IMVAMUNE® Smallpox Vaccine in Adult Healthcare Personnel at Risk for Monkeypox in the Democratic Republic of the Congo

2016-12-01 16:08:22 | BioPortfolio


Monkeypox is a febrile rash illness caused by the monkeypox virus. Its natural occurrence in the DRC puts healthcare and frontline workers at high risk of acquiring monkeypox virus infections that can prevent them from performing work duties, compromise the overall healthcare delivery in an already fragile system, and can result in death (case fatality estimates are approximately 10%).

This is an open-label prospective cohort study in up to 1,000 eligible healthcare workers at risk of monkeypox infection through their daily work. The study will document monkeypox exposure and infection in participants while concurrently evaluating the immunogenicity and safety of the vaccine, IMVAMUNE, in healthcare personnel in the DRC. Participation in the study is voluntary and open to male and female healthcare personnel ages 18 years and older in Tshuapa Province in The Democratic Republic of Congo who are at risk of monkeypox virus infection through their daily work or laboratory personnel performing diagnostic testing for monkeypox virus.


Orthopoxvirus infections produce antibody responses that are cross-protective against other viruses within the genus. It is this property of orthopoxviruses that allows a vaccine for vaccinia virus against smallpox to be used to provide protection against monkeypox. Studies performed during and in the immediate aftermath of smallpox eradication demonstrated that smallpox vaccination (with a first generation vaccine) could confer protection against infection with monkeypox virus. Newer, third generation vaccines such as IMVAMUNE®, an attenuated (replication deficient) strain of vaccinia virus may offer an alternative safer source of vaccine-derived protection.

The clinical presentation of monkeypox infection is similar to smallpox, although it is less transmissible human-to-human than smallpox and less deadly (case fatality estimates for monkeypox are approximately 10%). Naturally-occurring human monkeypox is largely restricted to remote regions of the Congo Basin forest in Central Africa. This study is the first rigorous evaluation of IMVAMUNE® in a region where natural Orthopoxvirus transmission occurs at appreciable and predictable rates. Healthcare and frontline workers in the DRC are currently at high risk of acquiring monkeypox virus infection that prevents them from performing work duties, compromises healthcare delivery in an already fragile system, and can result in death.

This open-label prospective cohort study in up to 1,000 healthcare personnel at risk of monkeypox infection through their daily work will document monkeypox virus exposure and infection in vaccinated participants while concurrently evaluating the immunogenicity and safety of IMVAMUNE vaccine. Study participation is voluntary and open to male and female healthcare personnel ages 18 years and older in Tshuapa Province in the DRC. Participants will receive two subcutaneous doses of IMVAMUNE vaccine on days 0 and 28. Blood samples will be obtained on days 0, 14, 28, 42, 180, 365, 545, and 730 for immunogenicity analysis. After each vaccination participants will be observed for at least thirty minutes. They will maintain an adverse event diary to record systemic and local adverse events for 7 days after each immunization. They will also record exposure to the monkeypox virus in an exposure diary that is reviewed at each follow-up visit.

The study will evaluate the proportion of participants who after being vaccinated 1) develop suspected or confirmed monkeypox infection, and 2) experience exposure to monkeypox virus. The study will also evaluate the safety and immunogenicity of IMVAMUNE.

Study Design

Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Prevention


Monkeypox Virus Infection




Tshuapa site
Congo, The Democratic Republic of the


Not yet recruiting


Centers for Disease Control and Prevention

Results (where available)

View Results


Published on BioPortfolio: 2016-12-01T16:08:22-0500

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