Modeling the Long-term Antibody Response and Duration of Immune Protection Induced by an Inactivated, Preservative-free Hepatitis A Vaccine (Healive) in Children.

Yong Pei YU; Jiang Ting Chen; Zhi Wei Jiang; Ling Wang; Cheng Kai YU; Xiao Yan Yan; Chen Yao; Jie Lai Xia

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Modeling the Long-term Antibody Response and Duration of Immune Protection Induced by an Inactivated, Preservative-free Hepatitis A Vaccine (Healive) in Children.

Author: Yong Pei YU ^{1
,

2} ; Jiang Ting CHEN ³ ; Zhi Wei JIANG ⁴ ; Ling WANG ⁵ ; Cheng Kai YU ⁵ ; Xiao Yan YAN ² ; Chen YAO ² ; Jie Lai XIA ⁵
Author Information

1. College of Military Preventive Medicine, the Fourth Military Medical University, Xi'an 710032, Shaanxi, China
2. Peking University Clinical Research Institute, Peking University Health Science Center, Beijing 100191, China.
3. Sinovac Biotech, Beijing 100089, China.
4. Beijing Keytech Statistical Consulting, Beijing 100020, China.
5. College of Military Preventive Medicine, the Fourth Military Medical University, Xi'an 710032, Shaanxi, China.
Publication Type:Journal Article
Keywords: Antibody persistence; Hepatitis A; Inactivated hepatitis A vaccine; Long-term follow-up; Modeling
MeSH: Adolescent; Child; Child, Preschool; China; Female; Hepatitis A; immunology; Hepatitis A Antibodies; blood; Hepatitis A Vaccines; administration & dosage; Humans; Immunity, Active; Infant; Male; Models, Statistical; Vaccination; statistics & numerical data
From: Biomedical and Environmental Sciences 2020;33(7):484-492
CountryChina
Language:English
Abstract: Objective:Long-term seroprotection the hepatitis A vaccine is essential for the prevention of disease from the hepatitis A virus (HAV). Due to documented difficulties during decade-long follow-ups after receiving vaccines, statistical-modeling approaches have been applied to predict the duration of immune protection.
Methods:Based on five-year follow-up data from a randomized positive-controlled trial among Chinese children (1-8 years old) following a 0, 6 months vaccination schedule, a power-law model accounting for the kinetics of B-cell turnover, as well as a modified power-law model considering a memory-B-cell subpopulation, were fitted to predict the long-term immune responses induced by HAV vaccination (Healive or Havrix). Anti-HAV levels of each individual and seroconversion rates up to 30 years after vaccination were predicted.
Results:A total of 375 participants who completed the two-dose vaccination were included in the analysis. Both models predicted that, over a life-long period, participants vaccinated with Healive would have close but slightly higher antibody titers than those of participants vaccinated with Havrix. Additionally, consistent with previous studies, more than 90% of participants were predicted to maintain seroconversion for at least 30 years. Moreover, the modified power-law model predicted that the antibody titers would reach a plateau level after nearly 15 years post-vaccination.
Conclusions:Based on the results of our modeling, Healive may adequately induce long-term immune responses following a 0, 6 months vaccination schedule in children induction of memory B cells to provide stable and durable immune protection.