Status and phase
Conditions
Treatments
About
This is a Multicenter, observer-blinded, randomized, Active controlled, Phase 3 study in healthy 6 months to 45 years aged Nepalese at the time of the first vaccine dose.
The study objectives are:
I. Demonstrate non-inferiority of Vi-DT compared to Typbar TCV® as measured by seroconversion rates of anti-Vi IgG ELISA antibody titers, 4 weeks after single dose (pooled immunogenicity of three lots of Vi-DT)
II. Demonstrate the equivalence of immunogenicity as measured by anti-Vi IgG GMT of three lots of Vi-DT vaccine 4 weeks after single dose.
Full description
Subjects will be stratified according to age. The study procedure is as follows:
Visit 1 (day-1 to -7): Screen participants by medical/medications history, physical examination, Vital signs, Urine pregnancy test (UPT)
Visit 2 (day 0): Enroll, randomize and administer vaccine to eligible participants and assess participant safety by physical examination and Vital signs, Collect blood for immunogenicity assessments.
Visit 3 (day 7): Check solicited adverse reaction 7 days post vaccination and Assess participant safety by physical examination and Vital signs
Visit 4 (day 28): Assess participant safety by physical examination and Vital signs, Collect blood for immunogenicity assessments
Visit 5 (day 84): Assess participant safety by physical examination and Vital signs
Visit 6 (day 168): Assess participant safety by physical examination and Vital signs, Collect blood for immunogenicity assessments, and fill in study completion form in the absence of any safety concern.
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.
For retention: After vaccination, field health worker/designee will contact participant every day till Day 7 by physical visit or by phone call. Follow-up reminder calls will be done very frequently as per discretion of study staff until 24 weeks for all participant to assess participant safety.
Enrollment
Sex
Ages
Volunteers
Inclusion criteria
Exclusion criteria
Child with a congenital abnormality
Subject concomitantly enrolled or scheduled to be enrolled in another trial
Known history of immune function disorders including immunodeficiency diseases (Known HIV infection or other immune function disorders)
Chronic use of systemic steroids (>2 mg/kg/day or >20 mg/day prednisone equivalent for periods exceeding 10 days), cytotoxic or other immunosuppressive drugs
Receipt of blood or blood-derived products in the past 3 months
Subject with a previously ascertained or suspected disease caused by S. Typhi
Subject who have had household contact with/and or intimate exposure to an individual with laboratory-confirmed S. Typhi
Individual who has previously received a typhoid vaccine
Subject who has received or is expected to receive other vaccines from 1 month prior to IP vaccination to Visit 4 (approx.1 month post IP) except PVC booster as per EPI schedule
Known history or allergy to vaccines or other medications
History of uncontrolled coagulopathy or blood disorders
Any abnormality or chronic disease which in the opinion of the investigator might be detrimental for the safety of the subject and interfere with the assessment of the study objectives
Any female participant who is lactating, pregnant* or planning for pregnancy during the course of study period
Participants/Parents/LAR planning to move from the study area before the end of study period
As per Investigator's medical judgement individuals could be excluded from the study inspite of meeting all inclusion/exclusion criteria mentioned above
Temporary Contraindication
Acute illness, in particular infectious disease or fever (axillary temperature ≥37.5°C), within three days prior to enrolment and vaccination.
Primary purpose
Allocation
Interventional model
Masking
1,800 participants in 4 patient groups
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Data sourced from clinicaltrials.gov
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