Immunogenicity of an inactivated hepatitis A vaccine in healthy children: two years' follow-up.
Journal
Zhonghua Minguo xiao er ke yi xue hui za zhi [Journal]. Zhonghua Minguo xiao er ke yi xue hui
Journal Volume
36
Journal Issue
5
Pages
331-335
Date Issued
1995
Author(s)
Abstract
To investigate the long-term immunogenicity of an inactivated hepatitis A vaccine in children, 100 healthy children, aged between 1 and 7 years old and all lacking the antibody to hepatitis A (HA) virus, were enrolled in this trial. They received 3 doses of strain HM 175 HA vaccine with 360 enzyme-linked immunosorbent assay (ELISA) units at 0, 1 and 6 months, respectively. Blood sampling for antibody and aminotransferases was performed 7 days before, then 1, 6, 7, 12, and 24 months after the first dose. The titers of antibody to HA virus were tested by radioimmunoassay and ELISA methods. All subjects became ELISA seropositive at Month 6 after two doses of vaccine. Except for one boy, 99 remained seropositive at Month 24, with a geometric mean titer of 1,148 mIU/ml. Antibody titers for females were significantly higher than those for males throughout the follow-up period. It was concluded that the inactivated HA vaccine used in the present trial was immunogenic and safe in children below seven years old. The vaccine-induced antibody persisted for at least two years in 99% of the vaccinees.
SDGs
Other Subjects
hepatitis A antibody; hepatitis A vaccine; hepatitis antibody; hepatitis vaccine; inactivated vaccine; article; blood; child; female; follow up; Hepatitis A virus; human; immunology; infant; male; newborn; preschool child; Child; Child, Preschool; Female; Follow-Up Studies; Hepatitis A Antibodies; Hepatitis A Vaccines; Hepatitis Antibodies; Hepatovirus; Humans; Infant; Infant, Newborn; Male; Vaccines, Inactivated; Viral Hepatitis Vaccines
Type
journal article