And thanks to these efforts in different countries, wild smallpox viruses have been wiped off the face of the planet!

由于不同国家的努力，野生天花病毒已经从地球上消失了！

When the boy had recovered, Jenner returned with a new blade-this one coated with the microbial matter of the smallpox virus.

当这位男孩康复后，詹纳带着一把新刀回来了——这把刀上涂有水痘病毒的微生物物质。

And so, each outbreak was encircled by people who were immune to the smallpox virus and wouldn't let it pass through them.

因此，每次疫情爆发，那些对天花病毒形成免疫的人群就会形成环围，使这种病毒无法通过他们进行传播。

The kinds of pathogens used in a bioweapon can be reproduced from naturally occurring ones, like the viruses that cause smallpox viruses or bacteria that cause anthrax and cholera.

生物武器中使用的病原体可以从自然发生的病原体中复制出来，如导致天花病毒的病毒或导致炭疽和霍乱的细菌。

Which means that virologists are going to have to rethink their timelines for how the smallpox virus evolved and spread through the world, all because of what was found on one child who died a few hundred years ago.

这意味着病毒学家将不得不重新考虑天花病毒如何进化和在世界范围内传播的时间表，这一切都是因为在一个几百年前死去的孩子身上发现了什么。