- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05698225
Experimental Pneumococcal Carriage in People Living With HIV
Characterising Pneumococcal Carriage and Immunity in People Living With HIV in Blantyre, Malawi, Following Experimental Pneumococcal Inoculation
The goal of this experimental pneumococcal carriage study is to to characterise rates and determinants of experimental pneumococcal carriage in PLHIV.
The main questions it aims to answer are:
- can PLHIV be experimentally inoculated with pneumococcus in a safe manner?
- what are the immunological determinants of pneumococcal carriage in PLHIV compared to HIV-negative participants?
- how do the pneumococcal carriage dynamics differ between PLHIV and HIV-negative participants?
Participants will be inoculated intranasally with a controlled concentration of pneumococcus after which they will be monitored for 21 days during which nasal and systemic immune dynamics and pneumococcal carriage dynamics will be evaluated. At the end of the study any participants exhibiting carriage will have the pneumococcus cleared with antibiotics.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Study Type
Enrollment (Anticipated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Klara Doherty, MBChB
- Phone Number: +265885908115
- Email: klara.doherty@lstmed.ac.uk
Study Locations
-
-
-
Blantyre, Malawi
- Malawi-Liverpool Wellcome City
-
Contact:
- Klara Doherty, MBChB
- Email: klara.doherty@lstmed.ac.uk
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Aged 25 to 45 years old
- Fluent spoken and written Chichewa or English
- Able to give informed written consent
- Access to a functional mobile phone
- Establish on antiretroviral therapy for ≥2 years (if PLHIV)
- Viral load below the lower limit of detection (<LDL) at screening (if PLHIV)
- CD4 count over 350 cells/mm³ at screening (if PLHIV)
Exclusion Criteria:
- HIV-associated hospitalisation and/or treatment for major illness in preceding 2 years
- Currently under investigation for HIV-associated weight-loss, chronic diarrhoea, chronic cough, or another unexplained symptom
- Previous illness caused by pneumococcus
- Additional condition or medication impairing immune response or increasing risk of pneumococcal disease
- Living in close contact with an individual vulnerable to pneumococcal disease
- Allergy to penicillin
- Acute illness in 7 days preceding inoculation
- Antibiotic course in last 2 weeks (excluding prophylactic co-trimoxazole in PLHIV)
- Pregnant or trying to conceive
- Involved in another clinical study (unless observational or in follow-up)
- Current regular cigarette smoking (5+ cigarettes per week)
- Natural carrier of pneumococcus serotype 6B at screening visit
- Participants without a guardian
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Inoculation with Streptococcus pneumoniae serotype 6B
Participants will be inoculation with a controlled concentration of full sequenced, fully antibiotic sensitive Streptococcus pneumonia serotype 6B
|
A controlled concentration of streptococcus pneumoniae serotype 6B is placed in both nares of participants
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Proportion of participants with pneumococcal carriage in the nasopharynx post-inoculation
Time Frame: From inoculation up to 21 days post-inoculation
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Measured by classic culture and PCR-based methods
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From inoculation up to 21 days post-inoculation
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Average pneumococcal carriage density in the nasopharynx post-inoculation
Time Frame: From inoculation up to 21 days post-inoculation
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Measured by classic culture and PCR-based methods
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From inoculation up to 21 days post-inoculation
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Nasal immunoglobulin concentration at baseline
Time Frame: Baseline
|
Measured in nasal fluid
|
Baseline
|
Change in nasal immunoglobulin concentration following inoculation
Time Frame: Baseline to 21 days post-inoculation
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Measured in nasal fluid
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Baseline to 21 days post-inoculation
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Density of immune cells in the nasal mucosa at baseline
Time Frame: Baseline
|
Immune cell to epithelial cell ratio measured in nasal mucosal cell samples
|
Baseline
|
Change in density of immune cells in the nasal mucosa following inoculation
Time Frame: Baseline up to 21 days post-inoculation
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Immune cell to epithelial cell ratio measured in nasal mucosal cell samples
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Baseline up to 21 days post-inoculation
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Immune cell activation activation in the nasal mucosa at baseline
Time Frame: Baseline
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Concentration of markers of immune cell activation measured in nasal fluid and cell samples
|
Baseline
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Change in immune cell activation in the nasal mucosa following inoculation
Time Frame: Baseline up to 21 days post-inoculation
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Concentration of markers of immune cell activation measured in nasal fluid and cell samples
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Baseline up to 21 days post-inoculation
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Collaborators and Investigators
Investigators
- Principal Investigator: Stephen Gordon, MA MD, Malawi-Liverpool Wellcome Centre
Study record dates
Study Major Dates
Study Start (Anticipated)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- EHPC in PLHIV
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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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