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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S.Africa detects new COVID-19 variant, implications not yet clear

S.Africa detects new COVID-19 variant, implications not yet clear  Reuters New Coronavirus Variant a ‘Serious Concern’ in South Africa  Bloomberg WHO calls

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