For solve this public health problem, universal salt iodisation (USI) is used to eliminate IDD and gains notable success, incidence of hypothyroid disease descends to low level.

• 目的:碘是一种人体必需的、对人类健康至关重要的微量元素,它是合成甲状腺激素的原料,因而具有重要的生理意义。