Abstract
Summary
Solutions of dextran, both in the unhydrolyzed or native form and in the partially hydrolyzed or clinical form, gave precipitation reactions with antiserums of rabbits immunized with S. typhi, including vaccines prepared for human typhoid prophylaxis. Reactions also occurred with antiserums of some other Salmonella, particularly S. oranienburg. Among 5 samples of clinical dextran that had previously been used in studies on humans, 4 that had given fairly frequent untoward reactions had greater capacities to fix complement with S. typhi antiserums than did the one that had given no untoward reactions.
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