保护期至少持续20年，应为终身免疫。
自然经过的麻疹，一般产生终身免疫。
An unmodified attack of measles usually confers lifelong immunity.
人们认为一旦感染一次感冒就能终身免疫，这是错误的。
People think that once you get infected one time you develop immunity for the rest of your life. This is wrong.
一旦你得了这种病，你就会对这种病终身免疫。
Once you've had the disease, you will be immune to it for life.
被四种可以导致登革热的病毒中的任一种病毒感染的人可以获得终身免疫。
Anyone who survives an infection by one of the four viruses that cause the disease gains lifelong immunity from that virus.
建立了带有潜伏期及终身免疫的SARS流行病的SE IR动力学模型。
SEIR dynamic model of SARS epidemic with a latent period and permanent immune is established.
寻求一劳永逸的流感疫苗——打一针就能终身免疫的努力已经进行了几十年。许多研究团队都致力于此。
The hunt for a universal flu vaccine, a single shot that would provide lifelong immunity, has been going on for decades, and many teams of researchers have been on the case.
在本文中，考虑到传染病对宿主生物群体生长动力学的影响，对终身免疫型传染病的动力学建立了一个偏微分方程的模型。
In this paper, regarding the influence of infectious diseases on the dynamics of host population growth, a PDE model is established for the dynamics of infectious diseases with lifelong immunity.
人们最大的目标当然是要制止这种疾病，最有效的方法是预防，最理想的技术应该是只要通过一剂疫苗便可以给人们带来终身免疫能力。
The broad goal, of course, is to end the disease. The highest-leverage approach is prevention. The ideal technology would be a vaccine that gives lifetime immunity with a single dose.
人们最大的目标当然是要制止这种疾病，最有效的方法是预防，最理想的技术应该是只要通过一剂疫苗便可以给人们带来终身免疫能力。
The broad goal, of course, is to end the disease. The highest-leverage approach is prevention. The ideal technology would be a vaccine that gives lifetime immunity with a single dose.
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