The capsule is considered an important virulence factor since the strains that lack a capsule are less virulent.

荚膜被认为是重要的毒力因子，因为缺少荚膜的菌株毒力相对较弱。

This capsule is a major virulence factor because of its antiphagocytic ability.

荚膜具有抗吞噬的，所以是其主要的毒力因子。

Now coronaviruses that circulate among the humans are typically benign, and they cause a quarter of all common cold illnesses.

通常情况下，人与人之间传播的是毒力相对弱的冠状病毒，占普通感冒病因的1/4。

Some bacteria can also have another extra layer on top of the cell wall called a capsule, which is a major virulence factor.

一些细菌还有包裹在细胞壁外面的荚膜，是主要的毒力因子。

H. pylori can make over 1,500 proteins, many of which are dedicated to maximizing its virulence.

幽门螺杆菌可以制造 1, 500 多种蛋白质，其中许多专门于最大限度地发挥其毒力。

Now, Klebsiella pneumoniae has a number of virulence factors that are like assault weaponry that help it attack and destroy the host cells and evade the immune system.

肺炎克雷伯杆菌具有多种毒力，可以攻击宿主细胞，并逃避免疫。

It has a bunch of virulence factors such as capsule, LPS, pili, and a siderophore, which helps the bacteria to attack and destroy the host cells and evade the immune system.

它具有多种毒力因子，如荚膜、脂多糖、菌毛以及铁载体；铁载体帮助细菌攻击宿主，破坏机体细胞，并逃避人体免疫。

When the typhus fever had fulfilled its mission of devastation at Lowood, it gradually disappeared from thence; but not till its virulence and the number of its victims had drawn public attention on the school.

斑疹伤寒在洛伍德完成了毁灭性的使命后，便逐渐从那里消失了。但直到它的毒力和受害者的数量引起了公众对学校的关注。