The purpose of this study is to evaluate the long-term immune responses to the Herpes Zoster subunit (HZ/su) vaccine as well as safety up to 7 years after the 2-dose primary vaccination course from study ZOSTER-041.
This study will also assess immune responses as well as safety after revaccination with 2 additional doses of the HZ/su administered at 6 to 8 years after the 2-dose primary vaccination course.