice, there was increased resistance to Listeria monocytogenes, indicative of macrophage activation, at the immunization site. In spite of the high level of localized macrophage activation which was proportioned to the immunizing dose of I-ML, no such activity could be demonstrated systemically in these mice, as evidenced by the absence of increased resistance to an intravenous challenge with L. monocytogenes. Under these conditions, I-ML-immunized mice were nonetheless resistant to intravenous infection with either M. tuberculosis or M. bovis BCG, and this immunity was transferred to normal recipients using spleen or lymph node cells. Neonatal thymectomy completely abolished the development of antimycobacterial immunity after vaccination with I-ML, but immunity was restored by an intraperitoneal infusion of syngeneic thymocytes. Systemic nonspecific resistance could be generated in I-ML-immunized mice by an intravenous injection of disrupted I-ML. This study reveals that, after subcutaneous vaccination with I-ML, there is local accumulation of activated macrophages at the inoculation site and a widespread distribution of lymphocytes which are sensitized to mycobacterial antigens. Nonspecific resistance is mediated by the former cells and specific antimycobacterial immunity by the latter.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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