Reappraisal of the Immunogenicity and Safety of Three Hepatitis A Vaccines in Adolescents

Seo Hee Yoon, Han Wool Kim, Jong Gyun Ahn, In Tae Kim, Jong-Hyun Kim, Kyoung Ae Kong, Kyung-Hyo Kim, Seo Hee Yoon, Han Wool Kim, Jong Gyun Ahn, In Tae Kim, Jong-Hyun Kim, Kyoung Ae Kong, Kyung-Hyo Kim

Abstract

Although the overall incidence of hepatitis A in Korea has been decreasing, adolescents remain highly vulnerable to its outbreaks. This study was conducted to compare the immunogenicity and safety of three hepatitis A vaccines in Korean adolescents. Healthy anti-hepatitis A virus seronegative subjects aged 13 to 19 yr were randomized in three equal groups to receive two doses of Avaxim™, Epaxal®, or Havrix®, 6 to 12 months apart. Seroconversion rates one month after the first dose were 98%, 95%, and 93% for Avaxim™, Epaxal®, and Havrix®, respectively. Seroconversion rates reached 100% for all vaccine groups one month after the second dose. Anti-HAV geometric mean concentrations (GMCs) were 7,207.7 mIU/mL (95% CI, 6023.1-8684.7), 1,750.5 mIU/mL (95% CI, 1362.9-2248.3), and 1,953.5 mIU/mL (95% CI, 1459.4-2614.7) after two doses of Avaxim™, Epaxal®, and Havrix® respectively. Avaxim™ was significantly more immunogenic than Epaxal® and Havrix®, whereas there were no significant differences in antibody responses between Epaxal® and Havrix®. Local and systemic solicited adverse events (AEs) were mostly of mild-to-moderate intensity and resolved within 5 days. No serious AEs were reported. In conclusion, all three vaccines are highly immunogenic and well-tolerated in Korean adolescents. (Clinical Trial Registry NCT00483470).

Keywords: Adolescent; Antibody Formation; Hepatitis A Vaccines; Safety.

Conflict of interest statement

DISCLOSURE: The authors have no conflicts of interest to disclose regarding this study.

Figures

Fig. 1. Study design and disposition of…
Fig. 1. Study design and disposition of subjects. *Subjects were excluded due to ineligibility for the study. ITT, intention-to-treat; PP, per-protocol; P, pediatric dose; A, adult dose.
Fig. 2. Comparison of the immunogenicity of…
Fig. 2. Comparison of the immunogenicity of the three hepatitis A vaccines at each visit. (A) Comparison among the Vaccine A, Vaccine B, and Vaccine C groups. (B) Comparison among the subgroups with three pediatric doses of each vaccine. (C) Comparison between the subgroups with two adult doses of each vaccine. Visit 1, at enrollment; visit 2, one month after the first dose; visit 3, just prior to the second dose (6 to 12 months after the first dose); visit 4, one month following the second dose.
Fig. 3. Reverse cumulative distribution curves of…
Fig. 3. Reverse cumulative distribution curves of the anti-HAV antibody concentrations for the three vaccine groups at each visit. Vertical solid line, cut-off value for anti-HAV seroprotection, 20 mIU/mL.

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Source: PubMed

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