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Vaccinia virus: ACAM2000 smallpox vaccine

Phase 2

Smallpox | Monoclonal antibody | Infectious Disease |Emergent BioSolutions Inc.|Last Updated: Mar 18, 2024

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment353

FDA Designations

No designations recorded

Clinical trial landscape

Vaccinia virus: ACAM2000 smallpox vaccine · 1 trial · 1 indication

Phase 2 1
NCT00053495Effect of Dose, Safety, Tolerability of a New Smallpox Vaccine in Adults Without Previous Smallpox VaccinationSmallpox
COMPLETED353 Analytics
PHASE2COMPLETED
Effect of Dose, Safety, Tolerability of a New Smallpox Vaccine in Adults Without Previous Smallpox Vaccination
SmallpoxUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants Reporting Adverse Events of Severe Intensity Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine
Days 0 to 30 post-vaccination

The severity of each reported adverse event was classified by the investigator according to the following definitions. None - no symptom; Mild - awareness of sign or symptoms, but easily tolerated; Moderate - discomfort enough to cause interference with usual activity; and Severe - incapacitating with inability to work or perform usual activity.

Neutralizing Antibody Response Titers Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine.
Day 30 post-vaccination
Participants With ≥ 4-fold Increase in Plaque-Reduction Neutralization Test (PRNT50) Titers Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine.
Day 30 post-vaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Group 1: ACAM2000 Dose 1EXPERIMENTALParticipants will receive a single dose of ACAM2000 smallpox vaccine, 1.0x10-8th plaque-forming units (PFU)/mL on Day 0.
Group 2: ACAM2000 Dose 2EXPERIMENTALParticipants will receive a single dose of ACAM2000 smallpox vaccine, 2.0x10-8th plaque-forming units/mL on Day 0.
Group 3: ACAM2000 Dose 3EXPERIMENTALParticipants will receive a single dose of ACAM2000 smallpox vaccine, 1.0x10-7th plaque-forming units/mL on Day 0
Group 4: ACAM2000 Dose 4EXPERIMENTALParticipants received a single dose of ACAM2000 smallpox vaccine, 5.0x10-6th plaque-forming units/mL on Day 0
Group 5: Dryvax® VaccineACTIVE_COMPARATORParticipants will receive a single dose of Dryvax® smallpox vaccine, 1.0x10-8th plaque-forming units/mL on Day 0

Interventions

NameTypeDescription
Vaccinia virus: ACAM2000 smallpox vaccineBIOLOGICALGroup 1 dose: 1.0x10-8th PFU/ml Group 2 dose: 2.0x10-8th PFU/ml Group 3 dose: 1.0x10-7th PFU/ml Group 4 dose: 5.0x10-6th PFU/ml
vaccinia virus (calf lymph): DryvaxBIOLOGICALGroup 5 dose: 1.0x10-8th PFU/ml
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Eligibility Criteria

Age Range18 Years to 29 Years
SexALL
Healthy VolunteersYes
Study Sites4

Inclusion criteria: * females must not be pregnant, lactating and must agree to use an effective form of birth control for the 30 days following vaccination or unable to bear children. * agree to be available for the entire study and agree to comply with all requirements. Exclusion criteria: * mi...

Countries:United States
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Frequently asked questions about Vaccinia virus: ACAM2000 smallpox vaccine

What is ACAM2000 smallpox vaccine used for?

ACAM2000 smallpox vaccine is used for the prevention of smallpox, an infectious disease caused by the variola virus. It is a live vaccinia virus vaccine that is being studied for use in adults who have not previously received a smallpox vaccination.

Who makes ACAM2000 smallpox vaccine?

ACAM2000 smallpox vaccine is being developed by Emergent BioSolutions Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol EBS. The company is conducting clinical research to evaluate the vaccine's safety and tolerability.

What phase is ACAM2000 smallpox vaccine in?

ACAM2000 smallpox vaccine is in Phase 2 clinical development for smallpox. It is an investigational vaccine and has not yet been approved by regulatory authorities. The Phase 2 trial has been completed, and the vaccine remains under clinical investigation.

What clinical trials is ACAM2000 smallpox vaccine in?

ACAM2000 smallpox vaccine has one completed Phase 2 clinical trial, identified as NCT00053495. This trial evaluated the effect of dose, safety, and tolerability of the vaccine in 353 healthy adults aged 18 years and older in the United States who had no prior smallpox vaccination.

Is ACAM2000 smallpox vaccine a monoclonal antibody?

No, ACAM2000 smallpox vaccine is not a monoclonal antibody. It is a live vaccinia virus vaccine, which is a different modality. The vaccine is designed to elicit an immune response against the variola virus, the causative agent of smallpox.

Was the ACAM2000 smallpox vaccine trial randomized and blinded?

Yes, the Phase 2 clinical trial for ACAM2000 smallpox vaccine, NCT00053495, was a randomized, double-blind, active-controlled study. It enrolled 353 healthy adult volunteers in the United States to assess the vaccine's safety and tolerability at different doses.