ClinicalTrials.gg
Status unknownNCT00582504VEE TC-83Updated Feb 11, 2021

Safety and Immunogenicity Study of the Venezuelan Equine Encephalomyelitis Vaccine

A Phase 2 interventional study of VEE TC-83 in Venezuelan Equine Encephalomyelitis, sponsored by U.S. Army Medical Research and Development Command. Status unknown at 1 site in United States. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-02-11.

Sponsored by U.S. Army Medical Research and Development Command · Phase 2, Interventional, and Prevention

The sponsor has not verified this record recently (last verified Feb 2021), so the status shown — last known as Active, not recruiting — may be out of date.

From the registry’s dates

  • Registered 3 months after the study started (first participant enrolled Sep 2007, registered Dec 2007).
Phase
Phase 2
Study type
Interventional
Enrollment
500
Allocation
Not applicable
Ages
18 Years to 65 Years
Sex
All
01

Study summary

This study is designed to determine safety of and immune response to Venezuelan Equine Encephalomyelitis Vaccine, Live, Attenuated, Dried TC-83, NDBR-102 (TC-83).

02

Conditions studied

  • Venezuelan Equine Encephalomyelitis

Keywords

  • Encephalitis,VEE
03

In context

Lead sponsor

U.S. Army Medical Research and Development Command is the lead sponsor of 153 studies on the registry; 8 are open to participants now.

Of its 23 completed or terminated interventional studies of FDA-regulated products, 16 (70%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 65 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • At least 18 years old
  • VEE PRNT80 \< 1:10 before immunization.
  • (females) Negative serum pregnancy test on same day before vaccination. Not planning pregnancy for 3 months.
  • Actively enrolled in the SIP
  • At risk for exposure to virulent VEE virus (with up-to-date risk assessment).
  • Up-to-date (within 1 year) physical examination/tests.
  • Sign and date the approved .
  • Willing to return for all follow-up visits.
  • Agree to report adverse event (AE) up to 28 days after vaccination.

Exclusion criteria

Exclusion Criteria:

  • Over age of 65 years.
  • abnormal lab results including evidence of , carrier state, or elevated liver function tests.
  • History of immunodeficiency or current treatment with medication.
  • (females) Currently breastfeeding.
  • Confirmed (HIV) titer.
  • Family history (first degree relative, but not elderly parent with late onset) diabetes, personal history gestational diabetes, or confirmed elevated fasting serum glucose (> 125 mg/dL).
  • Serious allergic reaction to guinea pigs/guinea pig products.
  • Any known allergies to components of the vaccine.
  • A medical condition that in the judgment of the Principal Investigator (PI) would impact subject safety (i.e-vaccination and or exposure to another alphavirus).
  • Administration of any vaccine within 28 days of TC-83.
  • Any unresolved AEs resulting from a previous immunization.
Terms in these criteria, in plain language(6)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

Hepatitis C tests

Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.

After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.

Hepatitis B tests

Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.

Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.

Immunosuppression

A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.

Read whether the line is about a condition or about medicines, and which medicines and doses it means.

HIV

The human immunodeficiency virus, which weakens the immune system.

Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.

05

Study design

Phase
Phase 2
Primary purpose
Prevention
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
500 participants (estimated)

Study arms

  • Experimental
    Vaccination

    VEE TC-83

    Biological: VEE TC-83

Interventions

  • BiologicalVEE TC-83

    Subjects will receive a single 0.5 mL dose by subcutaneous route in the upper outer aspect of arm

06

What researchers measure

Primary outcomes

  1. Number of participants with a 80% plaque-reduction neutralization titer (PRNT80)

    Time frame: 21-35 days, 42-56 days, 12-15 months

  2. Number of adverse events.

    Time frame: 7 years

Secondary outcomes

  1. Number of confirmed cases of VEE disease among vaccinated subjects who achieved a PRNT 80 ≥ 1:20.

    Time frame: 7 years

07

Study locations

1 site
  • U.S. Army Medical Research Institute of Infectious Diseases
    Fort Deterick, Maryland 21702, United States
08

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Started Sep 2007 (actual). Primary completion is estimated for Dec 2021, 171 months after the start.

How these figures are worked out, and which studies are left out of them.

Registered
Dec 19, 2007
First posted
Dec 28, 2007
StartActual
Sep 2007
Primary completionEst.
Dec 2021
CompletionEst.
Jun 2022
Last update
Feb 11, 2021
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Feb 11, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT00582504
Responsible party
Sponsor
First posted
Dec 28, 2007
Start date
Sep 2007
Primary completion
Dec 2021 (estimated)
Completion
Jun 2022 (estimated)
Last update
Feb 11, 2021

Study contacts

Ronald Reisler, MD
principal investigator · USAMRIID Medical Division

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is status unknown, as verified in Feb 2021. You cannot join it, but the record below documents what was studied.

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