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Showing 1–24 of 212 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Protozoan Infections Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Merozoite Surface Protein 1 Antibody Response in Asymptomatic Human Malaria Infection

NCT00761020
View directory record Official record
Conditions
Malaria
Interventions
Mefloquine, Control
Drug · Other
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years to 55 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 18, 2021 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Study of the Safety of Intravenous Artesunate

NCT00292942
View directory record Official record
Conditions
Malaria, Malaria, Cerebral
Interventions
Intravenous Artesunate, Placebo
Drug
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years to 55 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 24, 2018 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Protecting Our Future Generation: Promotion of Protective Sexual Health Practices Among Native American Youth and Young Adults Through an Assets-based Self-care Intervention

NCT03895320
View directory record Official record
Conditions
Sexual Behavior, Unprotected Sex, Gonorrhea, Chlamydia, Trichomonas, Sexually Transmitted Diseases, Adolescent Behavior, Self Evaluation
Interventions
Sexual Health Risk Assessment, Sexual Health Score, Sexual Health Messaging, Water SSB Quiz, Water SSB Score, Water SSB Messaging, STI Screening
Behavioral
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
14 Years to 26 Years
Enrollment
219 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2022
U.S. locations
1
States / cities
Whiteriver, Arizona
Source: ClinicalTrials.gov public record
Updated Feb 22, 2024 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 1 Interventional

A Study of Letrazuril in the Treatment of AIDS-Related Diarrhea

NCT00001018
View directory record Official record
Conditions
Cryptosporidiosis, HIV Infections
Interventions
Letrazuril
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
13 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
4
States / cities
Los Angeles, California • New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Jul 22, 2026, 6:54 PM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Chloroquine (CQ) and Azithromycin (AZ) Combination for Malaria Prophylaxis

NCT03278808
View directory record Official record
Conditions
Malaria
Interventions
Chloroquine-Azithromycin (CQ/AZ), Chloroquine (CQ), atovaquone-proguanil (Malarone®)
Drug
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years to 50 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
2
States / cities
Bethesda, Maryland • Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 26, 2020 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Trial of an Adapted STD Screening and Risk Reduction Intervention

NCT02513225
View directory record Official record
Conditions
Alcohol Use, Drug Use, Diagnostic Self Evaluation, Gonorrhea, Unprotected Sex, Chlamydia, Trichomonas
Interventions
Project EMPWR, Optimized Standard Care (OSC)
Behavioral · Other
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
18 Years to 49 Years
Enrollment
350 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Fort Apache, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 26, 2023 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Trial of a Falciparum Malaria Protein (FMP012), E. Coli-expressed PfCelTOS, in Healthy Malaria-Naive Adults

NCT01540474
View directory record Official record
Conditions
Malaria
Interventions
Group 1: 10 ug FMP012 with 2 ug GLA-SE, Group 2: 10 ug FMP012 with 5 ug GLA-SE, 50 ug FMP012 with 5 ug GLA-SE or 2 ug GLA-SE, Controlled group-Challenged Only: no vaccination
Biological · Other
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years to 50 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 7, 2021 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Safer Sex Program for Young African-American Men

NCT01439503
View directory record Official record
Conditions
Gonorrhea, Chlamydia, Trichomoniasis, Syphilis, HIV Infections
Interventions
Intervention
Behavioral
Lead sponsor
Richard Crosby
Other
Eligibility
15 Years to 29 Years · Male only
Enrollment
620 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2018
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Feb 20, 2019 · Synced Jul 22, 2026, 6:54 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Collection of Human Biospecimens for Basic and Clinical Research Into Globin Variants

NCT03937817
View directory record Official record
Conditions
Alpha and Beta Thalassemia, Sickle Cell Disease, Malaria, Human Physiology
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 70 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2029
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 8, 2026 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Dose Escalation PfSPZ-CVac

NCT03083847
View directory record Official record
Conditions
Malaria
Interventions
Chloroquine Phosphate, Pyrimethamine, Sanaria PfSPZ Challenge
Drug · Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 50 Years
Enrollment
55 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated May 31, 2021 · Synced Jul 22, 2026, 6:54 PM EDT
Completed No phase listed Observational Results available

Evaluation of CL Detect™ Rapid Test to Detect Cutaneous Leishmaniasis

NCT01865032
View directory record Official record
Conditions
Skin Diseases
Interventions
Not listed
Lead sponsor
U.S. Army Medical Research and Development Command
Federal
Eligibility
18 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 24, 2026 · Synced Jul 22, 2026, 6:54 PM EDT
Terminated No phase listed Observational

Parasitic Infections of the Gastrointestinal Tract

NCT00001162
View directory record Official record
Conditions
Amebiasis, Cryptosporidiosis, Giardiasis, Parasitic Disease, Parasitic Intestinal Disease, Gastrointestinal Helminth Infections
Interventions
Not listed
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
3 Years and older
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1977 – 2017
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Jul 22, 2026, 6:54 PM EDT
Enrolling by invitation No phase listed Observational

Xpert® Tropical Fever Test on GeneXpert® Edge X System

NCT07520279
View directory record Official record
Conditions
Malaria Fever, Zika, Dengue Fever, Leptospirosis, Chikungunya Virus Infection
Interventions
Xpert Tropical Fever test
Diagnostic Test
Lead sponsor
Cepheid
Industry
Eligibility
14 Years and older
Enrollment
2,500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Apr 8, 2026 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Zinc Supplementation to Reduce Diarrhea Rates in Adults in Western Kenya.

NCT01166815
View directory record Official record
Conditions
Diarrhea, Malaria
Interventions
Zinc sulphate, Placebo
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 55 Years
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2008
U.S. locations
2
States / cities
Natick, Massachusetts • Grand Forks, North Dakota
Source: ClinicalTrials.gov public record
Updated Jul 21, 2010 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Not applicable Interventional

A Pilot Study of Oral Clindamycin and Pyrimethamine for the Treatment of Toxoplasmic Encephalitis in Patients With AIDS

NCT00000674
View directory record Official record
Conditions
Toxoplasmosis, Cerebral, HIV Infections
Interventions
Pyrimethamine, Leucovorin calcium, Clindamycin
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
13 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Ends 1992
U.S. locations
13
States / cities
Los Angeles, California • Palo Alto, California • San Diego, California + 8 more
Source: ClinicalTrials.gov public record
Updated May 17, 2012 · Synced Jul 22, 2026, 6:54 PM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

CS DNA MVA Trial in Mampong, Ghana

NCT00377494
View directory record Official record
Conditions
Plasmodium Falciparum Malaria
Interventions
MVA-CSO Vaccine, PfCSP DNA (VCL-2510) Vaccine
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 50 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
Ends 2008
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 22, 2019 · Synced Jul 22, 2026, 6:54 PM EDT
Recruiting Phase 2 Interventional

Oral Tafenoquine Plus Standard of Care Versus Placebo Plus Standard of Care for Babesiosis

NCT06207370
View directory record Official record
Conditions
Babesiosis
Interventions
Tafenoquine, Placebo
Drug · Other
Lead sponsor
60 Degrees Pharmaceuticals LLC
Industry
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 20, 2025 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Validity of Patient-Collected Wet Mounts

NCT02641717
View directory record Official record
Conditions
Vaginal Discharge, Trichomonas, Candidiasis, Vaginosis, Bacterial, Vaginitis
Interventions
vaginal swab
Other
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
18 Years and older · Female only
Enrollment
77 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Aug 25, 2016 · Synced Jul 22, 2026, 6:54 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Non-Invasive Sexually Transmitted Disease Testing in Women Seeking Emergency Contraception or Urine Pregnancy Testing

NCT00978848
View directory record Official record
Conditions
Trichomonas Vaginitis, Chlamydia Trachomatis, Neisseria Gonorrhoeae Infection
Interventions
Not listed
Lead sponsor
University of Pittsburgh
Other
Eligibility
15 Years and older · Female only
Enrollment
305 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 17, 2016 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 3 Interventional Results available

Trichomonas Vaginalis Repeat Infections Among HIV Negative Women

NCT01832480
View directory record Official record
Conditions
Vaginitis Trichomonal or Due to Trichomonas
Interventions
MTZ 500 mg twice daily x 7 days, MTZ 2 g
Drug
Lead sponsor
Tulane University Health Sciences Center
Other
Eligibility
18 Years and older · Female only
Enrollment
623 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
3
States / cities
Birmingham, Alabama • New Orleans, Louisiana • Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Feb 11, 2019 · Synced Jul 22, 2026, 6:54 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Cepheid Rectal Sample Validation Study

NCT02099760
View directory record Official record
Conditions
Gonorrhea, Chlamydia, Trichomonas
Interventions
STD testing (GC/Ct/trich)
Device
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
402 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 6, 2019 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Tafenoquine Thorough QTc Study in Healthy Subjects

NCT01928914
View directory record Official record
Conditions
Malaria, Vivax
Interventions
Tafenoquine 300mg, Tafenoquine 600mg, Tafenoquine 1200mg, moxifloxacin, Placebo for Tafenoquine, Placebo for moxifloxaxin
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 65 Years
Enrollment
260 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
2
States / cities
Culver City, California • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 11, 2017 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Not applicable Interventional

Azithromycin in the Treatment of Cryptosporidiosis in Patients Who Have Not Had Success With Other Drugs

NCT00002328
View directory record Official record
Conditions
Cryptosporidiosis, HIV Infections
Interventions
Azithromycin
Drug
Lead sponsor
Pfizer
Industry
Eligibility
1 Day and older
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Groton, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 23, 2005 · Synced Jul 22, 2026, 6:54 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety, Immunogenicity and Efficacy Against of a Combined Malaria Vaccine in Healthy Malaria-naïve Adults

NCT01366534
View directory record Official record
Conditions
Malaria
Interventions
Crucell's replication deficient adenovirus type 35 circumsporozoite malaria vaccine (Ad35.CS.01), GSK Biologicals' malaria vaccine 257049 (2 doses), GSK Biologicals' malaria vaccine 257049 (3 doses), Sporozoite challenge
Biological · Other
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 50 Years
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Silver Spring, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 17, 2019 · Synced Jul 22, 2026, 6:54 PM EDT