"MLF" wrote:
Enterobacters have Three antigens. O is the Cell surface polysaccharide, so thats the answer in this case.
K is the capsular antigen and H is the flagellar antigen. Its not a lipopolysaccharide, but just a polysaccharide of endotoxin. Look on page 185 of FA in micro, it explains the various antigens of this family.
Hi
Major antigens in Enterobacteriaceae group are :
K antigen: associated with polysaccharide capsules
H antigens: flagellar antigens important for the serotyping of Salmonella
O antigens:are somatic antigens.Differences in the polysaccharide chain of the lipopolysaccharide ( LPS,endotoxin ) determine the type of O antigen.
So,the right answer is E
THANKS
niti
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| Dr. Hussam
Forum Junior
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O antigen is just the polysaccharide part of the endotoxin
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| niti
Forum Guru
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"Dr. Hussam" wrote:
O antigen is just the polysaccharide part of the endotoxin
Yes ...this is exactly written in FA..
Endotoxin ( LPS ) is composed of 3 parts:
1) a polysaccharide core
2) O ( immunogenic ) antigen
3) and lipid A
Not all endotoxins are equally toxic;toxicity is depend on str. variations of lipid A.
O antigen is mainly one of the determinants of pathogenicity.
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| ashley23
Forum Junior
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O antigen is not part of the cell wall. It belongs to the Gram neg outer membrane and it is a chain of oligosaccharides units so , I think the right answer is A :roll:
___________________
El ashley23
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| azygous1
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