CompletedPhase 2

Dose Study of ACAM2000 Smallpox Vaccine in Previously Vaccinated Adults

United States357 participantsStarted 2003-01

Plain-language summary

The objective of this study is to determine the minimum dose of ACAM2000 needed to produce a cutaneous reaction in at least 90% of a population of healthy adults at least 28 years of age and previously vaccinated against smallpox.

Who can participate

Age range

28 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion criteria: * have a history of previous smallpox vaccination greater than 10 years previous to the date of screening and presence of a vaccination scar. * 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: * children 1 year of age or younger in the household or be in close contact * smallpox vaccination within ten years * known or suspected Human immunodeficient virus (HIV) infection, primary immunodeficiency disorder, leukemia, lymphoma, or current radiation treatment or use of immunosuppressive or anti-neoplastic drugs or have a household member or intimate contact with the conditions listed above. * renal disease * current or past history of eczema or a household member or direct contact who has eczema. * known allergy or past allergic reactions to latex gloves or to antibiotics which include neomycin, streptomycin, chlortetracycline, and polymyxin B * known allergy or past allergic reaction to blood products. * known allergy to cidofovir or sulfa-containing drugs. * history of allergic phenomena following smallpox vaccination in the past, including urticaria, erythema multiforme, or Stevens-Johnson syndrome. * transfusion of blood or treatment with any blood product. * current or history of drug or alcohol abuse * innoculation with any other li…

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

The Neutralizing Antibody Response Titers Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine

Timeframe: Day 30 post-vaccination

Participants With ≥ 4-fold Increase in Plaque-Reduction Neutralization Test (PRNT50) Titers Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine.

Timeframe: Day 30 post-vaccination

Number of Participants Reporting Adverse Events of Severe Intensity Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine

Timeframe: Days 0 to 30 post-vaccination

Trial details

NCT IDNCT00053482

SponsorEmergent BioSolutions

Sponsor typeINDUSTRY

Study typeINTERVENTIONAL

Primary completion2003-04

Results submitted2011-01-03

View on ClinicalTrials.gov More Smallpox trials

Who can participate

Age range

28 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

What they're measuring

The Neutralizing Antibody Response Titers Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine

Timeframe: Day 30 post-vaccination

Participants With ≥ 4-fold Increase in Plaque-Reduction Neutralization Test (PRNT50) Titers Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine.

Timeframe: Day 30 post-vaccination

Number of Participants Reporting Adverse Events of Severe Intensity Post-vaccination With ACAM2000 or Dryvax® Smallpox Vaccine

Timeframe: Days 0 to 30 post-vaccination