A longitudinal study finds that older adults who recovered from COVID-19 mount weakened non-spike-specific Th1 CD4+ T cell ...

New research from scientists at La Jolla Institute for Immunology (LJI) suggests people who received COVID-19 vaccines and then experienced "breakthrough" infections are especially well armed against ...

Preliminary data suggests the omicron variant may be more likely to cause infections among vaccinated people. The CDC forecasts that the new wave of COVID cases could top previous peaks by January as ...

A genetic testing technique that helped identify the COVID-19 virus is increasingly being used to diagnose difficult ...

More than 99.99% of people fully vaccinated against Covid-19 have not had a breakthrough case resulting in hospitalization or death, according to the latest data from the US Centers for Disease ...

Researchers discovered that people who experienced symptomatic breakthrough infections develop T cells that are better at recognizing and targeting SARS-CoV-2, including the Omicron and Delta variants ...

The CDC forecasts that the new wave of COVID cases could top previous peaks by January as the demand for at-home test surges. AP Photo/Matt Rourke NEW YORK -- As Americans brace for the possibility of ...