• Ongoing study to estimate the effect of HCW education and switch to 5-dose vials on measles coverage. • Secondary and tertiary aims include estimating the effect on intervention timelines, caregiver attitudes, and wastage and cost. • Baseline survey found that: — 23% of parents reported they were turned away for measles vaccination and the primary reason was that not enough children were present — 69% of healthcare providers reported turning away children for measles vaccination because they came on a non-measles vaccination day — 59% of providers preferred a 5-dose vial.