Experts at the World Health Organization have named XBB.1.5 — also known as the "Kraken" strain — the most infectious version ...

CDC data shows the bivalent COVID vaccines protect against the omicron variant known as XBB and its subvariant XBB.1.5.

Updated Covid boosters cut the infection risk from XBB.1.5 subvariant by nearly half, CDC finds The report provides the first ...

XBB.1.5 is a spinoff of XBB, a subvariant of omicron that health officials worldwide have been warning about since the fall.

The latest COVID variant of concern, XBB.1.5, continues to rise but still makes up a minority of new COVID-19 infections across the country, the Centers for Disease Control and Prevention ...

The CDC has lowered its estimate of omicron subvariant XBB.1.5's prevalence in the U.S., now saying the highly transmissible strain accounts for about 28 percent of COVID-19 cases. The CDC first ...

The CDC has published real-world data showing the omicron booster cuts the risk of mid illness from the fast spreading XBB ...

A booster dose provided at least 3 months of protection against symptomatic XBB and XBB.1.5 infections in seniors who had ...