No single authority runs global health. WHO sets norms and coordinates response, UNICEF and Gavi handle procurement and financing for immunisation, multilateral funds, development banks, foundations and NGOs each hold part of the money and part of the agenda, and states retain sovereignty over what happens inside their borders.
Our coverage takes the structure seriously, because fragmentation, donor-driven priority setting and asymmetries of power are among the field's most persistent and best-documented criticisms.
Global health explained: definition, how it differs from international and public health, key actors, financing, major priorities and persistent structural challenges.
How outbreaks are detected and controlled: surveillance systems, verification, epidemiological investigation, IHR obligations, containment measures and response gaps.
How global immunization programs work: herd immunity, cold chain, delivery systems, WHO and Gavi roles, vaccine safety monitoring and barriers to coverage.