NEW YORK (AP) — The omicron variant of COVID-19, which had been undetected in the U.S. before the middle of this week, had been discovered in at least five states by the end of Thursday, showing yet again how mutations of the virus can circumnavigate the globe with speed and ease.

World Health Organization officials said Friday that measures used to counter the delta variant should remain the foundation for fighting the coronavirus pandemic, even in the face of the new omicron version of the virus, while acknowledging that the travel restrictions imposed by some countries may buy time.

While about three dozen countries worldwide have reported omicron infections, including India on Thursday, the numbers so far are small outside of South Africa, which is facing a rapid rise in COVID-19 cases and where the new variant may be becoming dominant.

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