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NCT Number: NCT04204096

Immune Equivalence Between Multi-dose and Single Dose Formulation of Vi-DT and Their Overall Safety (Phase III)

This is a multicenter, randomized, observer-blinded, controlled, immune equivalence study of a multi-dose (MD) formulation with 2PE preservative of SK bioscience Vi-DT compared to single dose (SD) formulation without preservative of SK bioscience Vi-DT in participant (6 months - 45 years) including safety population.

The study objectives are as follows:

* Primary objective. Demonstrate the immune equivalence as measured by anti-Vi IgG Geometric Mean Titer (GMT) of multi dose formulation against single dose formulation of Vi-DT (18-45 year age stratum), at 4 weeks after a single dose. * Secondary objective 1. Demonstrate the immune equivalence as measured by seroconversion rates of anti-Vi IgG antibody titres of multi dose formulation against single dose formulation of Vi-DT vaccine (18-45 year age stratum) at 4 weeks after a single dose. * Secondary objective 2. Describe safety profile in all age strata combined (age 6 months - 45 years old) and in each age stratum, at 4 weeks after a single dose of SD/MD formulation/control (Meningococcal Conjugate Vaccine).

There are total 5 scheduled visits as follows:

* Visit 1(D-7 to 0): Screening * Visit 2(D0): Enrollment, vaccination, safety follow-up and blood collection for immunogenicity assessment (only for subjects 18 years old and above) * Visit 3(D7): Safety follow-up * Visit 4(D28): Safety follow-up and blood collection for immunogenicity assessment (only for subjects 18 years old and above) * V5(D168): Safety follow-up

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Key information

Conditions

Typhoid Bacterial Infections Bacterial Infections and Mycoses Enterobacteriaceae Infections Gram-Negative Bacterial Infections Infections Salmonella Infections Typhoid Fever

Age range

6 month–45 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 3

Primary location

Lingga Health Research Center, Calamba, Laguna, Philippines

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About this study

The vaccines will be administered to 1,500 healthy participants of 6 months to 45 years of age and followed up for 24 weeks after the injection for safety. Adult participants (N=500) will be followed up for immunogenicity at 4 weeks and all participants till 24 weeks for safety post single dose of either MD & SD formulations. 300 healthy participants will be given control vaccine (locally available licensed Meningococcal conjugate vaccine) to check the background safety events. The primary objective is to demonstrate the equivalence of immunogenicity as measured by anti-Vi IgG GMT titer at 4 weeks after a single dose of MD/SD formulation in adults. The secondary objective is to demonstrate the equivalence of immunogenicity in terms of seroconversion rates as measured by anti-Vi IgG ELISA antibody titers, at 4 weeks after a single dose of MD/SD formulation in adults. A descriptive evaluation of safety at 4 and 24 weeks post single dose of (SD/MD/Meningococcal vaccine), will be performed. The Vi-DT vaccine from both MD & SD formulations will be administered as a single dose of 25 µg/0.5 mL.

Eligible participants enrolled into the study will be randomized into one of the three study groups within each age stratum of 6 months to less than 2 years, 2 to less than 18 years, and 18 to 45 years. Participants will be observed at the study site for 30 minutes after vaccination for safety assessment. Solicited adverse events will be recorded on a diary card during 7 days after vaccination. Unsolicited adverse events will be recorded during the 4 weeks after vaccination. Serious adverse events will be recorded during the entire study period. With the exception of designated study site personnel responsible for vaccine administration, site investigators, study nurse, and those assessing clinical outcomes, and data analysts will be blinded to vaccine allocation until data base lock for the final analysis.

Blood samples will be collected at baseline prior to vaccination and at 4 weeks post vaccination from adults (18-45 years) for immunogenicity assessment

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy participants 6 months to 45 years of age at enrollment
  • Participants/Parent(s)/LAR who have voluntarily given informed consent/assent
  • Participants/Parent(s)/LAR willing to follow the study procedures of the study and available for the entire duration of the study

Exclusion criteria

  • Child with a congenital abnormality
  • Participant who has already received meningococcal conjugate vaccine
  • Participants 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
  • Participant with a previously ascertained or suspected disease caused by S. Typhi (confirmed either clinically, serologically or microbiologically)
  • Participant who has had household contact with and/or intimate exposure to an individual with laboratory-confirmed S. Typhi
  • Individual who has previously received a typhoid vaccine
  • Participant who has received other vaccines from 1 month prior to test vaccination or planned to receive any vaccine within 1 month (except a measles containing vaccine as per government vaccination campaign)
  • 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 participant 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/Parent(s)/LAR planning to move from the study area before the end of study period
  • As per Investigator's medical judgement individual could be excluded from the study in spite of meeting all inclusion/exclusion criteria mentioned above

Treatment and study plan

Vi-DT (Multi-dose formulation)

Biological
  • Manufacturer: SK bioscience Co., Ltd.
  • Dose formulation: 25 µg Vi polysaccharide /0.5 mL, presented in Type I glass vial (multi dose Vi-DT with preservative 2 PE)
  • Mode of Administration: 0.5 mL by intramuscular injection in the left anterolateral thigh or left arm deltoid region in participants below 2 years of age, less dominant arm deltoid region in age group 2 to 45 years
  • Storage Conditions: +2 to +8°C

Other names: Vi polysaccharide typhoid vaccine conjugated with Diphtheria toxoid protein

Vi-DT (Single dose formulation)

Biological
  • Manufacturer: SK bioscience Co., Ltd.
  • Dose formulation: 25 µg Vi polysaccharide /0.5 mL, presented in Type I glass vial (single dose Vi-DT without any preservative)
  • Mode of Administration: 0.5 mL by intramuscular injection in the left anterolateral thigh or left arm deltoid region in participants below 2 years of age, less dominant arm deltoid region in age group 2-45 years
  • Storage Conditions: +2 to +8°C

Other names: Vi polysaccharide typhoid vaccine conjugated with Diphtheria toxoid protein

Control Vaccine

Biological
  • For participant ≥ 1 year one dose of locally licensed Meningococcal conjugate vaccine will be administered
  • For participants 6 months to 1 year one dose of locally licensed Meningococcal conjugate vaccine will be administered during the study and the next dose will be provided after the study unblinding at the completion of 6 months follow up of last subject.

Other names: Locally available Meningococcal conjugate vaccine

Primary outcomes

  1. Geometric Mean Titers (GMT) of anti-Vi IgG

    Time frame: At 4 weeks (28 days) post vaccination of Vi-DT (MD/SD)

    If the 95% confidence interval of the ratio of GMT estimate of Vi-DT(MD) over GMT of Vi-DT(SD) is located within the bounds of 0.67to 1.5, then Vi-DT (MD) is equivalent to Vi-DT (SD) in terms of GMT of anti-Vi IgG with significance level of 0.05.

Secondary outcomes

  1. Seroconversion rates of anti-Vi IgG ELISA antibody titres

    Time frame: At 4 weeks (28 days) from baseline (Day 0; before vaccination of Vi-DT (MD/SD)

    If the 95% confidence interval of the estimate of difference of seroconversion rate between Vi-DT (MD) and Vi-DT (SD) at 4 weeks (Day 28) is located within the bounds -10% to 10%, then Vi-DT (MD) is equivalent to Vi-DT (SD) in terms of sero-conversion rate, which is defined as 4 fold increase of anti Vi IgG from baseline with significance level of 0.05.

Other outcomes

  1. Safety endpoints by each formulation and overall and within each age stratum

    Time frame: Solicited AEs during the 7 days after vaccination/Unsolicited AEs during 4 weeks (28 days) after vaccination/SAEs during the entire study period

    • Frequency of local and systemic solicited adverse events during the 7 days after each dose
    • Solicited local reactions at the site of injection: pain, tenderness, erythema/redness, swelling/induration and pruritus
    • Solicited systemic reactions (adapted to each age group): fever, lethargy, irritability, nausea/vomiting, arthralgia, diarrhea, drowsiness, loss of appetite, chills, headache, fatigue, myalgia and persistent crying
    • Frequency of unsolicited adverse events during 4 weeks (28 days) after vaccination
    • Frequency of Serious Adverse Events during the entire study period

Sponsors and collaborators

Lead sponsor

International Vaccine Institute

Other

Collaborators

  • Bill and Melinda Gates Foundation
  • SK Bioscience Co., Ltd.

Registry information

Official study title

A Phase III, Multicenter, Observer Blind, Randomized, Controlled Study to Evaluate Immune Equivalence of Multi-dose Formulation Against Single-dose Formulation of Vi-DT Typhoid Conjugate Vaccine and Safety in Healthy Filipino......

Important dates

Study start
2020
Primary completion
2020
Study completion
2021
First posted
Dec 18, 2019
Registry last updated
Aug 27, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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