The threat level has been raised from substantial to severe, the second highest threat level meaning an attack is considered highly likely, but not imminent.

威胁水平已经从重大提升至严重，仅次于最高威胁水平。这意味着袭击是极有可能的，但不是即将发生的。

In these environments, where TB posed an especially high threat, those individuals who were not carriers of any genetic protection would have been more likely to die.

在这些环境中， 结核病构成特别高的威胁，那些没有任何基因保护的携带者更有可能死亡。