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Study of Patients With Strongyloides Stercoralis Infection

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. Identifier: NCT00001245
Recruitment Status : Completed
First Posted : November 4, 1999
Last Update Posted : August 25, 2009
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will explore faster and easier ways to detect infection with the intestinal parasite Strongyloides stercoralis and learn more about the conditions under which it causes serious disease. Ordinarily, the Strongyloides helminth (type of intestinal worm) causes only few, if any, symptoms, but in people with weakened immunity it may be very serious, and even deadly.

People between 5 and 80 years of age with known or suspected S. stercoralis infection, or infection with another helminth, such as filariasis, that might cause a cross-reaction with S. stercoralis may be eligible for this study.

Participants found to be infected with S. stercoralis will be treated with ivermectin, thiabendazole, or albendazole. In addition, they will undergo the following tests and procedures:

  • Blood tests and stool samples: Samples will be collected before and after treatment to check general health status and immune function, and to look for parasites in stool. Up to 50 milliliters (10 teaspoons) of blood will be drawn in adults and up to 25 ml (5 teaspoons) in children.
  • Skin tests: A test similar to those used for tuberculosis and allergies will be conducted to determine if there is sensitization to products of the parasite. Such a test might be used as a rapid method to diagnose the infection. About three drops of several different antigens (proteins) are injected into the skin of the arm. After 15 to 20 minutes, the area is checked to see if a red spot has formed and, if so, the spot is measured.

Condition or disease
HIV Infection Nematode Infection Strongyloidiasis

Detailed Description:
This study is directed to patients with known or suspected Strongyloides stercoralis infection because it is a relatively common parasitic infection, even in the United States. It is difficult to diagnose, and efficacy of treatment is difficult to evaluate. Some infected individuals can develop serious even fatal, disease under certain conditions of immunosuppression. Because newer diagnostic methods are needed to diagnose this infection, we have developed new diagnostics that will be evaluated in comparison to more standard diagnostic tests. Serum and cells will also be collected from patients on this protocol to understand the cellular and humoral response to the parasite and its antigens. All subjects proven to have Strongyloides stercoralis infection will be treated with standard therapy and followed to assess both the efficacy of treatment and the changes in humoral and cellular immune responses induced by treatment.

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Study Type : Observational
Enrollment : 650 participants
Official Title: Study of Patients With Known or Suspected Infection With Strongyloides Stercoralis
Study Start Date : August 1989
Actual Primary Completion Date : May 2009

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   8 Years to 80 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Age of 5 to 80 years and of either sex.

Access to primary medical care provider outside of the NIH

Ability to give written informed consent (for adults) and parental consent (for those under 18)

Presence of known or suspected infection with Stronglyloides stercoralis, such as significant peripheral blood eosinophilia (greater than 1000 eosinophils/mm(3)) for which no other cause is apparent.

Willingness to participate and provide blood for in vitro assays and serum storage.


Less than 5 years of age

Pregnancy is not a criterion for exclusion.

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 identifier (NCT number): NCT00001245

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United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)

Additional Information:
Layout table for additonal information Identifier: NCT00001245    
Other Study ID Numbers: 890174
First Posted: November 4, 1999    Key Record Dates
Last Update Posted: August 25, 2009
Last Verified: May 2009
Keywords provided by National Institutes of Health Clinical Center (CC):
Immediate Hypersensitivity Skin Test
Skin Test
Intestinal Helminth
Immediate Hypersensitivity
Additional relevant MeSH terms:
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Communicable Diseases
Nematode Infections
Rhabditida Infections
Secernentea Infections
Parasitic Diseases