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Blood lymphocytes were prepared from 6 patients at various time intervals after the onset of tularemia and from 10 subjects after vaccination against this disease. Lymphocytes were also prepared from subjects who had been vaccinated 1 and 2 years previously. The lymphocytes were incubated in the presence of membranes of the vaccine strain. Lymphocytes obtained 2 weeks or later after onset of the disease responded to the membranes with increased deoxyribonucleic acid synthesis, whereas lymphocytes obtained earlier than 2 weeks after onset did not respond. Lymphocytes of the vaccinated subjects did not respond to the membranes of the vaccine strain before vaccination. Two to 4 weeks after vaccination lymphocytes from six of the vaccinees yielded a high response, and this response was consistently high for several months. Lymphocytes from four of the vaccinated individuals responded to a low extent only, and this was consistently low for several months. Lymphocytes from individuals vaccinated 1 year before testing responded to a similar extent to the membranes, as did lymphocytes from those who had been vaccinated 1 month previously. Lymphocytes from individuals vaccinated 2 years previously, however, showed a diminished response to the membranes. There was no correlation between titer of agglutinating antibodies and magnitude of lymphocyte reactivity.

Time of lymphocyte response after onset of tularemia and after tularemia vaccination