Clinical and Serological Evaluation of Purified Polysaccharide Vaccines Prepared from Neisseria meningitidis Group Y

Abstract
The clinical and serological testing of a group Y meningococcal polysaccharide vaccine is described. Only minor local reactions at the injection site were observed. High levels of bactericidal antibody were observed in 93% of the individuals 3 wk after receiving the vaccine.

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