The spike in Covid cases is the highest number reported in the U.K. in three months. Overall cases are up 18 percent in just the past week. Officials there are investigating the delta plus mutation, while Dr. Anthony Fauci says there’s no cause for alarm in the U.S. at this point. » Subscribe to NBC News:
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U.K. Reports More Than 50,000 New Covid Cases, Officials Investigate New Mutation
