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© Research
Publication : Microbial pathogenesis

Comparison of the abilities of Salmonella typhimurium rpoS, aroA and rpoS aroA strains to elicit humoral immune responses in BALB/c mice and to cause lethal infection in athymic BALB/c mice

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Microbial pathogenesis - 26 Jun 1999

Coynault C, Norel F

Link to Pubmed [PMID] – 10343058

Microb. Pathog. 1999 Jun;26(6):299-305

Salmonella typhimurium rpoS and rpoS aroA mutants are effective live vaccines in the murine model of salmonellosis (Coynault et al., Mol. Microbiol. 1996; 22: 149-60). Here, we further investigate the characteristics of these vaccines. The systemic humoral response induced by S. typhimurium rpoS, aroA and rpoS aroA vaccine candidates against S. typhimurium LPS was studied by ELISA. In BALB/c mice, the rpoS aroA strain induced a systemic anti-LPS humoral response similar to that induced by the rpoS and aroA strains. The virulence of aroA and rpoS aroA vaccines in nude (nu/nu) BALB/c mice was also compared. Salmonella typhimurium aroA and rpoS aroA vaccines both produced slowly progressing lethal infections in athymic mice inoculated i.p. but the rpoS aroA strain was more attenuated than the aroA strain, as determined by time to death and bacterial counts in spleens. Finally, a rpoS mutant of Salmonella dublin conferred protection in mice against an oral challenge with a wild-type strain of S. dublin whereas a rpoS mutant of S. typhimurium did not. This suggests that the protection provided by the S. typhimurium rpoS vaccine is serotype-dependent.

http://www.ncbi.nlm.nih.gov/pubmed/10343058