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1·Younger people, however, had no such protective immunity.

而较年轻的人则无此种免疫保护。

2·The mechanism of its inducing protective immunity needs to be studied further.

其诱导保护性免疫的机制尚待进一步研究。

3·Several experiments showed that the particles could induce protective immunity.

很多实验显示，这些颗粒可以诱发保护性免疫。

4·Since humans haven't encountered the new virus before, they have little protective immunity.

由于人类在这之前没有遭遇这样的新病毒，他们的保护性免疫能力就很差。

5·Protective immunity against RSV infection after infection only last several months, so that reinfection often occurred.

感染后保护性免疫仅能持续数月，再感染经常发生。

6·This article introduced the new developments on the study of protective immunity of T. spiralis newborn larvae antigens.

本文介绍了旋毛虫新生幼虫抗原保护性免疫研究的新进展。

7·Objective To explore protective immunity effect against Capillaria hepatica infection induced by soluble egg antigen (SEA) in rats.

目的探讨肝毛细线虫虫卵可溶性抗原(SEA)诱导保护性免疫的效果。

8·AIM: To observe the level of immune responses and protective immunity in mice induced by laser-irradiated Toxoplasma tachyzoites (LIT).

目的：探讨激光照射弓形虫速殖子(LIT)的免疫保护力及其诱导的免疫应答水平。

9·Mice infected with rodent malaria parasites may provide a valuable animal model for dissecting protective immunity against human malaria.

啮齿类疟原虫感染小鼠为深入探讨抗人疟保护性免疫应答机制，提供了一种宝贵的实验动物模型。

10·Recently published studies indicate that 20-40% of populations in some areas have been infected by the H1N1 virus and thus have some level of protective immunity.

最近发布的研究报告显示，一些地区20 - 40%的人口曾感染过H1N1病毒，因此具有一定免疫力。