The goals of the proposed study are to evaluate the safety, tolerability and immunogenicity of a GBS vaccine. Previous studies suggest that immune responses against GBS can protect humans from infection.

Inclusion Criteria:

• healthy females 18 through 40 years of age;
• have provided written informed consent after the nature of the study has been explained;
• are available for all visits scheduled for the study (i.e. are not planning to leave the area before the end of the study period);
• are in good health as determined by: medical history, physical assessment, clinical judgment of the investigator

Exclusion Criteria:

• unwilling or unable to give written informed consent to participate in the study;
• pregnant (serum pregnancy test)
• unwilling to use acceptable birth control from screening and until at least 3 months after the final immunization
• nursing (breastfeeding) mothers