Abstract
When mice immunized with Listeria monocytogenes were given a second injection of listeria, they showed an anamnestic immune response to intravenous challenge with listeria, as measured by enumeration of the viable infecting organisms in the spleens of the infected animals. This response was independent of the effects of the challenge dose. When mice immunized with living or heat-killed attenuated mycobacterial cells were boosted with living H37Ra, there was also an accelerated response to listeria challenge. The response was greater in the mice given the primary immunization with living cells than in those immunized with heat-killed cells. The response to listeria challenge in mice immunized and boosted with mycobacteria was of less magnitude than that in the mice immunized and boosted with listeria. Growth of listeria in the mice immunized and boosted with mycobacteria was retarded only during the first 2 days of the infection, whereas the infecting listeria in mice immunized and boosted with listeria were permanently inactivated. Mice immunized with mycobacterial ribosomal fraction and restimulated with living mycobacterial cells showed no accelerated response to listeria challenge. It is evident from these results that resistance to these organisms is specifically evoked, but that once evoked it is not completely nonspecific in action. Also, the resistance produced by the mycobacterial ribosomal fraction to challenge with mycobacteria is completely specific in action. Therefore, it has been shown that there are two mechanisms involved in acquired immunity to facultative, intracellular parasites. One is nonspecific and mediated by activated macrophages. The other is specific and mediated by a mechanism as yet unknown.
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Selected References
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