Access to safe water and sanitation, childhood nutrition programmes, the introduction of health education into school curricula, and expansion in the reach of immunization programmes have also played a role.
获得安全饮用水和公共卫生、儿童营养方案、把健康教育纳入学校课程以及免疫方案覆盖范围的扩大等因素也发挥了作用。