Study Evaluating the Duration of Immunity in Healthy Adult Volunteers Who Completed Study 6108A1-500

Duration of Immunity in Healthy Adult Volunteers Who Completed Study 6108A1-500

Upon completion of participation in the 6108A1-500 study, subjects will be asked to consent for this duration of immunity study to provide up to two additional blood samples. SBA & IgG testing will be done on these samples taken at 6 & 12 months. The sites participating in this duration of immunity study are the same sites participating in the 6108A1-500 study.

Inclusion Criteria:

• Completed study 6108A1-500 (three doses administered and visit 9 completed).

Exclusion Criteria:

• Bleeding diathesis or condition associated with prolonged bleeding time.
• Any clinically significant chronic disease that, in the investigators judgment may be worsened by blood draw.