16 out of 97
True of O antigen of Enterobacteriaceae
|A|| are susceptible to heat|
|B|| usually not detected by bacterial agglutination|
|C|| most external part of cell wall LPS|
|D||is of single antigenic type|
Ans. C Most external part of cell wall LPS
a. The O antigen is the outermost part of the LPS. It is polysaccharide in nature and its structure varies with the genus and species of the bacterium.
b. It is used in serotyping of several gram negative bacteria.