Herd immunity means that more people are immune to a contagious disease than the amount that can be infected. Here's how it ...

RALEIGH, N.C. (WTVD) -- Dr. Betsey Tilson serves as the State Health Director and the Chief Medical Officer for the Department of Health and Human Services. On Wednesday, she joined ABC11 to discuss ...

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 ...

New York state has half the population of California but has experienced 14 times as many deaths from novel coronavirus. RELATED: Californians may have developed some herd immunity to coronavirus last ...

An infectious disease specialist took the time to explain what herd immunity is, how it works and when it might affect the spread of COVID-19. Dr. Frank Esper works for the Cleveland Clinic Children's ...

SAN FRANCISCO -- It's a story that has been making headlines across the United States: Did Californians develop herd immunity after possibly being exposed to novel coronavirus last year? On Thursday, ...

HOUSTON, Texas (KTRK) -- More than half of adults in Harris County have had a least one dose of the vaccine. In Fort Bend County, it's at least 60%. Still, we are starting to see demand for the ...

HOUSTON, Texas (KTRK) -- At large vaccination sites, like the one in Galveston County where staff is administering up to 5,000 vaccinations a day, the hard work is paying off. Galveston County is ...

A nearly COVID-free summer has long been the goal of public health officials who are striving to get enough people vaccinated by then to achieve so-called herd immunity. But is that a realistic goal? ...

In terms of overall herd immunity, the impacts at this stage may be relatively small. But measles immunity gaps are much greater in some parts of Australia, such as the north coast of New South Wales ...