Assessment of Safety Profile of MVA-BN Vaccine in the PALM-007 Study in DRC

Cohort Events Monitoring (CEM) Study for the Assessment of Safety Profile of MVA-BN (Jynneos) Vaccine in Adult Personnel and Staff in the PALM-007 Study in Democratic Republic Of The Congo

The goal of this observational study is to monitor and assess the safety profile of the MVA-BN vaccine among staff and study personnel of the PALM-007 study in the Democratic Republic of the Congo. The main questions it aims to answer are:

• To estimate the incidence of serious adverse events (SAEs) in all individuals vaccinated with the MVA-BN vaccine
• To estimate the incidence of adverse events (AEs) after each dose of MVA-BN vaccine.

Participants will receive two doses of vaccine and will be actively followed up to the 28th day after their last dose of MVA-BN vaccine.

Study Overview

• Status: Completed
• Conditions: Monkeypox
• Intervention / Treatment: Biological: MVA-BN vaccine

Detailed Description

All personnel and staff of the PALM-007 study will be offered the opportunity to participate in the study by reviewing and signing the informed consent. After signing informed consent, participants will be examined. The following parameters will be assessed:

• Anthropometric measurements (weight, height)
• Vital signs: temperature (axillary), blood pressure, heart rate and respiratory rate
• Medical history, including history of orthopox virus disease, vaccination, current co-morbidities and medication(s)
• Physical examination
• Pregnancy test will be done for all women of childbearing potential

If a participant has met all eligibility criteria, they will be enrolled and will receive the vaccine as specified below. Participants who are excluded because of fever can be rescreened and included after resolution of the fever and its cause.

Enrolled participants will receive the MVA-BN vaccine by subcutaneous injection of 0.5 mL in the shoulder (left or right).

The first dose will be administered at the time of enrollment and the second dose 28 days later.

After each vaccination, the participant will remain under observation for 30 minutes. All AEs occurring during this period of observation will be recorded and reported to the National Center for Pharmacovigilance and to the ethics committee according to Congolese regulations.

Follow-up of participants:

Participants will be followed until 28 days after the second dose of vaccine. Follow-up visit will be done either in person at National Institute of Biomedical Research (INRB) in Kinshasa and at the Monkeypox treatment centers in the PALM-007 study or by phone calls on Day 3, Day 14, and Day 28 post each vaccination. Study participants will be provided with contact information of vaccine research staff and have the right to contact the research team either directly or by phone if they have any questions about post-vaccination reactions they may be experiencing or if they are concerned. There is a window of +/- one day for each study visit except the day of the second dose which can be done on day 28 after the first dose with a window of +7 days. This second dose must not be given before Day 28. During each visit, participants will be asked to report to the research team AEs via open-ended questions. All SAEs will be followed-up. SAEs that have not resolved by the end of the per-protocol follow-up period for the subject (Day 28 after second dose) are to be followed until final outcome is known (to the degree permitted by the IRB-approved informed consent form). If it is not possible to obtain a final outcome for an SAE (e.g., the participant is lost to follow-up), the last known status and the reason a final outcome could not be obtained will be recorded by the investigator on an SAE report update and the CRF.

On the day of administration of the second dose of vaccine, vital signs, and physical examination will be done to all participants and a pregnancy test will be done on all women of childbearing potential prior to vaccine administration. If the pregnancy test is positive, the second dose will not be given, and the participant will be followed up as described in the protocol. Participants will be instructed to report any AEs that are experienced outside of the protocol defined follow up days. The reporting form of the national pharmacovigilance system of the DRC will be used for reporting. The research team will complete the notification form which will be sent to the National Pharmacovigilance Center (CNPV) by e-mail (scanned copies).

• Study Type: Interventional
• Enrollment (Actual): 500
• Phase: Phase 4

Contacts and Locations

Study Locations

• Democratic Republic of the Congo
  • Kinshasa, Democratic Republic of the Congo
    • Institut National de Rescherche Biomédicale (INRB)
  • Kole, Democratic Republic of the Congo
    • L'Hôpital Général de Référence de Kole
  • Tunda, Democratic Republic of the Congo
    • L'Hôpital Général de Référence de Tunda

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Provides written informed consent
• 18 years of age or older
• At high risk for Monkeypox infections
• Personnel and staff associated with the PALM 007-Monkeypox study sites in the DRC
• Willingness and ability to communicate AEs to study personnel

Exclusion Criteria:

• Allergy to MVA-BN or any of its components
• Pregnant or breastfeeding women
• Fever (axillary temperature ≥37.5°celsius)
• People who have already received the MVA-BN vaccine (in routine vaccination or another study involving this vaccine)
• Participants who, in the judgement of the investigator, will be at significantly increased risk as a result of participation in the study
• Individuals with any condition or circumstance that would render them unable to comply with study procedures (e.g., not reachable by phone)

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: MVA-BN vaccine; 2 doses of 0.5 mL MVA-BN vaccine injected subcutaneously and given at least 28 days apart	Biological: MVA-BN vaccine; A live vaccine produced from the Modified Vaccinia Ankara-Bavarian Nordic strain (MVA-BN), an attenuated and non-replicating orthopox virus; Other Names: JYNNEOS

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Frequency of SAEs After First Dose of MVA-BN Vaccine	Number of participants with an SAE up to 14 days after dose	Within 14 days of first vaccine dose
Frequency of SAEs After Second Dose of MVA-BN Vaccine	Number of participants with an SAE up to 14 days after dose	Within 14 days of second vaccine dose
Frequency of AEs After First Dose of MVA-BN Vaccine	Number of participants with an AE within 14 days of first vaccine dose	Within 14 days of first vaccine dose
Frequency of AEs After Second MVA-BN Vaccine Dose	Number of participants with an AE up to 28 days after second vaccine dose	Within 28 days of second vaccine dose

Collaborators and Investigators

• Sponsor: National Institute of Allergy and Infectious Diseases (NIAID)
• Collaborators: Institut National de Recherche Biomédicale. Kinshasa, République Démocratique du Congo

Study record dates

Study Major Dates

• Study Start (Actual): March 23, 2023
• Primary Completion (Actual): June 28, 2024
• Study Completion (Actual): June 28, 2024

Study Registration Dates

• First Submitted: February 7, 2023
• First Submitted That Met QC Criteria: February 15, 2023
• First Posted (Actual): February 21, 2023

Study Record Updates

• Last Update Posted (Actual): February 12, 2026
• Last Update Submitted That Met QC Criteria: January 27, 2026
• Last Verified: January 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Infections; Virus Diseases; Poxviridae Infections; DNA Virus Infections; Animal Diseases; Primate Diseases; Rodent Diseases; Mpox, Monkeypox; Anti-Infective Agents; Antiviral Agents; smallpox and monkeypox vaccine modified vaccinia ankara-bavarian nordic
• Other Study ID Numbers: PALM 008

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: Yes