In those cases, the children are considered protected by so-called herd immunity.

In such cases, those children would be protected by what health specialists call "herd immunity."

The game is noteworthy due to its use in teaching notions of herd immunity.

The eradication program was based on a concept known as herd immunity.

The higher the herd immunity, the more mosquitoes necessary to start an epidemic.

It would make things more difficult for the bad guys, almost providing a kind of herd immunity.

Unfortunately, the idea of herd immunity has lost respect.

The population born over the last two decades has a low herd immunity and therefore more susceptible to the virus.

This second group needed herd immunity to protect them from these dangerous diseases.

Read more about herd immunity - and why some people don't believe in the wisdom of crowds - on the next page.