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

SummaryThe clinical and serological testing of a group Y meningococcal polysac-charide 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 weeks after receiving the vaccine.