实验种群中初期死亡率较低，5龄幼虫和蛹的死亡率较高。

In experimental populations, mortalities of the 5th instar larvae and pupae were higher than those of instars at initial stages.

youdao

治疗中的副作用也可以减轻。这很重要，因为我们知道死亡率高主要是由于感染者没有得到初期治疗。

And you can reduce also the side effects, which is very important because we know that the death rate is mainly higher when people are not put early on treatment.

youdao

在以前的暴发中，疾病初期势头凶猛，死亡率高，几个月后逐渐减弱，未留下从何处来的痕迹。

In the previous outbreaks, the disease struck with initial ferocity causing massive fatalities, then faded away months later without leaving a hint where it came from.

youdao