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Clinical Study to Assess the Efficacy of IMM-124E (Travelan®) in a Controlled Human Infection Model

Primary Purpose

Diarrhea, Travelers Diarrhea, Infectious Diarrhea

Status
Recruiting
Phase
Phase 2
Locations
United States
Study Type
Interventional
Intervention
Travelan
Placebo
Sponsored by
Immuron Ltd.
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional prevention trial for Diarrhea focused on measuring Enterotoxigenic E.coli, Travelers diarrhea, prophylactic, ETEC, IMM-124E, Travelan

Eligibility Criteria

18 Years - 50 Years (Adult)All SexesAccepts Healthy Volunteers

Inclusion Criteria: Male or female between 18 and 50 years of age, inclusive at time of screening visit. General good health, without significant medical illness, abnormal vital signs or physical examination findings, or clinical laboratory abnormalities, as determined by the principal investigator (PI) in consultation with the Medical Monitor and Sponsor. Demonstrate comprehension of the protocol procedures, requirements, and CHIM this will be evaluated by completing a multiple choice comprehension assessment (passing grade > 70%) during screening and in the consenting process. Willing to participate, as evidenced by signing the informed consent document. Available for all planned follow-up visits. Negative serum pregnancy test at screening and negative serum and/or urine pregnancy test on the day of admittance to the inpatient unit for all female participants. All females must agree to use an efficacious hormonal or barrier method of birth control during the study. Efficacious methods of birth control include hormonal birth control methods (oral contraceptive pills, patches, vaginal rings, long-acting reversible contraception, surgical sterilization, condoms with spermicide, or abstinence from intercourse with a male partner. Female participants unable to bear children must have this documented (e.g., tubal ligation or hysterectomy). A negative Covid-19 PCR test is required on the day of admission to the unit to comply with Pharmaron's Covid-19 policy (subjects reporting to admission for Cohort 1 who test positive for COVID-19 may rescreen for Cohort 2) Acceptable hematology and blood chemistry levels as assessed by the PI. i.e., Serum creatinine <1.3 mg/dL. AST, GGT, amylase, lipase, alkaline phosphatase not to exceed 1.5x upper limit of normal (ULN) Vital signs will be assessed in the supine position and must be within the following ranges: Oral body temperature between 35-37oC inclusive Systolic blood pressure between 90-140 mmHg inclusive Diastolic blood pressure between 55-90 mmHg inclusive Pulse rate between 45-90 bpm inclusive Exclusion Criteria: Presence of a significant medical condition (e.g., psychiatric conditions such as significant anxiety, depression, or somatization disorder; gastrointestinal disease, such as peptic ulcer, symptoms or evidence of active gastritis/dyspepsia, gastroesophageal reflux disease, inflammatory bowel disease, or irritable bowel syndrome (as suggested by medical history or medical diagnosis); history of major gastrointestinal surgery; or laboratory abnormalities that in the opinion of the investigator preclude participation in the study. Significant medical conditions include HIV, active Hepatitis B or C infection, ongoing immunosuppression for any reason, autoimmune disease, any underlying cardiac, pulmonary, endocrine, or renal conditions, any gastrointestinal illness (chronic reflux, inflammatory bowel disease, ulcer), any diabetes mellitus, and other such illnesses that can put a volunteer at increased risk. Exclusionary laboratory abnormalities include any abnormality that is grade 2 or above, or any two grade 1 laboratory abnormalities. Immunosuppressive illness or evidence of IgA deficiency (serum IgA levels outside the normal range). This includes any disease that requires immunosuppressive medication such corticosteroids, monoclonal antibodies that target key aspects of the immune system (e.g. rituximab or TNF-blockers, or any autoimmune disease). Positive serology results for HIV, HBsAg, or HCV antibodies, and confirmatory tests if appropriate. Positive urine drug screen (positive for the presence of amphetamines, barbiturates, opiates, phencyclidine, cocaine, benzodiazepines, methadone, and propoxyphene at screening and at the discretion of the study physician, with the exception of stable persons with a diagnosis of ADHD that is well-controlled with a prescribed amphetamine. History of alcohol abuse in the past 3 months or drug abuse in the past year Significant abnormalities in screening laboratory hematology, serum chemistry or electrocardiogram, as determined by the PI or PI in consultation with the Medical Monitor and Sponsor. Significant ECG abnormalities include the following: PR > 220 msec QRS complex > 120 msec QTcF > 450 msec (male) or >460 msec (female) Serum bilirubin exceeds upper limit of normal Use of any medication known to affect immune function (e.g., corticosteroids and others) within 30 days preceding receipt of the investigational products or planned to be used during the active study period. Any regular systemic corticosteroid will be exclusionary, while topical, intranasal, and inhaled steroids will be permitted. Nursing or lactating on the day of admittance to the inpatient unit. Inability to tolerate 150 ml of sodium bicarbonate buffer. Recent vaccination (including licensed vaccines) or receipt of an investigational product (within 30 days before challenge through 30 days following the challenge dose). History of diarrhea (> 3 unformed or liquid stools over a 24-hour period) in the 2 weeks prior to the planned inpatient phase. Fewer than 3 stools per week or more than 3 stools per day as the usual frequency, or loose or liquid stools other than on an occasional basis. Regular use of laxatives or any agent that increases gastric pH (regular defined as at least weekly). Use of proton pump inhibitors, H2 blockers, or antacids within 48 hours of dosing. A fever (≥38.0°C) in the 2 weeks prior to time of challenge. Use of antibiotics during the 30 days before bacterial dosing or receipt of more than 3 courses of antibiotics over the two months prior to dosing. Blood or plasma donation of one pint or more within 30 days preceding the receipt of the investigational products. Lactose intolerance or allergy to milk or milk products. Employment as a health care worker, food handler, childcare worker, or caregivers for elderly or immunocompromised individuals. Allergy to fluoroquinolones, trimethoprim-sulfamethoxazole, doxycycline, or ampicillin/penicillin (excluded if allergic to two of four). History of microbiologically confirmed ETEC infection in the last 3 years. Occupation involving handling of ETEC currently, or in the past 3 years. Symptoms consistent with travelers' diarrhea defined as >3 unformed or liquid stools over a 24 hour period concurrent with travel to countries where ETEC infection is endemic (most of the developing world) within 3 years prior to dosing, OR planned travel to endemic countries during the length of the study. ETEC endemic countries include all countries in Asia (except for Japan and South Korea) the Middle East, Africa, Mexico, Central and South America. Vaccination for or ingestion of ETEC, cholera, Shigella, or E. coli heat-labile toxin within 5 years prior to dosing. Any prior experimental infection with ETEC strain H10407, or prior experimental infection with other ETEC strains or other bacterial enteric pathogens (Salmonella, Shigella, and Campylobacter) within the past 5 years.

Sites / Locations

  • Pharmaron Clinical Pharmacology CenterRecruiting

Arms of the Study

Arm 1

Arm 2

Arm Type

Active Comparator

Placebo Comparator

Arm Label

Travelan

Placebo

Arm Description

IMM-124E (Travelan) is the investigational product. Travelan 1200mg will be taken orally for 7 days.

ProMilk 85 milk powder is the placebo. Placebo has been manufactured into tablets using the same manufacturing process as Travelan. 1200mg will be taken orally for 7 days.

Outcomes

Primary Outcome Measures

To measure the protective efficacy of oral administration of Travelan compared to placebo against moderate-to-severe diarrhea following with E.coli (ETEC) challenge.
The number of subjects who encounter moderate to severe diarrhea (defined as ≥4 Grade 3-5 stools in any 24-hour period post-challenge or ≥401 grams of Grade 3-5 stools in any 24-hour period post-challenge) will be recorded for the Travelan group and the placebo group. All stool samples will be collected, weighed and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea (Grade 3-5 stools) severity in a 24 hour period (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).

Secondary Outcome Measures

Measurement of the highest output of loose/liquid stools (in grams) in any 24-hour period (grade 3-5 stools) post ETEC challenge for the Travelan group and the placebo group.
All stools post challenge (Day 1-8 or Day of dismissal from the inpatient unit) will be collected, weighed (1g = 1ml) and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period post-challenge (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Measurement of diarrheal output of the total amount of loose stool (grade 3-5) post ETEC challenge for the Travelan group and the placebo group
All stools post challenge (Day 1-8 or Day of dismissal from the inpatient unit) will be collected, weighed in grams (1g = 1ml) and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period post-challenge (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g). Diarrhea severity (Grade 3-5 stools) in a 24 hour period (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Percent of subjects with severe diarrhea post ETEC challenge for the Travelan group and the placebo group
Severe diarrhea defined as 6 or more loose liquid stools in a 24 hour period totaling >800g. (1g = 1ml). All stools will be collected, weighed (1g = 1ml) and graded. Stool Grading Scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period post-challenge (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Percent of subjects with diarrhea (Grade 3-5) of any severity post ETEC challenge for the Travelan group and the placebo group
All stools will be collected, weighed (1g = 1ml) and graded. Stool will be graded based on a standard stool grading scale as follows: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period: 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Safety and tolerability of oral doses of Travelan compared to placebo. Measurement ofthe number of AEs graded as moderate-to-severe (Grade 2-4) for Diarrhea, fever, vomiting and other listed AEs as assessed using the CTCAE v5.0 criteria for AEs.
All AEs will be recorded for the Travelan group and the placebo group using the following criteria (1-4): 1. Diarrhea severity (Grade 3-5 stools) in a 24 hour period (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g). 2. Temperature maximum measured in a 24 hr period: no fever (<38.0°C), 1-mild (38.0-38.4°C), 2-moderate (38.5-38.9°C), 3-severe (>39.0°C); 4-Potentially life threatening (>40oC). 3. Vomiting in a 24 hr period: 0-no episodes, 1-mild (1-2 episodes), 2-moderate (2-3 episodes), or 3-severe (>5 episodes). 4. Nausea, abdominal discomfort and pain, abdominal cramps, headache, malaise or anorexia graded as follows: 0-Non-existent, 1 -mild (not interfering with routine activities), 2 -moderate (interfering but not precluding routine activities), 3 -severe (precluding routine activities), 4 - potentially life threatening (requires hospitalization)
Percent of subjects post ETEC challenge with reduced daily activity for the Travelan group and the placebo group
Measurement of the percentage of subjects post challenge who indicate they would have reduced their daily activity if they had been vacationing or traveling for business because of their ETEC illness. Monitoring will once occur daily from Day 1 - Day 8 or the day of dismissal from the inpatient facility for all subjects.
Number of subjects requiring early antibiotic treatment post ETEC challenge for the Travelan group and the placebo group
Measurement of the number of subjects who require early antibiotic treatment prior to study day 6 post challenge. Numbers will be monitored daily from Day 1-5 and expressed as a percentage of the Travelan or placebo group.
Subjects requiring oral rehydration solution and/or intravenous fluids post ETEC challenge for the Travelan group and the placebo group
Measurement of the number of subjects who require oral rehydration solution and/or intravenous fluids on one or more days post challenge. Numbers will be monitored daily and expressed as a percentage of the Travelan or placebo group.
Time to diarrhea onset and diarrhea resolution post ETEC challenge for the Travelan group and the placebo group.
Measurement of the time (days, hours and minutes) after ETEC challenge to diarrheal onset (Stool Grade 3-5) and resolution (Stool Grade 1-2). All stools will be collected weighed (1g = 1ml) and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period: 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Density of ETEC organisms in post-challenge stool samples at 48 hours post ETEC challenge for the Travelan group and the placebo group
The number of colony forming units (CFUs) of ETEC challenge strain measured by quantitative bacterial stool culture 48 hours post challenge per gram of stool (1g = 1ml).
ETEC disease severity score to measure objective signs and symptoms of malaise, abdominal cramps, headache, lightheadedness, vomiting, diarrhea, fever measured post ETEC challenge for the Travelan group and the placebo group.
Measurement for individual subjects and compared by group. Symptom severity is based on the maximum observed severity during the course of the infection using severity scales 1-4: 1. Malaise, abdominal cramps, headache and lightheadedness severity: 0 -non-existent, 1 -mild (not interfering with routine activities), 2 -moderate (interfering but not precluding routine activities) or 3 -severe (precluding routine activities) 2. Vomiting severity: 0-no vomiting (0 episodes), 1-mild (1-2 episodes), 2-moderate (2-3 episodes), or 3-severe (>5 episodes). 3. Fever severity: no fever (<38.0°C), 1-mild (38.0-38.4°C), 2-moderate (38.5-38.9°C), 3-severe (≥39.0°C) 4-Potentially life threatening (>40oC). 4. Diarrhea severity (Grade 3-5 stools) where 1g = 1ml: 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).

Full Information

First Posted
May 26, 2023
Last Updated
August 1, 2023
Sponsor
Immuron Ltd.
Collaborators
United States Department of Defense, Naval Medical Research Center
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1. Study Identification

Unique Protocol Identification Number
NCT05933525
Brief Title
Clinical Study to Assess the Efficacy of IMM-124E (Travelan®) in a Controlled Human Infection Model
Official Title
A Randomized, Double-blind, Placebo-controlled Trial Assessing the Efficacy of IMM-124E (Travelan®) in a Controlled Human Infection Model for Enterotoxigenic Escherichia Coli (ETEC)
Study Type
Interventional

2. Study Status

Record Verification Date
August 2023
Overall Recruitment Status
Recruiting
Study Start Date
May 29, 2023 (Actual)
Primary Completion Date
December 2023 (Anticipated)
Study Completion Date
April 2024 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
Immuron Ltd.
Collaborators
United States Department of Defense, Naval Medical Research Center

4. Oversight

Studies a U.S. FDA-regulated Drug Product
Yes
Studies a U.S. FDA-regulated Device Product
No
Product Manufactured in and Exported from the U.S.
No
Data Monitoring Committee
Yes

5. Study Description

Brief Summary
This is a randomized, double-blind, placebo-controlled study to investigate if Travelan® protects healthy adult volunteers from moderate-to-severe diarrhea upon challenge with Enterotoxigenic Escherichia coli (ETEC) strain H10407.
Detailed Description
Up to 60 subjects will be randomized to receive either the Travelan® product or a placebo followed by challenge with ETEC strain H10407. Subjects will receive Travelan® or placebo caplets beginning 2 days prior to experimental challenge with ETEC strain H10407. Travelan®/placebo will be administered for a total of 7 days, or until antibiotic treatment has been initiated. Antibiotic treatment will be initiated after early antibiotic treatment criteria are met or 5 days after challenge. Early antibiotic treatment will commence when any of the following criteria are met and a physician determines it to be warranted: Severe diarrhea based on volume (800 g in 24 hours) Diarrhea of any severity AND 2 or more of the following symptoms: severe abdominal pain, severe abdominal cramps, severe nausea, severe headache, severe myalgias, severe arthralgia), any fever (≥ 38.0°C), or any vomiting Any fever ≥ 39.0°C Subjects who experience unexpectedly severe events such as symptomatic hypotension (disproportionate to volume loss), renal dysfunction, or altered mental state at the discretion of the investigators. A study physician determines that early treatment is warranted for other reasons. The placebo is a commercially-sourced high-protein milk product repackaged and masked to mirror the Travelan® product. Upon admission to the inpatient unit, clinical monitoring will consist of daily medical assessments with adverse event (AE) determination, vital signs at least three times daily, examination and weighing of all stools, stool culture work-up for the challenge strain up to three times daily, and safety laboratory tests. Any subject passing a grade 3-5 stool will be encouraged to start drinking oral fluids at a rate equal to 1.5 times their stool output (or at the same rate as their emesis output as applicable). Intravenous (IV) rehydration will be provided if pre-specified criteria are met. All subjects will be treated with ciprofloxacin (500 mg by mouth twice daily for three days) or other antibiotic where applicable starting five days after ingesting the H10407 challenge inoculum unless early treatment criteria are met. Subjects will be discharged from the inpatient facility when clinical symptoms are resolved or resolving and two consecutive stool cultures (taken at least 12 hours apart) are negative for the ETEC challenge strain. Subjects may be discharged earlier than Day 8 if they meet criteria.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Diarrhea, Travelers Diarrhea, Infectious Diarrhea
Keywords
Enterotoxigenic E.coli, Travelers diarrhea, prophylactic, ETEC, IMM-124E, Travelan

7. Study Design

Primary Purpose
Prevention
Study Phase
Phase 2
Interventional Study Model
Parallel Assignment
Model Description
60 healthy volunteer participants will be randomized to receive Travelan investigational product or placebo. The study is a double-blind randomized study.
Masking
ParticipantCare ProviderInvestigatorOutcomes Assessor
Masking Description
Consenting, eligible participants will be randomized in a 1:1 ratio to receive either the test article Travelan® or placebo. Once enrolled into the study (subject meets all eligibility criteria and is selected by the investigator for inclusion in the study), subjects will be assigned a randomization number. The subject will receive the study treatment regimen assigned to the corresponding randomization number. Subjects will receive the test article/placebo in containers bearing their assigned identification numbers. This number will be linked to the randomization code list securely maintained throughout the clinical phase of the study by the designated study staff. Investigators and participants will remain blinded to group assignments until completion of the clinical phase of the trial and validation of the clinical and immunological data.
Allocation
Randomized
Enrollment
60 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
Travelan
Arm Type
Active Comparator
Arm Description
IMM-124E (Travelan) is the investigational product. Travelan 1200mg will be taken orally for 7 days.
Arm Title
Placebo
Arm Type
Placebo Comparator
Arm Description
ProMilk 85 milk powder is the placebo. Placebo has been manufactured into tablets using the same manufacturing process as Travelan. 1200mg will be taken orally for 7 days.
Intervention Type
Biological
Intervention Name(s)
Travelan
Other Intervention Name(s)
IMM-124E
Intervention Description
6 Travelan tablets (1200mg) administered orally for 7 days
Intervention Type
Other
Intervention Name(s)
Placebo
Other Intervention Name(s)
ProMilk 85 milk powder
Intervention Description
6 tablets of placebo (1200mg) administered orally for 7 days
Primary Outcome Measure Information:
Title
To measure the protective efficacy of oral administration of Travelan compared to placebo against moderate-to-severe diarrhea following with E.coli (ETEC) challenge.
Description
The number of subjects who encounter moderate to severe diarrhea (defined as ≥4 Grade 3-5 stools in any 24-hour period post-challenge or ≥401 grams of Grade 3-5 stools in any 24-hour period post-challenge) will be recorded for the Travelan group and the placebo group. All stool samples will be collected, weighed and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea (Grade 3-5 stools) severity in a 24 hour period (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring for the Inpatient Study Phase, Study Days -3 to Day 8 or day of dismissal from the clinical trial facility
Secondary Outcome Measure Information:
Title
Measurement of the highest output of loose/liquid stools (in grams) in any 24-hour period (grade 3-5 stools) post ETEC challenge for the Travelan group and the placebo group.
Description
All stools post challenge (Day 1-8 or Day of dismissal from the inpatient unit) will be collected, weighed (1g = 1ml) and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period post-challenge (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility
Title
Measurement of diarrheal output of the total amount of loose stool (grade 3-5) post ETEC challenge for the Travelan group and the placebo group
Description
All stools post challenge (Day 1-8 or Day of dismissal from the inpatient unit) will be collected, weighed in grams (1g = 1ml) and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period post-challenge (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g). Diarrhea severity (Grade 3-5 stools) in a 24 hour period (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility
Title
Percent of subjects with severe diarrhea post ETEC challenge for the Travelan group and the placebo group
Description
Severe diarrhea defined as 6 or more loose liquid stools in a 24 hour period totaling >800g. (1g = 1ml). All stools will be collected, weighed (1g = 1ml) and graded. Stool Grading Scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period post-challenge (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility
Title
Percent of subjects with diarrhea (Grade 3-5) of any severity post ETEC challenge for the Travelan group and the placebo group
Description
All stools will be collected, weighed (1g = 1ml) and graded. Stool will be graded based on a standard stool grading scale as follows: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period: 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility
Title
Safety and tolerability of oral doses of Travelan compared to placebo. Measurement ofthe number of AEs graded as moderate-to-severe (Grade 2-4) for Diarrhea, fever, vomiting and other listed AEs as assessed using the CTCAE v5.0 criteria for AEs.
Description
All AEs will be recorded for the Travelan group and the placebo group using the following criteria (1-4): 1. Diarrhea severity (Grade 3-5 stools) in a 24 hour period (1g = 1ml): 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g). 2. Temperature maximum measured in a 24 hr period: no fever (<38.0°C), 1-mild (38.0-38.4°C), 2-moderate (38.5-38.9°C), 3-severe (>39.0°C); 4-Potentially life threatening (>40oC). 3. Vomiting in a 24 hr period: 0-no episodes, 1-mild (1-2 episodes), 2-moderate (2-3 episodes), or 3-severe (>5 episodes). 4. Nausea, abdominal discomfort and pain, abdominal cramps, headache, malaise or anorexia graded as follows: 0-Non-existent, 1 -mild (not interfering with routine activities), 2 -moderate (interfering but not precluding routine activities), 3 -severe (precluding routine activities), 4 - potentially life threatening (requires hospitalization)
Time Frame
Monitoring for the inpatient study phase: Study Days -3 to Day 8 or day of dismissal from the clinical trial facility.
Title
Percent of subjects post ETEC challenge with reduced daily activity for the Travelan group and the placebo group
Description
Measurement of the percentage of subjects post challenge who indicate they would have reduced their daily activity if they had been vacationing or traveling for business because of their ETEC illness. Monitoring will once occur daily from Day 1 - Day 8 or the day of dismissal from the inpatient facility for all subjects.
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility
Title
Number of subjects requiring early antibiotic treatment post ETEC challenge for the Travelan group and the placebo group
Description
Measurement of the number of subjects who require early antibiotic treatment prior to study day 6 post challenge. Numbers will be monitored daily from Day 1-5 and expressed as a percentage of the Travelan or placebo group.
Time Frame
Monitoring post-challenge for Study Days 1-5
Title
Subjects requiring oral rehydration solution and/or intravenous fluids post ETEC challenge for the Travelan group and the placebo group
Description
Measurement of the number of subjects who require oral rehydration solution and/or intravenous fluids on one or more days post challenge. Numbers will be monitored daily and expressed as a percentage of the Travelan or placebo group.
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility.
Title
Time to diarrhea onset and diarrhea resolution post ETEC challenge for the Travelan group and the placebo group.
Description
Measurement of the time (days, hours and minutes) after ETEC challenge to diarrheal onset (Stool Grade 3-5) and resolution (Stool Grade 1-2). All stools will be collected weighed (1g = 1ml) and graded. Stool grading scale: Grade 1 = Fully formed (normal) Grade 2 = Soft (normal) Grade 3 = Thick liquid (diarrheal) Grade 4 = Opaque watery (diarrheal) Grade 5 = Rice-water (diarrheal). Diarrhea severity (Grade 3-5 stools) in a 24 hour period: 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility.
Title
Density of ETEC organisms in post-challenge stool samples at 48 hours post ETEC challenge for the Travelan group and the placebo group
Description
The number of colony forming units (CFUs) of ETEC challenge strain measured by quantitative bacterial stool culture 48 hours post challenge per gram of stool (1g = 1ml).
Time Frame
Monitoring on Study Day 3 or 48 hours post challenge
Title
ETEC disease severity score to measure objective signs and symptoms of malaise, abdominal cramps, headache, lightheadedness, vomiting, diarrhea, fever measured post ETEC challenge for the Travelan group and the placebo group.
Description
Measurement for individual subjects and compared by group. Symptom severity is based on the maximum observed severity during the course of the infection using severity scales 1-4: 1. Malaise, abdominal cramps, headache and lightheadedness severity: 0 -non-existent, 1 -mild (not interfering with routine activities), 2 -moderate (interfering but not precluding routine activities) or 3 -severe (precluding routine activities) 2. Vomiting severity: 0-no vomiting (0 episodes), 1-mild (1-2 episodes), 2-moderate (2-3 episodes), or 3-severe (>5 episodes). 3. Fever severity: no fever (<38.0°C), 1-mild (38.0-38.4°C), 2-moderate (38.5-38.9°C), 3-severe (≥39.0°C) 4-Potentially life threatening (>40oC). 4. Diarrhea severity (Grade 3-5 stools) where 1g = 1ml: 1-mild (2-3 loose/liquid stool totaling <400 g), 2-moderate (4 to 5 loose/liquid stools or >401 to 800 g), 3-severe (6 or more loose/liquid stools totaling >800 g).
Time Frame
Monitoring post challenge on Study Days 1-8 or Day of dismissal from the clinical trial facility

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
50 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Male or female between 18 and 50 years of age, inclusive at time of screening visit. General good health, without significant medical illness, abnormal vital signs or physical examination findings, or clinical laboratory abnormalities, as determined by the principal investigator (PI) in consultation with the Medical Monitor and Sponsor. Demonstrate comprehension of the protocol procedures, requirements, and CHIM this will be evaluated by completing a multiple choice comprehension assessment (passing grade > 70%) during screening and in the consenting process. Willing to participate, as evidenced by signing the informed consent document. Available for all planned follow-up visits. Negative serum pregnancy test at screening and negative serum and/or urine pregnancy test on the day of admittance to the inpatient unit for all female participants. All females must agree to use an efficacious hormonal or barrier method of birth control during the study. Efficacious methods of birth control include hormonal birth control methods (oral contraceptive pills, patches, vaginal rings, long-acting reversible contraception, surgical sterilization, condoms with spermicide, or abstinence from intercourse with a male partner. Female participants unable to bear children must have this documented (e.g., tubal ligation or hysterectomy). A negative Covid-19 PCR test is required on the day of admission to the unit to comply with Pharmaron's Covid-19 policy (subjects reporting to admission for Cohort 1 who test positive for COVID-19 may rescreen for Cohort 2) Acceptable hematology and blood chemistry levels as assessed by the PI. i.e., Serum creatinine <1.3 mg/dL. AST, GGT, amylase, lipase, alkaline phosphatase not to exceed 1.5x upper limit of normal (ULN) Vital signs will be assessed in the supine position and must be within the following ranges: Oral body temperature between 35-37oC inclusive Systolic blood pressure between 90-140 mmHg inclusive Diastolic blood pressure between 55-90 mmHg inclusive Pulse rate between 45-90 bpm inclusive Exclusion Criteria: Presence of a significant medical condition (e.g., psychiatric conditions such as significant anxiety, depression, or somatization disorder; gastrointestinal disease, such as peptic ulcer, symptoms or evidence of active gastritis/dyspepsia, gastroesophageal reflux disease, inflammatory bowel disease, or irritable bowel syndrome (as suggested by medical history or medical diagnosis); history of major gastrointestinal surgery; or laboratory abnormalities that in the opinion of the investigator preclude participation in the study. Significant medical conditions include HIV, active Hepatitis B or C infection, ongoing immunosuppression for any reason, autoimmune disease, any underlying cardiac, pulmonary, endocrine, or renal conditions, any gastrointestinal illness (chronic reflux, inflammatory bowel disease, ulcer), any diabetes mellitus, and other such illnesses that can put a volunteer at increased risk. Exclusionary laboratory abnormalities include any abnormality that is grade 2 or above, or any two grade 1 laboratory abnormalities. Immunosuppressive illness or evidence of IgA deficiency (serum IgA levels outside the normal range). This includes any disease that requires immunosuppressive medication such corticosteroids, monoclonal antibodies that target key aspects of the immune system (e.g. rituximab or TNF-blockers, or any autoimmune disease). Positive serology results for HIV, HBsAg, or HCV antibodies, and confirmatory tests if appropriate. Positive urine drug screen (positive for the presence of amphetamines, barbiturates, opiates, phencyclidine, cocaine, benzodiazepines, methadone, and propoxyphene at screening and at the discretion of the study physician, with the exception of stable persons with a diagnosis of ADHD that is well-controlled with a prescribed amphetamine. History of alcohol abuse in the past 3 months or drug abuse in the past year Significant abnormalities in screening laboratory hematology, serum chemistry or electrocardiogram, as determined by the PI or PI in consultation with the Medical Monitor and Sponsor. Significant ECG abnormalities include the following: PR > 220 msec QRS complex > 120 msec QTcF > 450 msec (male) or >460 msec (female) Serum bilirubin exceeds upper limit of normal Use of any medication known to affect immune function (e.g., corticosteroids and others) within 30 days preceding receipt of the investigational products or planned to be used during the active study period. Any regular systemic corticosteroid will be exclusionary, while topical, intranasal, and inhaled steroids will be permitted. Nursing or lactating on the day of admittance to the inpatient unit. Inability to tolerate 150 ml of sodium bicarbonate buffer. Recent vaccination (including licensed vaccines) or receipt of an investigational product (within 30 days before challenge through 30 days following the challenge dose). History of diarrhea (> 3 unformed or liquid stools over a 24-hour period) in the 2 weeks prior to the planned inpatient phase. Fewer than 3 stools per week or more than 3 stools per day as the usual frequency, or loose or liquid stools other than on an occasional basis. Regular use of laxatives or any agent that increases gastric pH (regular defined as at least weekly). Use of proton pump inhibitors, H2 blockers, or antacids within 48 hours of dosing. A fever (≥38.0°C) in the 2 weeks prior to time of challenge. Use of antibiotics during the 30 days before bacterial dosing or receipt of more than 3 courses of antibiotics over the two months prior to dosing. Blood or plasma donation of one pint or more within 30 days preceding the receipt of the investigational products. Lactose intolerance or allergy to milk or milk products. Employment as a health care worker, food handler, childcare worker, or caregivers for elderly or immunocompromised individuals. Allergy to fluoroquinolones, trimethoprim-sulfamethoxazole, doxycycline, or ampicillin/penicillin (excluded if allergic to two of four). History of microbiologically confirmed ETEC infection in the last 3 years. Occupation involving handling of ETEC currently, or in the past 3 years. Symptoms consistent with travelers' diarrhea defined as >3 unformed or liquid stools over a 24 hour period concurrent with travel to countries where ETEC infection is endemic (most of the developing world) within 3 years prior to dosing, OR planned travel to endemic countries during the length of the study. ETEC endemic countries include all countries in Asia (except for Japan and South Korea) the Middle East, Africa, Mexico, Central and South America. Vaccination for or ingestion of ETEC, cholera, Shigella, or E. coli heat-labile toxin within 5 years prior to dosing. Any prior experimental infection with ETEC strain H10407, or prior experimental infection with other ETEC strains or other bacterial enteric pathogens (Salmonella, Shigella, and Campylobacter) within the past 5 years.
Central Contact Person:
First Name & Middle Initial & Last Name or Official Title & Degree
Jerry Kanellos, PhD
Phone
+61388924882
Email
Jerry@immuron.com
First Name & Middle Initial & Last Name or Official Title & Degree
Joanne L Casey, PhD
Phone
+613413296547
Email
joanne@immuron.com
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Mohamed Al-Ibrahim, MB,ChB,FACP
Organizational Affiliation
Pharmaron Clinical Pharmacology Center
Official's Role
Principal Investigator
Facility Information:
Facility Name
Pharmaron Clinical Pharmacology Center
City
Baltimore
State/Province
Maryland
ZIP/Postal Code
21201
Country
United States
Individual Site Status
Recruiting
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Mohamed Al-Ibrahim, MB,ChB,FACP
Phone
410-245-6888
Email
mohamed.al-ibrahim@pharmaron.com
First Name & Middle Initial & Last Name & Degree
Kaelyn Taylor, BSc
Phone
2406730500
Ext
1741
Email
kaelyn.taylor@pharmaron.com

12. IPD Sharing Statement

Plan to Share IPD
No

Learn more about this trial

Clinical Study to Assess the Efficacy of IMM-124E (Travelan®) in a Controlled Human Infection Model

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