More than 95% of cases are self-limited with clearance of virus and immunity to reinfection.

超过95%的病例是自限性清除病毒，并且对再次感染免疫。

youdao

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。

youdao

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。

youdao