Since it was first identified in November, BA.2 has been spreading around the globe, driving new surges in parts of Asia and Europe. It's now the dominant coronavirus versionIt was given the “stealth” nickname because it looks like the earlier delta variant on certain PCR tests, says Kristen Coleman at the University of Maryland School of Public Health. The original omicron, by contrast, is easy to differentiate from delta because of a genetic quirk.
Health officials also are tracking other variants including XE — a combination of BA.2 and BA.1, the original omicron — that was first identified in January in the United Kingdom. The World Health Organization is keeping tabs on XE but has not yet deemed it a variant of concern or interest.The AP is answering your questions about the coronavirus in this series. Submit them at: FactCheck@AP.org.
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