CDC headquarters in Atlanta

Elijah Nouvelage | Bloomberg via Getty Images

Officials with the Centers for Disease Control and Prevention said Wednesday that a new strain of Covid-19 now circulating in the United States could further strain hospitals already overwhelmed with coronavirus patients.

Colorado health officials announced Tuesday that they had discovered the first known case of the new and contagious strain of the virus, which was first discovered in the UK. A second separate new strain, identified for the first time in South Africa, could already be in circulation in the US, CDC officials said.

“As the variants spread faster, they could lead to more cases and put even more strain on our already stressed health systems,” said Dr. Henry Walke, the agency’s Covid Incident Manager, in a conference call with reporters.

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