Oral Cholera Vaccine(EuBiologics)

Number of doses and intervals: Two doses, 2 weeks apart
Method of administration: Oral administration
Volume of vaccine to be administered: 1.5 mL/dose
Observational period: 4 weeks (2 weeks after each dose)
Number of visits: 3 visits
Visit 1: Screening and enrollment (1st dosing)
Visit 2: 2nd dosing 2 weeks after 1st dose (14+3 days)
Visit 3: 2 weeks after the 2nd dose (28+3 days), end of subject participation. This study will be carried out in healthy adults and children, at two sites, enrollment will be competitive between the sites. Subjects will be stratified according to age into adults (18
40 years of age) and children (1
17 years of age). According to the pre-generated randomization list, the participants will be randomized to the test or comparator groups (Visit 1) and will be given either the test vaccine or the comparator vaccine. For immunogenicity assessment, blood sample will be taken at Visit 1 (prior to vaccination), Visit 2 (prior to vaccination), and at the end-of-study Visit (Visit 3). For Safety assessment: the participants will be observed for 30 minutes post vaccination and instructed to record solicited adverse events that occur up to 6 days after vaccination on the participant diary card.
This study is observer-blind: vaccine administrator and vaccine safety evaluator will be two distinct persons to avoid bias of safety assessment. Trial staff other than the vaccine administrator will remain blinded and will not handle the investigational product.

The absence of a boosting response after a 14 day interval with the two-dose regimen of the modified killed oral cholera vaccine raises the possibility that a longer dosing interval may be required to observe a boost in the immune response. This study will compare the immune responses following 14-day and 28-day dosing intervals.