前言结核病的预防已经证明卡介苗接种是最有效的方法,不过它的预防作用,仅对于未受感染结核菌的儿童和青年接种有效。对于已经受过结核菌感染的,就不能发生作用。受过结核菌感染的人,在当时或以后都有发生结核病的可能。据统计一百个受感染的人,发病的约有三、四人。感染的年龄愈小,发病的机会愈大。如果儿童的抵抗力很弱,发病后的症状也就严重,并且容易引起血行播散和结核性脑膜炎,造成很高的死亡率。因此如何使感染后不发病而仍然能保持对结核病的抵抗力,这是一个比较复杂而饶有兴趣的问题。结核病的化学药物预防,就是服用化学制菌药物预防结核病的发生,这是结核病预防的 Preventive The prevention of tuberculosis has proved that BCG vaccination is the most effective method, but its preventive effect is effective only for children and young adults without TB infection. For those who have been infected with Mycobacterium tuberculosis, can not play a role. Those who have been infected with Mycobacterium tuberculosis have the possibility of developing tuberculosis at that time or later. According to the statistics of one hundred infected people, the incidence is about three or four people. The smaller the age of infection, the greater the chance of onset. If the child’s resistance is weak, the symptoms after the onset will be serious, and easily lead to hematogenous dissemination and tuberculous meningitis, resulting in high mortality. Therefore, it is a rather complicated and interesting issue how to keep the resistance to TB disease after infection. Prevention of tuberculosis chemical drugs, that is, taking chemical antibiotics to prevent the occurrence of tuberculosis, which is tuberculosis prevention