Omicron Top U.S. Strain; Singapore Finds Cluster: Virus Update

Omicron accounted for 73% of all Covid-19 infections last week in the U.S., according to Centers for Disease Control and Prevention data. Almost all of the remaining cases were of the delta strain.
https://www.bloomberg.com/news/articles/2021-12-20/omicron-top-u-s-strain-singapore-finds-cluster-virus-update?utm_source=dlvr.it&utm_medium=blogger