It is the policy of the United States as a whole as well as the indivi
dual states themselves that children receive the appropriate immunizat
ions at the proper ages. Public health officials in Oklahoma used a ma
rketing campaign to increase the likelihood that parents would have th
eir children immunized by age two. The Due By Two campaign, spearheade
d by the Oklahoma's first lady, Rhonda Walters, was a unique part of a
nationwide effort aimed at increasing childhood immunization rates. T
he authors examine the results achieved and the cost involved in the O
klahoma campaign.