但是，其中十分之一的人在一生中某一天会成为活动性结核病患者，主要原因是其免疫力减弱。
However, one in 10 will become sick with active TB in his or her lifetime due primarily to a weakened immune system.
裂谷热症状通常持续4至7天，此后通过抗体出现即可检出免疫反应，血液中的病毒也随之逐渐消失。
The symptoms of RVF usually last from four to seven days, after which time the immune response becomes detectable with the appearance of antibodies and the virus gradually disappears from the blood.
约两个月前，他们接受了第一次甲流疫苗接种；21天后，超过85%的志愿者对这种新型流感病毒菌株显示出了免疫力。
They got their first shot to test the vaccine about two months ago, and, after 21 days, more than 85 percent showed an immunity to this novel flu strain.
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