Shigellosis Clinical Trial
Official title:
A Phase I Dose Escalation Study to Assess the Safety and Immunogenicity of the SF2a-TT15 Conjugate Vaccine Against S. Flexneri 2a in Healthy Adult Volunteers
This is a first-in-human, single-center, single-blinded, observer-masked randomized, dose escalation (two doses), placebo-controlled study in healthy volunteers.
Subjects will be assigned to one of two cohorts.
1. Cohort 1 will receive the lower dose of 2 μg vaccine (with or without alum adjuvant) or
matching placebo.
2. Cohort 2 will receive the higher dose of 10 μg vaccine (with or without alum adjuvant)
or matching placebo.
Eligible subjects will be randomized to receive the 2 μg dose or 10 µg without or with alum
or matching placebo, at a ratio of 3:1, as three single IM injections. There will be an
interval of 28(±3) days) between each treatment.
The study will be conducted in a stepwise approach in which a "Pioneer" Group of 2 subjects
(one receiving the active vaccine and one receiving the matching placebo) will receive the
first injection. These subjects will remain in-house for a 24-hours medical observation after
the first injection (not required in the subsequent injections) Once it has been established
that there are no safety concerns in the non-adjuvanted "Pioneer" Groups (and after no less
than 48 hrs), the next "Pioneer" group (one subject receiving adjuvanted 2 μg vaccine and one
receiving the matching alum placebo) will be injected.
If no safety concerns are raised in this group also, after no less than 48 hrs, the rest of
the subjects may receive the first injection.
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