Study of Efficacy and Safety of ABO809 in Healthy Participants

June 27, 2024 updated by: Novartis Pharmaceuticals

An Open Label Cryptosporidium Controlled Human Infection Model (CHIM) to Assess the Efficacy and Safety of ABO809 in Healthy Participants

The purpose of this Phase I controlled human infection model (CHIM) study was to determine if oral administration of a good manufacturing practice (GMP) supply of Cryptosporidium parvum oocysts (ABO809) to healthy volunteers resulted in a Cryptosporidium infection and diarrheal illness. The study measured fecal oocysts (parasitological endpoint) as well as diarrhea and associated signs and symptoms (clinical endpoint).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This study was funded by the Wellcome Trust. This Phase 1 Cryptosporidium controlled human infection model (CHIM) study employed a single-center, open-label design to characterize the incidence of infection and associated symptoms following the administration of single doses of Cryptosporidium parvum oocysts (CE).

Healthy volunteers were enrolled in cohorts of approximately 10 participants who received ABO809 on the same day (Day 1). The study consisted of three sequential cohorts which were dosed one after the other for a total of 30 participants. A dose level group received the same ABO809 dose and could be comprised of multiple cohorts. The first dose level group started with a cohort of 10 participants who received ABO809 at a dose of 1x10^4 oocysts. The study continued to enroll participants in the same dose level group if the desired incidences of infection and diarrheal illness were observed, up to a total of approximately 30 participants. If the desired incidences of infection and diarrheal illness were not observed, a new dose level group, receiving ABO809 at a dose of 1x10^6 oocysts, could be initiated. If needed to optimize the model, intermediate ABO809 doses could be evaluated.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
30

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Maryland
      • Baltimore, Maryland, United States, 21201
        • Novartis Investigative Site

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 50 years (Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Demonstrated understanding of Cryptosporidium disease, safety measures and transmission risks
  • Good health
  • Ability to communicate well with the Investigator

Exclusion Criteria:

- History of Cryptosporidium infection, gastrointestinal conditions (including diarrheal syndromes, gastroenteritis and gastrointestinal tract surgery), immunodeficiency, infections, significant medical concerns, hypersensitivity to nitazoxanide or other specified antibiotics.

Other protocol-defined inclusion/exclusion criteria may apply.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: ABO809
Participants will receive ABO809 at a single oral dose of 1x10^4 oocysts. Other doses such as 1x10^6 oocysts may be considered to optimize the model
Biological: Cryptosporidium parvum oocysts (ABO809)
ABO809 3x10^6 CE/3mL concentrate for oral suspension, single dose at Day 1

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Percentage of Participants With Cryptosporidium Infection From 72 Hours to 10 Days Post ABO809 Oral Administration
Time Frame: At ≥72 hours post-administration (or sooner if associated with symptoms suggestive of diarrheal illness) up to Day 10 (inclusive).
Cryptosporidium infection was measured by examining the presence of a Cryptosporidium antigen in stool using a commercially available diagnostic Enzyme Immunoassay (EIA) test. Up to 3 stool samples per day were collected, each separated by approximately 4-hour intervals, were analyzed by EIA for parasitological assessment of oocyst shedding.
At ≥72 hours post-administration (or sooner if associated with symptoms suggestive of diarrheal illness) up to Day 10 (inclusive).

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Percentage of Participants Showing Clinical Diarrheal Illness From Day 1 to Day 28 Post ABO809 Oral Administration
Time Frame: From Day 1 up to Day 28

Clinical diarrheal illness was defined as the occurrence of at least two diarrheal bowel events within 24 hours on at least two days after the administration of ABO809. Diarrhea is defined as at least one stool sample grading 3-5 on the Stool Grading system in one day. Grades 1 and 2 are considered normal stool and Grades 3-5 are considered diarrheal stool.

Grade 1 stool is defined as formed stool which does not take the shape of the container.

Grade 2 stool is defined as soft stool which does not easily take the shape of the container.

Grade 3 diarrheal stool is defined as thick liquid stool taking the shape of the container.

Grade 4 diarrheal stool is defined as opaque watery stool. Grade 5 diarrheal stool is defined as rice water or clear watery stools.
From Day 1 up to Day 28
Number of Diarrhea Stools Per Participant
Time Frame: From Day 1 up to Day 28

Diarrhea is defined as at least one stool sample grading 3-5 on the Stool Grading system in one day. Grades 1 and 2 are considered normal stool and Grades 3-5 are considered diarrheal stool.

Grade 1 stool is defined as formed stool which does not take the shape of the container.

Grade 2 stool is defined as soft stool which does not easily take the shape of the container.

Grade 3 diarrheal stool is defined as thick liquid stool taking the shape of the container.

Grade 4 diarrheal stool is defined as opaque watery stool. Grade 5 diarrheal stool is defined as rice water or clear watery stools.
From Day 1 up to Day 28
Overall Diarrheal Stool Weight
Time Frame: From Day 1 up to Day 28
Stool weight in grams of each stool from each participant were measured during inpatient period from Day 1 up to Day 10. Stool weight in grams of stool collected 24 hours prior to outpatient visit from each participant were measured during outpatient period from Day 14 to Day 28.
From Day 1 up to Day 28
Maximum Stool Grade by Stool Grade Category
Time Frame: From Day 1 up to Day 28
All collected stool samples were graded according to the Stool Grading system. Grades 1 and 2 are considered normal stool and Grades 3-5 are considered diarrheal stool. Grades 3-5 stools are defined as thick liquid diarrhea taking the shape of the container, opaque watery, rice water or clear watery stools. The maximum stool grade is the highest stool grade of all episodes in a participant.
From Day 1 up to Day 28
Time to Onset of Clinical Diarrheal Illness
Time Frame: From Day 1 up to Day 28
Clinical diarrheal illness was defined as the occurrence of at least two diarrheal bowel events within 24 hours on at least two days after the administration of ABO809. The time to onset is the number of days until the start diarrheal illness.
From Day 1 up to Day 28
Time to Resolution of Clinical Diarrheal Illness
Time Frame: From Day 1 up to Day 28
Clinical diarrheal illness was defined as the occurrence of at least two diarrheal bowel events within 24 hours on at least two days after the administration of ABO809. The time to resolution is the number of days until the resolution of diarrheal illness, which is defined as 2 or more consecutive days with no diarrheal stools (stool grades 1 or 2).
From Day 1 up to Day 28
Percentage of Participants With Characteristics of Clinical Signs and Symptoms Associated With Clinical Diarrheal Illness
Time Frame: From Day 1 up to Day 28
Clinical signs and symptoms associated with clinical diarrheal illness such as: abdominal pain, abdominal cramping, nausea, vomiting, fever, electrolyte disbalance, dehydration.
From Day 1 up to Day 28
Percentage of Participants With Cryptosporidium Infection From 72 Hours to Day 28 Post ABO809 Oral Administration
Time Frame: From 72 hours post-administration up to Day 28
Percentage of participants with Cryptosporidium infection following an oral administration of ABO809. Cryptosporidium infection were measured by examining the presence of a Cryptosporidium antigen in stool using a commercially available diagnostic Enzyme Immunoassay (EIA) test.
From 72 hours post-administration up to Day 28
Percentage of Participants With Fecal Shedding of Cryptosporidium Parvum Oocysts
Time Frame: From 72 hours post-administration up to Day 28
Percentage of participants with fecal shedding of Cryptosporidium parvum oocysts following an oral administration of ABO809. Fecal shedding will be measured by examining the presence of a Cryptosporidium antigen in stool using a commercially available diagnostic Enzyme Immunoassay (EIA) test.
From 72 hours post-administration up to Day 28
Time to Onset of Cryptosporidium Infection
Time Frame: From Day 1 up to Day 10
Time to onset is the number of days until the start of Cryptosporidium infection which were measured by examining the presence of a Cryptosporidium antigen in stool using a commercially available diagnostic Enzyme Immunoassay (EIA) test.
From Day 1 up to Day 10
Time to Resolution of Cryptosporidium Infection
Time Frame: From Day 1 up to Day 28
Time to resolution is the number of days until the resolution of Cryptosporidium infection in participants who developed an infection following an oral administration of ABO809. Resolution of Cryptosporidium infection is defined as no evidence of Cryptosporidium in stool samples collected over ≥2 consecutive days.
From Day 1 up to Day 28
Number of Participants With Adverse Events of Special Interest (AESIs)
Time Frame: Adverse events were reported from oral administration of ABO809 up to a maximum duration of 56 days.
The following adverse events associated with Cryptosporidium infection are considered AESIs in this trial: Gastroenteritis in the absence of Cryptosporidium infection, extraintestinal cryptosporidiosis, persistent or recurrent cryptosporidiosis, persistent cryptosporidium shedding, moderate or severe dehydration and non-intestinal sequelae including eye pain or joint pain.
Adverse events were reported from oral administration of ABO809 up to a maximum duration of 56 days.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Novartis Pharmaceuticals

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Mohamed Al-Ibrahim, Pharmaron CPC, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 7, 2022

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 7, 2022

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 27, 2022

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
August 31, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 31, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
September 5, 2021

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
October 2, 2024

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 27, 2024

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
June 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CABO809A02101

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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