An AESI (serious or nonserious) is defined as an AE or SAE of scientific and medical concern specific to the sponsor's product or program, for which ongoing monitoring and rapid communication by the investigator to the sponsor could be appropriate.

An SAE is defined as any event that: • Results in death • Is immediately life-threatening • Requires inpatient hospitalization or prolongation of existing hospitalization • Results in persistent or significant disability/incapacity • Is a congenital anomaly/birth defect • Is a spontaneous miscarriage Important medical events that may not result in death, be life-threatening, or require hospitalization may be considered SAEs when, based upon appropriate medical judgment, they may jeopardize the participant or may require medical or surgical intervention to prevent one of the outcomes listed in this definition. Examples of such medical events include allergic bronchospasm requiring intensive treatment in an emergency room or at home, blood dyscrasias or convulsions that do not result in inpatient hospitalization, or the development of drug dependency or drug abuse.

An MAAE is defined as an AE that results in a visit to a medical professional. Medically attended visits are defined as a telemedicine visit, physician's office visit, urgent care visit, emergency room visit, hospitalization, or death.

Assessed solicited local reactions were injection site pain, redness, swelling, and lymphadenopathy.

Assessed solicited systemic reactions were fever, headache, fatigue, myalgia, arthralgia, and chills.

An unsolicited AE is defined as any AE that is volunteered from the participant and occurs within 28 days after vaccination.