The U.S. has now tallied more than 24.2 million cases and more than 400,000 deaths.
A new coronavirus variant has been found in multiple California outbreaks, but scientists aren't yet sure whether it's more transmissible than other strains.
One day, the pandemic will end. Scientists don't know how that finale will play out but a new model offers a teaser.
A little over a year after the World Health Organization first announced a string of mysterious illnesses, the agency will travel to their point of origin to investigate how it all started.
A key mutation increase the ability of the virus to bind to human cells, but Pfizer's vaccine still works against it.
A coronavirus variant identified in South Africa may not be as vulnerable to COVID-19 vaccines as other strains, some scientists say.
To protect endangered black-footed ferrets from COVID-19, scientists in Colorado have injected a major captive breeding population with an experimental vaccine.