It's almost amusing to think of humans as part of a "herd" — a term that usually conjures up images of hoofed animals grazing in a field. Yet herd immunity is an important concept when it comes to ...

The idea of gaining “herd immunity” against COVID-19, meaning enough people will eventually be immune to SARS-CoV-2 to stop it from spreading, is starting to look unlikely, according to Nature. “We’re ...

As more and more of the United States population gets vaccinated against COVID-19, many are wondering: when will enough people be vaccinated for life to return to normal? That question doesn't have a ...

To stop the spread of an infectious disease like measles, you don’t have to vaccinate everyone. But you do have to vaccinate many. Just how many? To let you discover for yourself, we simulated an ...

You might have heard of herd or community immunity, when a vaccinated portion of a population (aka "the herd") provides unvaccinated people with some protection from a contagious disease. Thanks to ...