In August, the Transportation Security Administration extended its US federal transportation mask mandate through January 18 “to minimize the spread of Covid-19 on public transportation” due to concerns at that time over the Delta variant.
Scientists are working to determine how transmissible the Omicron variant is, how sick it makes people and how well the current vaccines work against it. Until more information is available, the United States has restricted travel from South Africa and seven other countries.
This story has been updated with additional information Wednesday.
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