As the more contagious Delta variant of the coronavirus sweeps across the United States, doctors are concerned it could create another spike in Covid-19 cases in the fall, especially in areas where ...

The Delta variant of Covid-19 is more contagious than other lineages, and is spreading rapidly in under-vaccinated populations. While vaccination is a matter of choice for adults, many children -- ...

Brett Sutton says it’s of ‘significant concern’ and it has international authorities worried - but what is the dreaded new ...

Moderna on Tuesday released preliminary data indicating its vaccine is likely to hold up against several variants of concern, including the Delta variant, which is predicted to become the dominant ...

The more the virus spreads, the more it has "ample opportunity" to mutate, Dr. Anthony Fauci told anchor "GMA" George Stephanopoulos Thursday. The delta variant is fueling the COVID-19 surge in the ...