S. typhimurium LPS

Salmonellae are Gram-negative, facultatively anaerobic bacteria of the family Enterobacteriaceae, made up of nonspore-forming rods, usually motile with flagella. Salmonella enterica serovar Typhimurium is the among the most common Salmonella serovars causing Salmonellosis food poisoning. S. typhimurium has a less alarming public image than S.typhi (which causes typhoid), but is a bigger health problem worldwide. Salmonellae possess 3 major antigens; the "H" or flagellar antigen (phase 1 & 2), the "O" or somatic antigen (part of the LPS moiety) and the "Vi" or capsular antigen (referred to as "K" in other Enterobacteriaceae). Salmonellae also possess the LPS endotoxin characteristic of Gram-negative bacteria. This LPS is composed of an "O" polysaccharide ("O" antigen) an "R" core and the endotoxic inner "Lipid A". Endotoxins evoke fever and can activate complement, kinin and clotting factors.

Salmonellae typhimurium lipopolysaccharides