1. Methods for preparing small amounts of Type I meningococcal polysaccharide which are electrophoretically homogeneous and contain only traces of other immunologically reactive material are given.
2. These polysaccharides are very poor antigens in man but in a small number of instances definite amounts of precipitin and protective antibody were formed.
3. The significance of these findings is discussed.
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Copyright, 1944, by The Rockefeller Institute for Medical Research New York
1944
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