TABLE 7.
Population-based studies comparing the prevalence of chronic HBV infection in children born before and after the introduction of hepatitis B vaccine into infant immunization schedules
| Location (reference) | No. testeda | Age (yr) at testing | Vaccine coverage (%) | % with chronic HBV infection
|
|
|---|---|---|---|---|---|
| Before program | After program | ||||
| Alaska (57) | 268 | 1–10 | 96 | 16 | 0 |
| Taiwan (21) | 424 | 7–10 | 73 | 10 | 1.1 |
| Samoa | 435 | 7–8 | 87 | 7 | 0.5 |
| Indonesia (138) | 2519 | 4 | >90 | 6.2 | 1.9 |
| Pacific (107) | 200 | 3–4 | 94 | 9 | 0.5 |
| Micronesia (107) | 364 | 3–4 | 82 | NAb | 1.1 |
| Micronesia (107) | 544 | 2 | 37 | 12 | 3 |
| Polynesia (121) | 582 | 1–2 | 66 | 6.5 | 0.7 |
a
Number of children tested in follow-up seroprevalence surveys at the age indicated.
b
NA, data not available.