Definition
For children born in the 3 to 5 years before the survey, VACYELLOWFEV indicates whether the child has received a vaccination against yellow fever. The CDC website [URL omitted from DDI.] reports that a single dose of the vaccination protects against yellow fever for 10 years or more, with a booster dose recommended every 10 years. This vaccination is recommended for persons age 9 months or older who live in areas at risk of yellow fever transmission.
VACYELLOWFEV uses composite coding, with a first digit of 2 indicating the child had 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).