Caregiver recall in childhood vaccination surveys: Systematic review of recall quality and use in low- and middle-income settings

There are quality concerns with caregiver recall and difficulty in assessing it given the lack of a 'gold standard' for vaccine status. To improve coverage estimates and the impact of vaccines, caregiver recall should be used. Other recommendations include: recall is included for those presenting vaccine records; missing data is imputed; recall and record quality are assessed in a sub-sample; and sensitivity analyses are performed.