COVID is once again climbing to troubling levels in California — a worrying trend as health officials attempt to navigate a ...

The new COVID-19 strainalso known as XFG—is a "variant under monitoring" by the World Health Organization (WHO).

The new strain is driving a recent rise in cases across several states, including California. The variant, a hybrid of two ...

California reports a surge in COVID cases as the Stratus variant spreads, now the dominant strain in the U.S., health ...

If you already had Omicron, do you still need the new COVID vaccine booster? Here's what the experts say.

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Two subvariants that have emerged from the soup of Omicron offspring are among the most adept at evading immunity. They appear poised to become dominant in the U.S. and could fuel a new surge.

Omicron is considered a milder coronavirus, but scientists aren’t so sure Omicron virus particles replicating inside an infected cell in an image from a transmission electron microscope.