Discussion
The interaction between somatic antigens and specific antibodies is
Answer: A
Correct answer: slow and fine granular sediment forms in 18-20 hrs. agglutinate do not break upon shaking
Somatic (O) antigens are lipopolysaccharide, lying on the cell surface itself, so the cells are drawn tightly together: agglutination is slow, the deposit is fine and granular, and it does not redisperse when shaken. Flagellar (H) agglutination is the opposite - rapid, loose and flocculent, and easily broken up.
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