ABSTRACT
Over time, specific immunization schedules and policies, often quite different from those of industrialized countries (i.e., younger ages of administration), were established to optimize the uptake and impact of these vaccines in the developing country setting (12-14). It was in 1977, the year of the last case of smallpox (7), that the World Health Assembly (WHA) formally declared the EPI goal of delivering these six antigens to the world’s children by 1990 (15).
