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 ...

Updated 2024-2025 COVID-19 vaccines significantly reduced the risk for hospitalization and severe outcomes despite the emergence of new viral lineages.

Covid-19 was never just another cold. We knew it was going to stick around and keep changing to try to get the upper hand on our immune systems. But we've changed, too. Our B cells and T cells, ...

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 ...

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, ...

The immune systems of some people who have not been exposed to the novel coronavirus could have some familiarity with the pathogen -- possibly helping to reduce the severity of illness if that person ...

People’s immune responses to COVID-19 after inoculation were lower among those who were previously infected with SARS-CoV-2 than those who were not, according to a study the National Institutes of ...

Most people have put the COVID-19 pandemic behind them. Infections, vaccinations, or a combination of both have bolstered people's immunity, and while new variants continue to pop up, getting sick ...