Abstract
A pair of O4,5,12 and O9,12 his+ sister transductants derived from a virulent Salmonella typhimurium parent were used as intraperitoneal and oral challenge strains to determine whether immunity directed against the O9 and O4,5 antigenic components could be detected after immunization with heat-killed vaccines containing one or the other of these antigenic components. Challenge with a mixture (ca. 1:1) of the two strains and culturing of livers and spleens at intervals indicated that the O4,5,12 strain multiplied to a greater extent than the O9,12 strain after both oral and intraperitoneal challenge of CF1 and C57BL/6J control mice. Immunization with O4,5,12 or O9,12 vaccine resulted in diminished bacterial counts from the livers and spleens for the homologous strain but had little effect on the heterologous strain. The diminution of the homologous strain was more evident after intraperitoneal challenge but was clearly demonstrable after oral challenge, particularly in the C57BL/6J mice. Of several live vaccines tested, an FOR S. typhimurium (O4,5,12) strain phenotypically smooth but avirulent seemed the most promising, suppressing the multiplication of both members of the challenge pair. After oral challenge suppression of the O4,5,12 strain was greater. These results indicate that the specific immune response directed against either the O4,5 (O-acetyl abequose) or the O9 (tyvelose) antigen is a measurable component of the overall response after both intraperitoneal and oral challenge.
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Selected References
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