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As a number of western nations, including the United States, wind down stay at home orders, the World Health Organization said on Monday that attempting herd immunity without a vaccine is a “dangerous ...

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 ...

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 ...

Drivers line up at the entrance of Montgomery County's first mass coronavirus test center in Upper Dublin Township on March 20, 2020. (U.S. Air National Guard photo by Senior Airman Wil Acosta) “Herd ...

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 ...