Definition
For children born in the 3 to 5 years before the survey, VACOPVB indicates whether the child has received a booster dose of an oral polio vaccination. The booster dose is an extra vaccination after an earlier primary dose or series.
The oral polio vaccination primary series usually consists of a birth dose and 3 additional administrations. The variables VACOPV0 (H0), VACOPV1 (H4), VACOPV2 (H6), and VACOPV3 (H8) report the birth, first, second, and third administrations, respectively.
VACOPVB uses composite coding, with a first digit of 2 indicating the child has been vaccinated and the second digit indicating the source of information (a dated entry on the vaccination card, an undated mark on the vaccination card, or the mother's report).