Younger people, however, had no such protective immunity.
而较年轻的人则无此种免疫保护。
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。
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。
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。
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