No cases of new omicron Covid variant in the U.S. so far, CDC says

The Pfizer-BioNTech Covid-19 vaccine sits on a table at National Jewish Health in Denver, Colorado.

There are no cases of the new omicron Covid variant in the US, according to the CDC.

No cases of this variant have been found in the US to date, according to the statement by the Centers for Disease Control and Prevention.

The U.S. variant surveillance system has reliably detected new variant in this country. If Omicron emerges in the U.S., we expect it to be identified quickly.

The strain was first detected in South Africa and raised concerns due to the rapid rise in the number of coronaviruses cases in the country.

The UN health agency only designates Covid strains as a variant of concern when they are more transmissible, more virulent or more able to evade vaccines.

The World Health Organization said that the variant has a large number of defects. Preliminary evidence shows an increased risk of reinfection with this variant. The number of cases of this variant appears to be increasing.

The U.S. imposed travel restrictions for people from other countries. Senior Biden administration officials said that the restrictions will begin from Monday.

The countries that were included in the ban were:

There was no word on how long the restrictions will be in place.

CNBC's Christina Wilkie contributed to the report.