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Safety, False-Positive Reactions and Sensitizing Properties of Leishmania Tropica Skin Test Antigen

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT00633009
Recruitment Status : Completed
First Posted : March 11, 2008
Results First Posted : December 6, 2012
Last Update Posted : November 20, 2013
Sponsor:
Collaborator:
U.S. Army Medical Research and Development Command
Information provided by (Responsible Party):
Nielsen BioSciences, Inc.

Study Description
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Brief Summary:
The efficacy of LtSTA as a skin test antigen depends upon the sensitivity and specificity of the product. This study has been designed to measure the skin test responses to 15, 30, or 50µg doses of LtSTA. The measurements of non-specific reactivity due to components of the antigen solution and the product's ability to sensitize lymphocytes of Leishmania naïve persons when administered intradermally. The presence or absence of a local inflammatory response to the first skin test with each of three doses of LtSTA will provide insight on the specificity of the antigen in a naïve population. The local inflammatory response to LtSTA following the first and second repeat skin tests will indicate if the antigen is sensitizing after intradermal administration.

Condition or disease Intervention/treatment Phase
Cutaneous Leishmaniasis Biological: Leishmania tropica Skin Test Antigen (LtSTA) Biological: Leishmania tropica Skin Test Antigen Placebo (Placebo) Phase 2

Study Design
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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 50 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Screening
Official Title: A Blinded, Placebo Controlled Study Evaluating Safety, False-Positive Reactions and Sensitizing Properties of Leishmania Tropica Skin Test Antigen (LtSTA)
Study Start Date : August 2008
Actual Primary Completion Date : September 2009
Actual Study Completion Date : January 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Leishmaniasis

Arms and Interventions
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Arm Intervention/treatment
Active Comparator: LtSTA 15 ug
Naive volunteers tested with 15 ug injection of LtSTA. Participants were skin tested on visits 3, 6 and 9 of the study. The results of the skin tests were read after 48 hours (+/- 6 hours) on visits 4, 7 and 10. A final evaluation was performed on visit 11, fourteen days after visit 10.
 Biological: Leishmania tropica Skin Test Antigen (LtSTA)
Administer 15 ug, 30 ug or 50 ug of LtSTA into DTH positive volunteers. Repeat drug administration 30 days after initial injection and 60 days after initial injection. Read and interpret reaction 48 hours after each injection. Observe subjects for conversion or adverse reaction.

Biological: Leishmania tropica Skin Test Antigen Placebo (Placebo)
Administer Placebo concurrently with 15 ug, 30 ug and 50 ug doses of LtSTA. Read and interpret the reaction 48 hours after injection. Observe subjects for reaction to Placebo
Active Comparator: LtSTA 30 ug
Naive volunteers tested with 30 ug injection of LtSTA.Participants were skin tested on visits 3, 6 and 9 of the study. The results of the skin testes were read after 48 hours (+/- 6 hours) on visits 4, 7 and 10. A final evaluation was performed on visit 11, fourteen days after visit 10.
 Biological: Leishmania tropica Skin Test Antigen (LtSTA)
Administer 15 ug, 30 ug or 50 ug of LtSTA into DTH positive volunteers. Repeat drug administration 30 days after initial injection and 60 days after initial injection. Read and interpret reaction 48 hours after each injection. Observe subjects for conversion or adverse reaction.

Biological: Leishmania tropica Skin Test Antigen Placebo (Placebo)
Administer Placebo concurrently with 15 ug, 30 ug and 50 ug doses of LtSTA. Read and interpret the reaction 48 hours after injection. Observe subjects for reaction to Placebo
Active Comparator: LtSTA 50 ug
Naive volunteers tested with 50 ug injection of LtSTA.Participants were skin tested on visits 3, 6 and 9 of the study. The results of the skin testes were read after 48 hours (+/- 6 hours) on visits 4, 7 and 10. A final evaluation was performed on visit 11, fourteen days after visit 10.
 Biological: Leishmania tropica Skin Test Antigen (LtSTA)
Administer 15 ug, 30 ug or 50 ug of LtSTA into DTH positive volunteers. Repeat drug administration 30 days after initial injection and 60 days after initial injection. Read and interpret reaction 48 hours after each injection. Observe subjects for conversion or adverse reaction.

Biological: Leishmania tropica Skin Test Antigen Placebo (Placebo)
Administer Placebo concurrently with 15 ug, 30 ug and 50 ug doses of LtSTA. Read and interpret the reaction 48 hours after injection. Observe subjects for reaction to Placebo


Outcome Measures
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Primary Outcome Measures :
  1. Sensitizing Effects of LtSTA in Leishmania Naive Adults [ Time Frame: 62 days ]
    Skin test response of subjects in the trial were evaluated 48 hours post injection after each of three skin test given at 30 day intervals in naive individuals (no exposure to the Leishmania organism). (Actual times 0, 30 and 60 days).The outcome measure was designated as number of participants who became sensitized to the Leishmania antigen. This is defined as those participants that had a negative skin test result, followed by a positive response in a subsequent skin test without having been exposed to the Leishmania organism.


Secondary Outcome Measures :
  1. The Safety of 15, 30 and 50µg/0.1mL Doses of LtSTA in Healthy Adult Volunteers Who Have Had no Known Previous Exposure to Leishmania Parasites [ Time Frame: 74 days ]
    Local and systemic events following skin test. Local: burning, itching, pain. Systemic: Body aches, dizziness, nausea, weakness.


Eligibility Criteria
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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Male or Female in good health;
  • Age 18 - 60 years;
  • No past history of leishmaniasis or prior participation in a Leishmania study;
  • No prior skin test with a Leishmania antigen;
  • No occupational, residential, or travel exposure to Leishmania;
  • Positive Candin® or Trichophyton skin test (>= 5 mm induration).

Exclusion Criteria:

  • History of adult atopic dermatitis, contact dermatitis to multiple agents, unexplained urticaria, or asthma;
  • Active allergic rhinitis or conjunctivitis;
  • History of allergy or reactions to phenol, polysorbate 80, or glycerol;
  • Medications: currently taking (within the last month) antihistamines or recent history of taking (within the last 1 year) corticosteroids, immunosuppressants;
  • Splenectomy;

  • Active medical disease*;

    *Active Medical Disease: Any active physical or psychiatric condition that may increase the risks associated with participation in the study or interferes with the interpretation of study results. Included chronic medical illnesses are cardiovascular disease, renal insufficiency, chronic respiratory illness, cirrhosis, chronic hepatitis, chronic pancreatitis, chronic diarrhea, malnutrition, malignancy, autoimmune disease, and asthma.

  • Pregnancy or lactating;
  • Immunization within 4 weeks;
  • History of leishmaniasis;
  • Occupational exposure to Leishmania;
  • Prior participation in a Leishmania study;
  • Prior skin test with Leishmania antigen;
  • Travel history to Leishmania endemic areas;
  • Abnormal screening lab results;
  • Keloid scar formation
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00633009


Locations
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United States, California
California Research Foundation
San Diego, California, United States, 92103-6204
Sponsors and Collaborators
Nielsen BioSciences, Inc.
U.S. Army Medical Research and Development Command
Investigators
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Study Director: Harry S Nielsen, Ph.D. Nielsen BioSciences, Inc.
Principal Investigator: Donald M Brandon, M.D. California Research Foundation
More Information
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Additional Information:

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Responsible Party: Nielsen BioSciences, Inc.
ClinicalTrials.gov Identifier: NCT00633009    
Other Study ID Numbers: LtSTA-08
First Posted: March 11, 2008    Key Record Dates
Results First Posted: December 6, 2012
Last Update Posted: November 20, 2013
Last Verified: October 2013
Keywords provided by Nielsen BioSciences, Inc.:
Leishmaniasis
Delayed-Type Hypersensitivity (DTH)
Skin Test
Conversion
Prior exposure to Leishmania major
Additional relevant MeSH terms:
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Leishmaniasis
Leishmaniasis, Cutaneous
Euglenozoa Infections
Protozoan Infections
Parasitic Diseases
 Infections
Skin Diseases, Parasitic
Vector Borne Diseases
Skin Diseases, Infectious
Skin Diseases