http://www.newsweek.com/texas-hospital-reports-50-mu-covid-cases-delta-dominance-continues-houston-methodist-1626952

Roughly 50 cases of the Mu variant of COVID have been detected in a Texas hospital, according to local news outlets.

It's the newest variant to be dubbed a variant of interest (VOI) by the World Health Organization (WHO), which updated its VOI list last week and officially gave Mu its name. The variant is also known as B.1.621.