‘Stealth Omicron’ was just overtaken in the U.S. by a new subvariant that evades immunity
“Stealth Omicron” has been dethroned—twice now. The subvariant, nicknamed for its ability to evade detection on PCR tests, was dominant in the U.S. until last month, when it was overtaken by another Omicron subvariant, BA.2.12.1. Last week, it got passed yet again. The new dominant Omicron subvariant, BA.5,...