This study invited health visitors and practice nurses who give advice about childhood immunisation or administrer vaccines to complete a questionnaire about the immunisation research sources they use and how they communicate this with parents. The questionnaire was part of the larger study that aimed to develop a resource for primary health care professionals to use and help them communicate research evidence. This Record is a digital tombstone. The data files associated with this record were destroyed/deleted on the 17 April 2026 in line with the approved retention schedule.