Parasitic Infections of the Gastrointestinal Tract

This study is currently recruiting participants. (see Contacts and Locations)
Verified July 2015 by National Institutes of Health Clinical Center (CC)
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ) Identifier:
First received: November 3, 1999
Last updated: August 5, 2015
Last verified: July 2015

This protocol offers diagnosis and standard medical treatment for various parasitic gastrointestinal infections. Gastrointestinal parasites are either worms (helminths) or one-celled animals called protozoans which live in the human intestines. Often, parasitic infections do not cause illness. In these cases, drug treatment is not indicated, because treatment can have adverse side effects. Patients will be examined for their immune responses, correlation between the number of parasites and disease, and other studies.

Individuals with known or suspected parasitic diseases of the gastrointestinal tract, including amebiasis, giardiasis, hookworm, strongyloidiasis, trichuriasis, pinworm, tapeworm, trichinosis, clonorchis, opisthorchis, coccidiosis, paragonimiasis, and echinococcus may be eligible for this study.

Patient evaluations may include blood and urine tests, stool examination, X-rays, ultrasound studies and, uncommonly, duodenal aspiration for examination of fluid from the duodenum (first part of the small intestine). Other tests may be required, depending on the parasite and disease. Direct examination of the tissues of the intestines may be required to rule out certain infections.

Research procedures include collection of stool, blood and duodenal fluid when the diagnosis has been established and these procedures are not required for medical care. Patients with strongyloidiasis may also be given a diagnostic skin test similar to skin tests for tuberculosis and allergies. Research procedures on children will be limited to collection of stool, urine and blood. No more than 7 milliliters (1 1/2 teaspoons) per kilogram (2.2 pounds) body weight of blood will be collected in children over a 6-week period. In adults no more than 30 tablespoons of blood will be collected in a 6-week period.

Parasites may fail to respond to treatment. In these cases, it may be necessary to grow the parasite in the laboratory in order to test treatments in the test tube. Patients who do not respond to standard medications and dosing may need different doses of drugs or drugs or combinations of drugs used in the United States for other medical problems. If these medications or doses are used, patients will be informed of their possible side effects.

Parasitic Disease
Parasitic Intestinal Disease
Gastrointestinal Helminth Infections

Study Type: Observational
Study Design: Time Perspective: Prospective
Official Title: Study of Patients With Parasitic Infections of the Gastrointestinal Tract

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • To Collect and study different parasite populations to study and/or axenization of specific parasites, analyze immune responses to homologous or heterologous parasites, and the development of diagnostic tests [ Time Frame: Screening visit ] [ Designated as safety issue: No ]
  • Off label use of FDA approved drugs for treatment of Giardiasis in patients who cannot be cured otherwise, determining empirically which regimen is effective and safe [ Time Frame: Post Tx follow up visit ] [ Designated as safety issue: Yes ]

Estimated Enrollment: 200
Study Start Date: May 1977
Detailed Description:
The precis of this protocol is to allow the evaluation, treatment and study of patients with a variety of gastrointestinal parasites. This protocol primarily allows evaluation and treatment of patients with any intestinal parasite that requires a medical evaluation. The treatment and evaluation consists of standard of care. Research aspects include the collection and study of different parasite populations, analysis of the immune responses of the host, a correlation between parasite burden in the host and disease. These patients also serve as a source of reagents such as feces, white blood cells, and serum. The off-label use of FDA approved drugs is employed to treat symptomatic giardiasis in patients who cannot be cured otherwise and to determine empirically which regimens are effective and safe.

Ages Eligible for Study:   3 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Persons with proven or highly suspected parasitic infections involving the gastrointestinal tract (including amebiasis, giardiasis, hookworm, strongyloidiasis, trichuriasis, pinworm, tapeworm, cyclorsporiasis, cryptosporidia infections, microsporidia infections, isosporidium infections, trichinosis, gastrointestinal dwelling trematodes, coccdioiosis, and echinococccus and additional infections).

Persons older than 2.

Ability and willingness of the subject or legal guardian/representative to give written informed consent.


Subject unwilling or unable to comply with requirements of the protocol in the opinion of the investigator.

  Contacts and Locations
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, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00001162

Contact: Tamika S Magee, R.N. (301) 443-5458
Contact: Theodore E Nash, M.D. (301) 496-6920

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Patient Recruitment and Public Liaison Office (PRPL)    800-411-1222 ext TTY8664111010   
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
Principal Investigator: Theodore E Nash, M.D. National Institute of Allergy and Infectious Diseases (NIAID)
  More Information

Additional Information:
Responsible Party: National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ) Identifier: NCT00001162     History of Changes
Other Study ID Numbers: 770094  77-I-0094 
Study First Received: November 3, 1999
Last Updated: August 5, 2015
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Small Bowel Biopsy
E. Histolytica
Duodenal Aspiration
Parasitic Disease
Gastrointestinal Trematodes

Additional relevant MeSH terms:
Intestinal Diseases
Intestinal Diseases, Parasitic
Parasitic Diseases
Digestive System Diseases
Gastrointestinal Diseases
Parasitic Diseases, Animal
Protozoan Infections
Protozoan Infections, Animal processed this record on May 26, 2016