Time to infect

Ebola was so deadly and killed so quickly that within a short period of time, there was no one around to infect.

埃博拉病毒十分致命，致死速度极快，以至于在短时间内，周围没有健康的人可以再被病毒感染。

For a while it might be able to make new viruses that could re-infect the same cell, but over enough time, the viruses would become disabled.

有时也可能产生新的病毒，再次感染同一细胞，但在足够长的时间里，该病毒将会失去感染力。

Sick employees don't just affect their own work; they infect coworkers who then need to take time off themselves. (or who come in sick and spread the germs further.)

病了的员工不但影响到自己的工作，还会把病传染给同事们，随后他们也要去请假，或者继续上班，传播更多的病毒。