With the CDC estimating that the delta variant accounts for more than 90% of new COVID cases in the U.S., scientists are still learning more about what makes this variant different from prior versions ...

ATLANTA, Ga. — The delta variant that’s now the dominant strain of coronavirus in the U.S. appears to be as transmissible as chickenpox, according to an internal document from the Centers for Disease ...

SEOUL--South Korea’s prime minister on Wednesday called on people not to panic about a major increase in coronavirus infections as new daily cases surged past 170,000 for the first time.

Victoria’s vaccination approach during the Delta outbreak of the covid pandemic prevented over 300,000 infections, 33,000 ...