The Helios FHIR Accelerator is exploring the application of the Bulk FHIR IG to a public health use case of allowing authorized users to access the immunization of history of patients associated with the authorized user making the query of the immunization program. This project is expected to develop guidance for applying the Bulk FHIR IG approach to this use case. Further refinement of profiles and resources may be necessary. Balloted and published material will likely take the form of a FHIR IG, however, other formats such as a whitepaper may be considered depending on the nature of the guidance necessary. Additional FHIR IGs such as the Da Vinci Member Attribution List (ATR) standard may also be considered for use during implementation.