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WATCH: White House task force urges greater vigilance against COVID-19 variants

WASHINGTON — The head of the CDC says doctors and public health officials should approach each new case of the coronavirus as if it is a mutation.

Watch the briefing stream live in the video player above.

“I do believe we should be treating every case as it if it’s a variant during this pandemic right now,” Dr. Rochelle Walensky said during a White House coronavirus briefing.

Two cases of the variant that originated in South Africa has been detected in South Carolina. There is concern if it continues to spread, it could become dominant in a few months.

Walensky says contact tracing efforts in the U.S. are not yet up to the task of containing the potential breakout of new mutations.

WATCH: Biden’s pick to lead the CDC: ‘We have a lot of hard work in front of us’

White House coronavirus adviser Andy Slavitt says Congress must move quickly to pass President Joe Biden’s coronavirus relief bill, which contains money to expand efforts to track and identify mutations.