Abstract:It has been shown by a number of workers that saline suspensions of Salmonella typhi lose their Vi activity rapidly, while dried organisms retain the ability to stimulate antibody production and to react with Vi antibody. Chu & Hoyt (1954) found that the Vi haptene, although very soluble in water, retains its antigenic specificity even when autoclaved for 30 min. at 20 lb. pressure. A vaccine prepared by harvesting Vi-positive organisms in alcohol, which were then dried and resuspended in peanut oil, was fou… Show more
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