COVID-19 test

File / The Outlook

A new coronavirus "variant of concern" referred to as the Greek letter Omicron by the World Health Organization (WHO) Friday has prompted new travel restrictions from several southern African nations to the United States.

The Omicron variant, reported to the WHO from South Africa Tuesday, is described by the WHO as having "a large number of mutations, some of which are concerning," and preliminary evidence "suggests an increased risk of reinfection with this variant, as compared to other VOCs [variants of concern]" such as the Delta variant.