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Tetanus toxin fragment C (TTFC) was expressed on the surface of the vaccine vector Streptococcus gordonii, a Gram-positive commensal bacterium of the human oral cavity. The immunogenicity of recombinant S. gordonii expressing TTFC was assayed in mice immunized by the parenteral and mucosal routes. High serum TTFC-specific IgG responses were induced in both BALB/c and C57BL/6 mice immunized subcutaneously...
Spores of various Bacillus species, including B. subtilis, B. cereus and B. clausii, are used as probiotics, although they are generally absent from the normal microflora of man. We used two nonpathogenic Bacillus species, B. subtilis and B. clausii, to follow the fate of spores inoculated intragastrically in mice. We did not find detectable amounts of vegetative cells in intestinal samples, probably...
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