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The adjuvant effect of a butanol-extracted water-soluble adjuvant (bu-WSA) obtained from Bacterionemia matruchotii, a gram-positive oral bacteria, was studied on the antibody response at the plaque-forming cell (PFC) level in murine spleens. Intraperitoneal injection of Bu-WSA caused significant increase in direct PFC numbers in spleens 1 to 3 days after the antigenic stimulation with sheep erythrocytes (SRBC). Injection of 100 to 800 microgram of Bu-WSA was effective, and 400 microgram of Bu-WSA seemed to be the optimum for induction of the adjuvant effect. The adjuvant effect was strongest when Bu-WSA  was injected at the same time as the SRBC, but some effect was still observed when Bu-WSA was injected 7 days before or 1 day after the immunization. The adjuvant effect of Bu-WSA was greatest at high dose of antigen. The mice injected with Bu-WSA at the time of priming SRBC and then immunized with trinitrophenylated SRBC showed greater anti-trinitrophenyl PFC response than controls without the injection of Bu-WSA. These findings suggest that a part of the adjuvant effect of Bu-WSA depends on thymic cell function and another part does not.

Water-soluble adjuvant obtained from Bacterionema matruchotii