Table 2. The age-specific anti-HBs disappearance rate depending on the types of vaccine.
| Age, yr | Group A | Group B | ||||
|---|---|---|---|---|---|---|
| No. of individuals in whom > 2 times of test | No. of individuals with anti-HBs disappearance | Anti-HBs disappearance rate, % | No. of individuals in whom > 2 times of test | No. of individuals with anti-HBs disappearance | Anti-HBs disappearance rate, % | |
| 1 | 12 | 1 | 8.3 | 23 | 4 | 17.4 |
| 2 | 12 | 3 | 25.0 | 12 | 1 | 8.3 |
| 3 | 14 | 4 | 28.6 | 12 | 2 | 16.7 |
| 4 | 26 | 3 | 11.5 | 17 | 9 | 52.9 |
| 5 | 28 | 8 | 28.6 | 10 | 4 | 40.0 |
| 6 | 27 | 9 | 33.3 | 11 | 2 | 18.2 |
| 7 | 15 | 4 | 26.7 | 14 | 5 | 35.7 |
| Total | 134 | 32 | 23.9 | 99 | 27 | 27.3 |
Group A: the children born before 2005 (vaccination with plasma-derived vaccine or recombinant DNA vaccine); Group B: the children born after 2005 (vaccinated with recombinant DNA vaccine, by the national regulation since 2005).
Anti-HBs = antibody to hepatitis B surface antigen.