U.S. stock benchmarks headed lower Tuesday morning, giving up some of Monday’s gains, amid fresh concerns that the new omicron strain of coronavirus is more resistant to the current batch of vaccines. Moderna Chief Executive Stéphane Bancel told theFinancial Times in an interview. The Dow Jones Industrial Average was down 0.8%, the S&P 500 index declined 0.6% at 4,627, while the Nasdaq Composite Index retreated 0.4% at 15,717. The 10-year benchmark Treasury note was yielding 1.44%, down from 1.529% on Monday at 3 p.m. Eastern Time.

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