Abstract
An investigation was made to find out the substance present in B. pertussis responsible for the enhancement of IgE antibody production in guinea pigs. Antigen was injected in guinea pigs along with either ribonucleic acid, deoxyribonucleic acid, lymphocytosis promoting factor or Hpopolysaccharide obtained from B. pertussis. It was concluded that the Hpopolysaccharide is the main active material responsible for the enhancement of IgE antibody production in guinea pigs.

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