Abstract
Summary
The protection afforded against Salmonella typhimurium (C5S) infection by antibodies to the common enterobacterial antigen (CA) was determined in Swiss albino and C57BL/6Ha mice; animals inoculated with the preimmunization sera from the identical rabbits served as controls. Comparison of death rates revealed that CA antisera, obtained from rabbits immunized with either the ethanol-soluble CA of Escherichia coli O111 or CA of E. coli O14, provided slight to moderate, but only temporary, protection against 10 LD50 or 1 × 104 LD50 challenge.
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