RecruitingPhase 3NCT06978621

Immunogenicity and Safety of I-HAV in Healthy Thai Children and Adolescents Lacking Protective Antibody After L-HAV

Immunogenicity and Safety of Inactivated Hepatitis A Vaccine in Healthy Thai Children and Adolescents Lacking Protective Antibody Levels After a Single Dose of Live-attenuated Hepatitis A Vaccine


Sponsor

Chiang Mai University

Enrollment

36 participants

Start Date

May 25, 2025

Study Type

INTERVENTIONAL

Conditions

Summary

Hepatitis A virus (HAV) remains a common infection in Thai children. Two HAV vaccines are available: inactivated vaccine (I-HAV, 2 doses) and live-attenuated vaccine (L-HAV, single dose), but neither is included in Thailand's national immunization program. Our previous randomized, active-controlled, open-label, non-inferiority trial trial found that some participants remained seronegative after one L-HAV dose (anti-HAV IgG \<1 S/CO) (preliminary data). This study aims to evaluate the immunogenicity and safety of an additional dose of I-HAV in healthy Thai children and adolescents who did not develop protective antibody levels after a single dose of L-HAV.


Eligibility

Min Age: 18 MonthsMax Age: 20 Years

Inclusion Criteria4

  • Thai children and adolescents who previously participated in the previous RCT study
  • Previously randomized to receive one dose of L-HAV vaccine within the past 1 year (+/- 2 months)
  • Have not demonstrate a seropositivity against HAV (anti-HAV IgG <1 S/CO) at 1 month after L-HAV vaccination
  • Participants and/or caregivers gives written inform consent/assent form

Exclusion Criteria13

  • History of acute illness within 4 weeks prior to study enrollment
  • Has a history of illness or a diagnosis consistent with hepatitis A after receiving the live attenuated hepatitis A vaccine as part of participation in a previous research study
  • Has a history of receiving any additional hepatitis A vaccine after participating in the previous research study
  • Presence of fever (body temperature ≥38.0°C), jaundice, or yellowing of the eyes within 4 weeks prior to study enrollment
  • Has underlying conditions including thrombocytopenia, coagulopathy, hemophilia A or B, neurological disorders, immunodeficiency disorders, chronic liver disease, or chronic hepatitis B or C infection
  • Has received immunosuppressive agents, immunomodulatory agents, or high-dose corticosteroids (greater than 2 mg/kg/day or more than 20 mg/day) for more than 14 consecutive days within 6 months prior to study enrollment
  • Has received blood products or blood components, including immunoglobulins, within 6 months prior to study enrollment
  • Has received other live vaccines within 30 days prior to study enrollment
  • Has history of allergy to vaccines or any vaccine components, such as aluminum hydroxide, 2-phenoxyethanol, neomycin, formaldehyde, or gentamicin sulfate, or has history of severe allergic reactions (e.g., anaphylaxis) to any vaccines
  • Women planning for pregnancy, pregnant women or lactating women
  • Women in childbearing age who cannot use contraceptive methods during study participation
  • Is concurrently involved in other clinical trials in which receiving an investigational vaccine or study drug as part of study participation
  • Have any condition that, in the opinion of the site investigator, would compromise the subject's ability to participate in the study

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Interventions

BIOLOGICALInactivated hepatitis A vaccine (I-HAV)

A formaldehyde-inactivated hepatitis A virus (HM175 hepatitis A virus strain) Dose and administration: 0.5 mL intramuscular injection for participants age \<=18 years, and 1.0 mL intramuscular injection for participants age 19 years and above.


Locations(1)

Department of Pediatrics, Faculty of Medicine, Chiang Mai University

Chiang Mai, Thailand

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NCT06978621


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