When will the U.S. reach herd immunity? What about California? Or the world? We asked four doctors to define herd immunity and estimate when we might get there with COVID-19.

About 2.4 million people in the United States are now receiving Covid-19 vaccinations daily, but one medical expert thinks the nation may not reach herd immunity this year if more people can't be ...

What is herd immunity? And did it happen in California? A doctor shares his thoughts on this theory and what it would take for herd immunity to happen in the United States.

Will this thwart our efforts to get to herd immunity? Doctors say the more people get the vaccine, the closer we get to the end of this pandemic.

California could reach herd immunity by June 15, according to projections by doctors at UCSF.

With measles declared eliminated from the US in 2000 and national herd immunity strong, health experts have recommended that American children get two doses of the Measles, Mumps, and Rubella (MMR ...

KVUE compared the CDC's metric for "herd immunity" to the kindergarten vaccination rates for local public school districts and private schools.