军队是国家政权的重要组成部分,但军队因人员密集、换防、战争和自然灾害等因素,很容易引起重大传染病的发生和流行。两宋时期,随着辽、夏、金等少数民族政权在北方的崛起,宋代中央政府在北方地区的活动受到限制,开始从汉唐时期传统的经略北方转向关注南方地区的开发。在这一转 The army is an important part of the state power. However, due to factors such as heavy personnel, exchange of arms, war and natural disasters, the army can easily lead to the occurrence and prevalence of major infectious diseases. During the Song and Song dynasties, with the rise of ethnic minorities such as Liao, Xia and Jin in the north, the central government in Song dynasty restricted its activities in the north and began to turn its attention from the traditional economy of northern China to that of the south during the Han and Tang dynasties. At this turn