http://www.newsweek.com/mu-covid-variant-vaccine-resistant-most-prevelant-us-states-alaska-1626322

The Mu variant of COVID is particularly prevalent in certain states of the U.S. and at least one case has been detected in every state except one.

As of September 4, the state with the highest proportion of Mu cases was Alaska, where 146 Mu cases have been sequenced, according to the Outbreak.info variant tracker. This translates to a prevalence of about four percent.