The government in Han Dynasty adopted the immigration policy foconsolidating frontier defense, garrison the origin distribution of the various counties Han, garrison Wide variety of work and the more onerous.and many garrisons moved to the border area. Beacause of the changes in living habitat, it is inevitable that they would be infected with diseases and die. While several reasons contribute to this. First, it is because of the severeness of the natural environment in the northwest. In addition, it lay in the changes of the diet structure which caused the loss of protein, amino and some other necessary nutrients for human, and finally resulted in the suppressed immunity. All these factors lead to the diseases of typhoid and bloating. |