Such threats include the marketing and distribution of tobacco products, and the international spread of emerging and epidemic-prone diseases.

这些威胁包括推销和销售烟草制品，以及新出现的和有流行倾向的疾病的国际传播。

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This age group is the most economically productive part of the population, and if the epidemic continues to spread through that age group, there will be serious economic consequences in the future.

上述年龄组别人群是最具经济活力的人群，因此如果艾滋病继续在这一群体中传播，将会造成严重的经济后果。

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The us went on high alert and vaccinated thousands of people - but the virus did not spread readily enough to maintain an epidemic, and fizzled out.

当时美国给予高度关注，并给好几千人注射了预防针，但这种病毒并没有迅速扩散，没有构成流行病，后来也就慢慢消失了。

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If we maintain what is called "herd immunity", then even if there is an outbreak, it will not spread and become an epidemic.

BBC: Steve Jobs waits on stage, AP

The war killed civilians as well, as battles raged across farm and field, as encampments of troops spread epidemic disease, as guerrillas ensnared women and even children in violence and reprisals, as draft rioters targeted innocent citizens, as shortages of food in parts of the South brought starvation.

NPR: 'Republic of Suffering' Author Drew Gilpin Faust

Scientists think HIV probably crossed into humans as far back as the early 1900s, but it wasn't until air travel became common that the virus spread, and AIDS became a global epidemic in the 1980s.

CNN: Tracking deadly viruses' spread from animals to humans