在线英语听力室_免费在线英语听力学习网站

This is Scientific American — 60-Second Science. I'm Lucy Huang.

It's peak cold and flu season, which means taking a lot of preventative measures. Frequent hand-washing is a must. As is avoiding co-workers or friends who are sick. But we humans are not the only animals that change behavior to keep diseases a???t bay. So do ants.

"So there are the foragers and the nurses — it's two different groups of work."

Nathalie Stroeymeyt of the University of Lausanne. She and colleagues observed ants to see their reaction to the presence of a pathogen.

"With the nurses staying inside the nurse taking care of the brood and being made of young workers typically. And the foragers are all the workers at outside of the nest to collect food and defend the territory."

Forager¹ ants are at greater risk of ge?tting exposed to diseases because they leave the safety of the nest. So the researchers sprayed a common fungus² on a small group of forager ants and then followed their movements to see the way other ants reacted.

"We marked all ants in the colony with individual labels, which carries these two-dimensional bar code marks like QR code which is automatically detected and recorded using a tracking system."

After the infection, the nurse and forager ants stayed within their cliques³ and interacted less outside of their work group. The researchers also saw that forager ants spent more time outside of the nest.

"They increase that amount by 15 percent so by quite a long large amount."

The researchers also measured the amount of fungus on each ant and saw that it was almost completely contained to the foragers group. Some nurse ants and even the Queen did have trace amounts of the fungus' spores⁴ on them but the amount was small enough that they could easily groom⁵ them off of their bodies. The study is in the journal Science.

Not only does the cliquish⁶ behavior stop the spread of the fungus, "but it allows you to develop immunization. Something that's quite interesting in these ants that's been shown by other study is that when you receive very small amount of these spores, you don't have an increase in mortality risk because it's low enough that you can heal, it's sort of boost your immune defenses and protect you against later exposure to the same pathogen."

Seems that in their ability to avoid infecting other members of the community, ants may be more advanced than we are.

Thanks for listening for Scientific American — 60-Second Science. I'm Lucy Huang.