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

Purpose

The efficacy of LtSTA as a skin test antigen depends upon the sensitivity and specificity of the product. This study has been designed to determine if a 15, 30, or 50µg dose shows non-specific reactivity due to components of the antigen solution and if the product has the 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	Intervention	Phase
Cutaneous Leishmaniasis	Biological: Leishmania tropica Skin Test Antigen (LtSTA) Biological: Leishmania tropica Skin Test Antigen Placebo (Placebo)	Phase II

MedlinePlus related topics:

Leishmaniasis

U.S. FDA Resources

Study Type:	Interventional
Study Design:	Screening, Randomized, Double Blind (Subject, Investigator), Parallel Assignment, Safety/Efficacy Study

Official Title:	A Blinded, Placebo Controlled Study Evaluating Safety, False-Positive Reactions and Sensitizing Properties of 15 ug, 30 ug and 50 ug Intracutaneous Doses of Leishmania Skin Test Antigen (LtSTA) in Adult Volunteers Without a History of Exposure to Leishmania Spp.

Further study details as provided by Allermed Laboratories, Inc.:

Primary Outcome Measures:

To determine the sensitizing effect of LtSTA on the outcome of repeat tests. [ Time Frame: 30 and 60 days ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:

To evaluate 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: 30 and 60 days ] [ Designated as safety issue: Yes ]

Estimated Enrollment:	36
Study Start Date:	May 2008
Estimated Primary Completion Date:	November 2008 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
1: Active Comparator Naive volunteers to be tested with 15 ug injection of LtSTA.	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.
2: Active Comparator Naive volunteers to be tested with 30 ug injection of LtSTA.	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.
3: Active Comparator Naive volunteers to be tested with 50 ug injection of LtSTA.	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.
4: Placebo Comparator Each volunteer to be tested with an injection of LtSTA Placebo.	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

Eligibility

Ages Eligible for Study:	18 Years to 60 Years
Genders Eligible for Study:	Both
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

Please refer to this study by its ClinicalTrials.gov identifier: NCT00633009

Contacts


Contact: Donald M Brandon, MD	619-291-2321

Contact: William B Davis, MD	619-291-2321

Locations


United States, California
	California Research Foundation	Not yet recruiting
	San Diego, California, United States, 92103-6204
	Contact: Brandon Jeffrey, MS 619-291-2321
	Principal Investigator: Donald M Brandon, M.D.
	Sub-Investigator: William B Davis, M.D.

Sponsors and Collaborators

Allermed Laboratories, Inc.

U.S. Army Medical Research and Materiel Command

Investigators


Study Director:	Harry S Nielsen, Ph.D.	Allermed Laboratories, Inc.

Principal Investigator:	Donald M Brandon, M.D.	California Research Foundation

More Information

Allermed Laboratories, Inc. This link exits the ClinicalTrials.gov site

Responsible Party:	Allermed Laboratories, Inc. ( Harry S. Nielsen, Ph.D. )
Study ID Numbers:	LtSTA-08
First Received:	March 3, 2008
Last Updated:	May 28, 2008
ClinicalTrials.gov Identifier:	NCT00633009
Health Authority:	United States: Food and Drug Administration

Keywords provided by Allermed Laboratories, Inc.:

Leishmaniasis

Delayed-Type Hypersensitivity (DTH)

Skin Test

Conversion

Prior exposure to Leishmania major

Study placed in the following topic categories:

Leishmaniasis

Protozoan Infections

Skin Diseases, Infectious

Hypersensitivity

Hypersensitivity, Delayed

Skin Diseases

Parasitic Diseases

Leishmaniasis, Cutaneous

Additional relevant MeSH terms:

Skin Diseases, Parasitic

Sarcomastigophora Infections

Mastigophora Infections

ClinicalTrials.gov processed this record on September 05, 2008

Sponsors and Collaborators:	Allermed Laboratories, Inc. U.S. Army Medical Research and Materiel Command
Information provided by:	Allermed Laboratories, Inc.
ClinicalTrials.gov Identifier:	NCT00633009