It's not clear whether they were infectious.

病的传染性还不而知。

Old and new diseases compound each other.

传统的传染性疾病与近来的非传染性疾病同时困扰着发展中国家。

Some of the mutations have been associated with higher transmissibility.

其中一些突变可能会有更高的传染性。

Supporters of contact tracing, which include the director of the U.S. Centers for Disease Control, say the process is fundamental for controlling the spread of communicable diseases, like coronavirus.

包括美国疾病控制中心主任在内的接触者追踪技术的支持者们，他们认为这一方法能有效控制传染性疾病的传播，比如冠状病。

I-I-I basically mixed this with a more contagious flu virus.

我加入了一种更具传染性的流感病。

The atmosphere of feverish excitement was highly infectious; Harry couldn't stop grinning.

这种狂热的兴奋情绪是很有传染性的，哈利也忍不住不拢嘴。

So, to recap: Cholera is a contagious, severe gastroenteritis caused by the gram-negative Vibrio cholerae bacteria.

！快速回顾一下：霍乱是一种由革兰氏阴性霍乱弧菌引起的具有传染性的、严重的胃肠炎。

They're not certain how contagious people are when they get it.

当有人感染时，他们也不能确定这些感染者的传染性有多强。

That was reportedly twice as contagious as previous versions of it.

据报道，变异株的传染性是普通冠状病的两倍。

Health officials say it's far more contagious than previous strains of COVID, but most medical officials also say that existing COVID vaccines are effective in preventing people from being hospitalized from the " Delta variant" .

卫生官员表示，这种病的传染性远远超过以往的新冠病菌株，但大多数医疗官员也表示，现有的新冠病疫苗可以有效防止感染" 德尔塔变异株" 的人病情加重住院。

It's the most contagious behaviour-it's meant to be automatic, it's something that you can't stop.

它是最具有传染性的行为——它本该是自发的，它是你无法阻止的。

Now despite this good news, President Biden has extended the travel restrictions to the U.S. to include South Africa which has been dealing with a dramatic second wave pushed by this more transmissible variant.

尽管有了这个好消息，拜登总统还是将旅行限制扩大到全美，包括南非，南非正在应对这种更具传染性的病所引发的第二轮疫情。

Health officials say it's extraordinarily contagious, more so than other versions of COVID-19.

卫生官员称，奥密克戎相比其它新冠病变异株，传染性要强的多。

Measles as a virus is one of the most contagious infections that there is.

" 麻疹病是传染性最高的病之一。

Top of that list, Togo, which became the first country to eliminate four of those diseases, including trachoma, the world's most common infectious cause of blindness.

第一名，多哥，拔头筹，消灭了 4 种疾病，包括沙眼，世界上最普遍的传染性致盲病因。

This lab belongs to Alexander Fleming, a Scottish scientist investigating the properties of infectious bacteria.

该实验室属于亚历山大·弗莱明（Alexander Fleming），他是苏格兰科学家，负责研究传染性细菌的特性。

What is unclear is how infectious these people actually are.

现在还不清楚这些人到底有多大的传染性。

This is another term for measles, a contagious virus that's characterized by a skin rash.

Measles是麻疹的另一种说法，这是一种会引发皮疹的传染性病。

It is not known for causing illness but it is very contagious.

虽然不知道它会导致疾病，但它的传染性很强。

Measles, the incredibly contagious disease, is on the rise in the U.S.

麻疹是一种极其具有传染性的疾病，在美国呈上升趋势。