A new COVID-19 variant called B.1621 or mu by the World Health Organization is being monitored by scientists. While this variant is making news, it is not the dominant strain in the U.S. or elsewhere, says Dr. John O'Horo, a Mayo Clinic infectious diseases physician.

"The delta variant is really the predominant strain everywhere at this point. And while it is important that scientists and public health officials keep an eye on this, we're still in a space right now where the mu variant is something to keep an eye on for the future rather than a concern."


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