Nature Immunology, Published online: 14 August 2026; doi:10.1038/s41590-026-02623-2 In the context of a Public Health Emergency of International Concern, such as the Bundibugyo virus outbreak, the research community requires rapid access to information to guide an effective response. Evidence mapping brings together the available knowledge in a field into a single, organized resource, enabling researchers to rapidly identify priorities, gaps and opportunities for action.