• Adults 18 to 55 years of age

• Healthy participants or participants with stable pre-existing medical conditions Pre-existing stable medical condition means a participant who: has full capacity of daily activity and no major medication modification within 3 months prior to Day 1; has not undergone surgical or minimally-invasive intervention or had any hospitalization/emergency room visit for the specific medical condition.

• Able to comply with the protocol schedule and procedures

• Able and willing to provide written informed consent

• If female of child-bearing potential and heterosexually active, has practiced adequate contraception for at least 28 days prior to vaccination, has negative pregnancy tests just prior to vaccination, and has agreed to continue adequate contraception through three months following the final trial injection

⁃ A premenopausal woman who has at least one of the following is considered not of childbearing potential:

• Documented hysterectomy

• Documented bilateral salpingectomy

• Documented bilateral oophorectomy

• Documented and current bilateral tubal ligation or occlusion