The Earth Alliance Health Organization is a specialized agency of the Earth Alliance that acts as a coordinating authority on public health. It inherited the mandate and resources of its predecessors, the World Health Organization, an agency of the old United Nations and the Health Organization, which had been an agency of the League of Nations. In 2267 the E.A.H.O. was one of the several agencies to support the mission of the Excalibur and later hosted the "Plague Eradication Management Strategies Mars Conference".