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ACAM2000 vaccine safety and immunogenicity considerations for smallpox and mpox
Vanja Komlenovic1, James McCarty2, David Cassie1
1Clinical Development, Emergent BioSolutions Canada Inc.,Winnipeg, MB, Canada.
Expert Review of Vaccines
|August 11, 2026
Summary
ACAM2000 is a live smallpox vaccine crucial for biodefense and mpox prevention. While highly effective, its use requires balancing benefits against a known safety risk profile.
Area of Science:
- Virology
- Vaccinology
- Biodefense
Background:
- Smallpox eradication in 1980 left populations without immunity.
- Monkeypox virus (MPXV) reemergence poses a global health threat.
- Continued Variola virus stocks present biodefense challenges.
Purpose of the Study:
- To review ACAM2000, a second-generation smallpox vaccine.
- To summarize its development, immunogenicity, efficacy, and safety.
- To assess its role in mpox prevention.
Main Methods:
- Literature review of ACAM2000 data.
- Analysis of immunogenicity and efficacy studies.
- Evaluation of safety and regulatory information.
Main Results:
- ACAM2000 demonstrates high immunogenicity and rapid protection.
- The vaccine offers broad orthopoxvirus coverage.
- A well-characterized safety risk profile exists.
Conclusions:
- ACAM2000 is vital for smallpox preparedness.
- It serves as a valuable, selective tool for mpox prevention.
- Balancing efficacy with safety is essential for its deployment.
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