ASSOCIATION OF STATE AND TERRITORIAL HEALTH OFFICERS (A.S.T.H.O.) Immunization Registries Policy 1.3.6 Registries A.S.T.H.O. supports continued development of immunization of registries and tracking systems which have the potential to be linked. With the Council for State and Territorial Epidemiologists (C.S.T.E.), A.S.T.H.O. recommends that the C.D.C National Immunization Program take a lead role in establishing standards for data exchange and a method for unique patient identification, working with state and local agencies to develop population-based registries and coordinating with other federal agencies. C.D.C. should support evaluation and research activities. Immunization registries officer the best source of accurate, real-time data on immunization levels and enhanced linkage between immunization programs and other health and welfare programs (federal, state, and local) and private sector partners.