http://www.newsweek.com/where-did-mu-variant-originate-covid-vaccines-world-health-organization-1627469

Researchers are keeping an eye on the Mu variant of COVID which has been in the U.S. for several months. The variant, also known as B.1.621, was designated as a Variant of Interest (VOI) by the World Health Organization on August 30 this year.

Since then it has made numerous headlines with cases reported in every U.S. state except for Nebraska, according to Outbreak.info, which collects virus sequencing data from the GISAID database.