This study is to determine the safety and immunogenicity of an Enterotoxigenic Escherichia coli (ETEC) candidate vaccine, attenuated recombinant Double Mutant Heat-Labile Toxin (dmLT) from ETEC, administered by the Intradermal (ID) route. The sample size has been determined based on the historic sample, not on power calculations.The study will involve 99 subjects (83 vaccinees and 16 placebo controls) in 4 consecutive cohorts of 16 individuals each (13 vaccinees and 3 placebo controls) and the final cohort of 35 (31 vaccinees and 4 placebos) subjects. The primary objective is to assess the safety and tolerability of dmLT vaccine when administered in three doses intradermally over a range of dosages in healthy adult subjects.

NCT02531685

Conditions

1. Gastroenteritis Escherichia Coli

Interventions

1. Other: Placebo
2. Biological: Recombinant Double Mutant Heat-Labile Toxin LT(R192G/L211A) (dmLT) Oral enterotoxigenic Escherichia coli (ETEC) Vaccine

MeSH:Gastroenteritis

A Phase 1 Double-Blind Placebo-Control Dose Escalating Study to Evaluate the Safety and Immunogenicity of Double Mutant Heat-Labile Toxin LTR192G/L211A (dmLT) From Enterotoxigenic Escherichia Coli (ETEC) by Intradermal (ID) Vaccination in Healthy Adults. --- L211A ---

This is a trial to evaluate the safety and immunogenicity of double mutant heat-labile toxin LTR192G/L211A (dmLT) from Enterotoxigenic Escherichia coli (ETEC) by oral, sublingual, or intradermal vaccination in approximately 135 healthy adult volunteers, age 18-45 years. Study duration is approximately 2.5 years, with each participant duration for up to 9 months depending on the route of dmLT administered. There is no specific hypothesis being tested in this study. The primary objective of this study is to assess the reactogenicity, safety, and tolerability of dmLT when administered in three sequential doses, over a range of dosages by oral, sublingual, or intradermal routes.

NCT03548064

Conditions

1. Gastroenteritis Escherichia Coli
2. Immunisation

Interventions

1. Other: Placebo
2. Other: Placebo
3. Other: Placebo
4. Biological: Recombinant Double Mutant Heat-Labile Toxin LT(R192G/L211A) (dmLT) Oral enterotoxigenic Escherichia coli (ETEC) Vaccine
5. Biological: Recombinant Double Mutant Heat-Labile Toxin LT(R192G/L211A) (dmLT) Oral enterotoxigenic Escherichia coli (ETEC) Vaccine
6. Biological: Recombinant Double Mutant Heat-Labile Toxin LT(R192G/L211A) (dmLT) Oral enterotoxigenic Escherichia coli (ETEC) Vaccine

MeSH:Gastroenteritis

A Phase 1 Double-Blinded, Placebo-Controlled, Dose Escalation Study to Evaluate the Safety and Immunogenicity of Double Mutant Heat-Labile Toxin LTR192G/L211A (dmLT) From Enterotoxigenic Escherichia Coli (ETEC) by Oral, Sublingual, or Intradermal Vaccination in Adults Residing in an Endemic Area. --- L211A ---

A Double-Blind Placebo-Control Dose Escalating Study to Evaluate the Safety and Immunogenicity of dmLT by Oral, Sublingual and Intradermal Vaccination in Adults Residing in an Endemic Area This is a trial to evaluate the safety and immunogenicity of double mutant heat-labile toxin LTR192G/L211A (dmLT) from Enterotoxigenic Escherichia coli (ETEC) by oral, sublingual, or intradermal vaccination in approximately 135 healthy adult volunteers, age 18-45 years. --- L211A ---

Gastroenteritis Escherichia Coli Immunisation Gastroenteritis This is a Phase 1 double-blinded, placebo-controlled, dose-escalation trial to evaluate the safety and immunogenicity of double mutant heat-labile toxin LTR192G/L211A (dmLT) from Enterotoxigenic Escherichia coli (ETEC) by oral, sublingual, or intradermal vaccination in approximately 135 healthy adult volunteers, age 18-45 years, who meet all the eligibility criteria and reside in Bangladesh. --- L211A ---

A Phase 1 dose escalating study of ETEC candidate vaccine to determine safety and immunogenicity of a multi-dose regimen in healthy adult volunteers. The study will be conducted at Cincinnati Children's Hospital Medical Center (CCHMC). The primary objectives assess the safety and tolerability of dmLT vaccine when administered in three doses sublingually over a range of dosages in healthy adult subjects. The secondary objectives assess long-term safety follow-up from immunization through Month 7 post vaccination, following three SL doses of dmLT vaccine over a range of dosages and comparing with three doses of a comparable dosage of oral vaccine. The study subject population is 52 healthy adult male and female subjects, ages 18 to 45. Subject participation duration is approximately 8 months with study duration of approximately 1.5-2 years, including 6-7 months of follow-up.

NCT02052934

Conditions

1. Gastroenteritis Escherichia Coli

Interventions

1. Biological: Recombinant Double Mutant Heat-Labile Toxin LT(R192G/L211A) (dmLT) Oral enterotoxigenic Escherichia coli (ETEC) Vaccine
2. Biological: Recombinant Double Mutant Heat-Labile Toxin LT(R192G/L211A) (dmLT) Oral enterotoxigenic Escherichia coli (ETEC) Vaccine

MeSH:Gastroenteritis

A Phase 1 Dose Escalating Study of Double Mutant Heat-Labile Toxin LTR192G/L211A (dmLT) From Enterotoxigenic Escherichia Coli (ETEC) by Sublingual or Oral Immunization to Determine Safety and Immunogenicity of a Multi-dose Regimen in Adult Humans. --- L211A ---