Abstract
Summary
A polysaccharide yielding osazone resembling that of Arabinose with a melting point of 166°-168°C has been isolated from the supernatant of the Haffkine plague vaccine as well as from the specific soluble protein and, to a less extent, from the bacterial debris of both virulent and avirulent protective plague strains. It is absent in non-protective avirulent plague and pseudotuberculosis organisms. The protective substance of the plague bacillus is probably a polysaccharide-protein complex.
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