NCT03926728

Safety and Immunogenicity of a Chlamydia Vaccine CTH522

A Phase I, Double-blind, Parallel, Randomised and Placebo-controlled Trial Investigating the Safety and Immunogenicity of a Chlamydia Vaccine, CTH522, in Healthy Adults

• Status: Completed
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 65 (actual)
• Sponsor: Statens Serum Institut · Academic / Other
• Sex: All
• Age: 18 Years – 45 Years
• Healthy volunteers: Accepted

Summary

CHLM-02 was a phase I, double-blind, randomized, placebo-controlled trial of the chlamydia vaccine CTH522. 65 trial participants were randomized into 12 groups and six cohorts (A1 to F2). Cohorts A to E received three intramuscular (IM) injections of CTH522 (Day 0, 28, and 112). Cohorts A to D received CTH522 adjuvanted with Cationic Adjuvant Formulation (CAF®) 01 IM in two doses (85µg \[A to C\] or 15µg \[D\]). Cohort E received 85µg CTH522 adjuvanted with CAF®09b. Cohorts B and C received unadjuvanted CTH522 boost via the topic ocular (TO) or intradermal (ID) route, respectively, jointly with the second and third IM vaccinations. Cohort F received placebo. The effect of mucosal recall on eye immunity with TO CTH522 or placebo was assessed Day 140.

Detailed description

This trial was a phase I, double-blind, parallel, randomised, and placebo-controlled trial of the chlamydia vaccine CTH522 in healthy adults. It was planned to randomize 66 subjects but only 65 subjects were randomized. Cohorts A-D investigated CTH522-CAF01 administered IM in two doses (85 mcg and 15 mcg). Cohort E investigated CTH522-CAF09b administered IM in one dose (85 mcg). Cohort F was the placebo group. The enrolled subjects were to complete 12 trial visits. All subjects in the active cohorts (cohort A-E) were to receive three IM injections of the adjuvanted CTH522 and some (cohort B and C) were to receive the non-adjuvanted CTH522 via the TO or ID route (given at the same time as the 2nd and 3rd IM vaccinations). All active cohorts were to receive TO administration as a boost at Day 140 of either the non-adjuvanted CTH522 (12 mcg in each eye) or placebo. * Cohort A received three IM vaccination of 85 mcg CTH522-CAF01. This cohort was divided into two groups: A1 received ID placebo at Day 28 and Day 112, and TO placebo at Day 140, while A2 received TO placebo at Day 28 and Day 112, and non-adjuvanted TO CTH522 boost at Day 140. * Cohort B received three IM vaccinations of 85 mcg CTH522-CAF01. This cohort was divided into two groups: B1 received TO vaccination of the non-adjuvanted CTH522 at Day 28 and 112 and TO placebo at Day 140, while B2 received the same for Day 28 and 112, but non-adjuvanted TO CTH522 boost at Day 140. The two additional TO doses of CTH522 (12 mcg in each eye) were administered in each eye. The rationale for this schedule was to investigate the impact of simultaneous TO administration of the antigen on the immunogenicity results. * Cohort C received three IM vaccinations of 85 mcg CTH522-CAF01. This cohort was divided into two groups: C1 received ID vaccination of the non-adjuvanted 24 mcg CTH522 at Day 28 and 112 and TO placebo at Day 140, while C2 received the same for Day 28 and 112, but TO 12 mcg CTH522 boost in each eye at Day 140. The rationale for this schedule was to investigate the impact of simultaneous ID administration of the antigen on the immunogenicity results. * Cohort D received three IM vaccinations of 15 mcg CTH522-CAF01. The rationale for the A and D cohorts was to investigate the impact of the two IM CTH522 doses on the immunogenicity results. * Cohort E received three IM vaccinations of 85 mcg CTH522-CAF09b. The rationale for the A and E cohorts was to investigate the impact of the adjuvant on the immunogenicity results. * Cohort F received placebo in the form of 0.9% NaCl saline (IM, ID and TO).

Conditions

• Trachoma

Interventions

Type	Name	Description
BIOLOGICAL	CTH522-CAF01 IM	On-site reconstitution of IMPs is performed by mixing 85 mcg CTH522 with CAF01. The preferred for IM is in the non-dominant deltoid muscle. IM injection will be performed with a 1-2 mL polypropylene Luer-Lok™ syringe via 23-25 gauge needle. The identity of the injected trial vaccine will be known to the clinical site staff dispensing and/or injecting the trial vaccine to the subject and by the unblinded trial monitor. The identity of the trial vaccine administered will remain unknown to the subject during the trial.
BIOLOGICAL	CTH522-CAF09b IM	On-site reconstitution of IMPs is performed by mixing 85 mcg CTH522 with CAF09b. The preferred for IM is in the non-dominant deltoid muscle. IM injection will be performed with a 1-2 mL polypropylene Luer-Lok™ syringe via 23-25 gauge needle. The identity of the injected trial vaccine will be known to the clinical site staff dispensing and/or injecting the trial vaccine to the subject and by the unblinded trial monitor. The identity of the trial vaccine administered will remain unknown to the subject during the trial.
BIOLOGICAL	CTH522 ID	24 mcg CTH522 given ID is in the non-dominant deltoid muscle. ID with a 1 mL syringe via a 26-28 gauge needle using a NanoPass device or similar. The identity of the injected trial vaccine will be known to the clinical site staff dispensing and/or injecting the trial vaccine to the subject and by the unblinded trial monitor. The identity of the trial vaccine administered will remain unknown to the subject during the trial.
BIOLOGICAL	CTH522 TO	24 mcg CTH522 (12 mcg in each eye) TO administrations will be performed using a Gilson positive displacement pipette. The identity of vaccine will be known to the clinical site staff dispensing/administrating the trial vaccine to the subject and by the unblinded trial monitor. The identity of the trial vaccine administered will remain unknown to the subject during the trial.
BIOLOGICAL	Placebo (Saline)	Placebo only given as IM, ID and TO.

Timeline

• Start date: 2020-02-17
• Primary completion: 2022-02-22
• Completion: 2022-02-22
• First posted: 2019-04-24
• Last updated: 2024-08-22
• Results posted: 2024-08-22

Locations

1 site across 1 country: United Kingdom