If more people are vaccinated in a community, it's harder for viruses to spread from person to person.

如果社会上有很多人接种，人到人的病毒传播就很困难。

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Other factors include whether it causes disease, its mode of transmission, whether it can spread from person to person and whether it has spread to urban areas - via blood transfusions, for example.

其他因素包括它是否会致病、它的传播模式、它是否能在人与人之间传播以及它是否会传播到城市(例如通过输血)等等。

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Many experts worry that the virus could kill large Numbers worldwide if it starts to spread easily from person to person.

许多专家开始担忧，如果禽流感病毒能随意在人群传播的话，那么禽流感将夺取许多人的生命。

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But experts say non-communicable diseases -- those that do not spread from person to person -- are the leading killer today.

VOA: special.2011.05.11

I want to end this premise idea by talking a little bit about a person for whom, one of the chief purpose in life was to spread happiness-- Mahatma Gandhi. This is a story about him.

我想以介绍一位,一生致力于，传播快乐的人来结论这个前提-,圣雄甘地，这是关于他的一个故事。

哈佛公开课 - 幸福课课程节选

As we'll see in section today, a vaccine does not have to be totally perfect in order to prevent transmission of a disease, because when a disease enters a community its spread from one person to another.

有如我们今天看到的,疫苗不一定非要,绝对完美地阻止疾病的传播,因为当疾病侵入一个社区后,会在人群间传播

耶鲁公开课 - 生物医学工程探索课程节选

Direct, person-to-person spread of anthrax is extremely unlikely.

CNN: Ten things you need to know about anthrax

Researchers are trying to determine if the virus will be a "dead end" infection which can spread only from animal to person, like rabies, or will be able to spread from one person to another like HIV after it made the jump from primates.

BBC: New coronavirus: May be 'bat bug'

In fact, her sister, Alivia Kropp, was the first person to spread the word and encourage her to speak out.

CNN: STORY HIGHLIGHTS