The Delta variant, also referred to as a "double mutant" because it carries two mutations, is 55 per cent more transmissible ...

Several COVID-19 variants are acting uniquely enough to qualify as a distinct strain. And you might have heard about one on ...

CHICAGO (WLS) -- Work being done inside a UIC lab will hopefully lead to more information about various strains of COVID-19, including the Delta variant. "What we want to know is how fast these ...

The delta variant of the coronavirus is the "greatest threat" to eliminating Covid-19 in the United States, the nation's leading infectious disease expert Dr. Anthony Fauci said Tuesday. The variant, ...

NEW YORK, N.Y. — Pfizer announced Wednesday that data shows a third dose of its COVID-19 vaccine can “strongly” boost protection against the highly transmissible delta variant. The pharmaceutical and ...

Add Yahoo as a preferred source to see more of our stories on Google. Getty Images An alleged warning has spread online for years about a supposed "new COVID-Omicron XBB variant" — a new strain of the ...

Differing strains of the coronavirus continue to appear around the world and a new COVID-19 variant, the so-called "Delta" variant, has health experts concerned. The variant, otherwise known as B.1617 ...

UNITED STATES — The delta variant of COVID-19 is becoming even more dominant throughout the country. As numbers are rising, so is the amount of mixed messaging. Health professionals say getting the ...

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 ...