U.S. tightens travel rules as more countries secure borders to quell Omicron

U.S. tightens travel rules as more countries secure borders to quell Omicron  Reuters Covid News: U.S. to Tighten Testing for Travelers

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Moderna CEO warns COVID-19 shots less effective against Omicron, spooks markets

Moderna CEO warns COVID-19 shots less effective against Omicron, spooks markets  Reuters Stock futures tumble anew as Moderna CEO predicts existing

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Stocks slip, havens rally as new COVID-19 variant spooks investors

Stocks slip, havens rally as new COVID-19 variant spooks investors  Reuters Dow futures plunge 400 points amid fears of new Covid

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