All hypotheses on how the COVID-19 pandemic began remain open, the World Health Organization said Friday, following an inconclusive four-year investigation that was hamstrung by crucial information ...

When her school closed down in March 2020, Chimére Sweeney, an English teacher in Baltimore, thought she’d return to her students once the U.S. got a handle on the new SARS-CoV-2 virus. But “life had ...

The study found that the vaccine reduced the risk of emergency department visits and hospitalizations among healthy adults by about half last winter.

Changes in the vaccine advisory process in the United States have disrupted immunization guidance, which reinforces the need for independent evidence review to inform decisions regarding immunization ...

With the rise of omicron came the fall of long-lasting protection from reinfection with the pandemic coronavirus SARS-CoV-2, according to a study published in Nature. Using population-wide data from ...