Validated vaccine status
In phase IV, the staff of the six District Health Offices were supplied with a list of the 5,900 phase I treated participants and of the approximately 1,101 participants who made up the spillover sample from phase III. This list included names, village, address if available and telephone numbers. Health officials were blinded to the treatment status of the individuals on the lists that we provided for each District Health Office. The District Health Offices returned a list indicating: (1) whether each of the trial participants had received at least one dose of a COVID-19 vaccine; (2) when they received their first dose; and (3) if the information was not available in the District Health Office. In addition to indicating ‘yes’ or ‘no’ and date of first vaccination, District Health Office staff also indicated ‘no information’ or ‘N/A’. We only include in the final sample, used for the analysis, individuals who received either a ‘yes’ or a ‘no’. Note that the two cash treatments specified that individuals would receive a cash payment if they received a vaccination within the next 6 weeks. Accordingly, for the analysis reported in the text, trial participants who were vaccinated after April 2022, which is approximately 2 months after the video intervention, are coded as ‘no’. These verified vaccination data were obtained in phase IV during the period 15 October to 30 November 2022.