Herd immunity went from a phrase most of us had never heard of to the thing we're all waiting for in just about a year's time. "It's kind of shorthand for back to normal," said Dr. Bob Wachter, chair ...

Herd immunity occurs when enough people in a group are immune to a specific infection that it cannot spread easily from person to person. Vaccination programs have been successful in creating herd ...

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 ...

Some health experts say herd immunity is achievable, though difficult — but others are warning that it may not be possible when it comes to Covid-19. An article in Nature last month outlined five ...