Assessed solicited administration site events included pain, erythema/redness, swelling and Lymphadenopathy (defined as localized axillary, cervical or supraclavicular swelling or tenderness ipsilateral to the injection arm). Any = occurrence of the event regardless of intensity grade.

Assessed solicited systemic events included fever, chills, headache, myalgia, arthralgia and fatigue. Any = occurrence of the symptom regardless of intensity grade.

An unsolicited AEs is an AEs that was either not included in the list of solicited events or could be included in the list of solicited events but with an onset outside the specified period of follow up for solicited events. Unsolicited AEs must have been communicated by a participant who has signed the informed consent or through his/her caregiver. Unsolicited AEs include both serious and non-serious AEs. Any = occurrence of the symptom regardless of intensity grade or relation to study vaccination.

An SAE is defined as any untoward medical occurrence that resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in disability/incapacity, was a congenital anomaly/birth defect in the offspring of a study participant, or resulted in abnormal pregnancy outcomes, or in other situations that were considered serious per medical or scientific judgment.

The following events were considered as AESI in this study: severe hypersensitivity reactions within 24 hours after study intervention administration, myocarditis/pericarditis and potential immune-mediated diseases (pIMDs).

Clinically significant abnormal laboratory findings are those which are not associated with an underlying disease, unless judged by the investigator to be more severe than expected for the participants condition. Normal or missing values refer to laboratory values that were within normal range or missing at baseline.

Clinically significant abnormal laboratory findings are those which are not associated with an underlying disease, unless judged by the investigator to be more severe than expected for the participants condition. Normal or missing values refer to laboratory values that were within normal range or missing at baseline.

GMI is defined as the geometric mean of the ratios of the post-dose anti-vaccine antibody titers over the Day 1 anti-vaccine antibody titers.

SCR is defined as the percentage of dosed participants who have either an anti-vaccine antibody pre-dose titer \< 1:10 and a post-dose anti-vaccine antibody titer ≥ 1:40 or a pre-dose anti-vaccine antibody titer ≥ 1:10 and at least a 4-fold increase in post-dose anti-vaccine antibody titer.

SPR is defined as the percentage of dosed participants with a anti-vaccine antibody titer ≥ 1:40.