Conditions: Campylobacter Infection
Keywords: Campylobacter jejuni
Allocation: NON_RANDOMIZED | Intervention model: PARALLEL
Enrollment: 48
Healthy volunteers: yes

Brief summary:
The purpose of this study is to assess the safety of increasing doses of a potential vaccine against Campylobacter with and without Alhydrogel®, an aluminum hydroxide adjuvant. This study will also assess immune responses induced by the vaccine.

Detailed description:
This is an open-label, dose-escalating study in which a total of 48 healthy volunteers will receive 2 vaccinations (one on Day 0 and one on Day 28 ± 2 days).

There are 3 cohorts (dose levels) with 2 groups of 8 volunteers in each cohort. A cohort will be administered one of 3 intramuscular (IM) doses at 2 μg, 5 μg, or 10 μg of Capsule-Conjugate Campylobacter Vaccine (CJCV1) with or without Alhydrogel®, aluminum hydroxide adjuvant (alum) at 125 μg.

An interval no less than 1 week will separate the last dose of a volunteer group from the first dose of the next volunteer group (receiving different CJCV1 doses). Blood specimens will be collected at intervals to examine systemic and mucosal antigen-specific immune responses. Vaccine safety will be actively monitored during vaccination and for 28 days (± 2 days) following the second vaccination and complete the study with a telephone follow-up approximately 6 months (± 1 month) after the first vaccination. The total duration of participation in this study is up to 270 days (including screening).

Arms:
arm 1: Two vaccinations (one on Day 0 and one on Day 28) with an intramuscular dose of Capsule-Conjugate Campylobacter Vaccine (CJCV1) equivalent to 2 μg of polysaccharide and 0 μg of Alhydrogel®, aluminum hydroxide adjuvant (Alum) arm 2: Two vaccinations (one on Day 0 and one on Day 28) with an intramuscular dose of Capsule-Conjugate Campylobacter Vaccine (CJCV1) equivalent to 2 μg of polysaccharide and 125 μg of Alhydrogel®, aluminum hydroxide adjuvant (Alum) arm 3: Two vaccinations (one on Day 0 and one on Day 28) with an intramuscular dose of Capsule-Conjugate Campylobacter Vaccine (CJCV1) equivalent to 5 μg of polysaccharide and 0 μg of Alhydrogel®, aluminum hydroxide adjuvant (Alum) arm 4: Two vaccinations (one on Day 0 and one on Day 28) with an intramuscular dose of Capsule-Conjugate Campylobacter Vaccine (CJCV1) equivalent to 5 μg of polysaccharide and 125 μg of Alhydrogel®, aluminum hydroxide adjuvant (Alum) arm 5: Two vaccinations (one on Day 0 and one on Day 28) with an intramuscular dose of Capsule-Conjugate Campylobacter Vaccine (CJCV1) equivalent to 10 μg of polysaccharide and 0 μg of Alhydrogel®, aluminum hydroxide adjuvant (Alum) arm 6: Two vaccinations (one on Day 0 and one on Day 28) with an intramuscular dose of Capsule-Conjugate Campylobacter Vaccine (CJCV1) equivalent to 10 μg of polysaccharide and 125 μg of Alhydrogel®, aluminum hydroxide adjuvant (Alum)

Interventions: intervention 1: Capsule-Conjugate Campylobacter Vaccine (CJCV1) intervention 2: Alhydrogel®, aluminum hydroxide adjuvant (alum)
Intervention descriptions: intervention 1: The capsule of Campylobacter jejuni strain 81-176 (CPS81-176) conjugated to the mutated diphtheria toxin cross-reacting material 197 (CRM197) (lyophilized CPS-CRM197 conjugate) (CJCV1) intervention 2: None

Protocol document: