Pandemic

Evidence suggests the outbreak is being caused by several known pathogens, the World Health Organization said.

Frail people and those with preexisting conditions were most likely to die from the 1918 flu — not young, healthy adults as once believed, a study of the victims' skeletons suggests.

An updated COVID-19 vaccine made by Novavax has been authorized by the FDA, joining the two vaccines already cleared for use.

Here's a look at the science behind SARS-CoV-2 variants, including the now-dominant omicron and its many defunct relatives.

Data shows that America's excess death rates have mostly returned to pre-pandemic levels, reflecting the end of the public health crisis, experts say.

In a large cohort of people infected with SARS-CoV-2, a specific gene variant was more common in people who didn't show symptoms, compared to those who did.

A mysterious epidemic that began in the Mediterranean at the start of the year looks set to wipe out all of the Mediterranean and Red Sea’s urchins, and possibly their coral reefs too.

The World Health Organization no longer considers COVID-19 a public health emergency of international concern and has brought an end to an emergency declaration that has been in place since January 2020.

A new study finds that COVID-19 had minimal mental health impacts on the population, consistent with other research suggesting that people are resilient.

An analysis of mortality data shows that COVID-19 ranks as a leading cause of death among children and teens.