By David Shepardson WASHINGTON (Reuters) -The U.S. is moving to require that all air travelers entering the country show a negative COVID-19 test performed within one day of departure in response to concerns about a new coronavirus variant, the Centers for Disease Control and Prevention (CDC) said late on Tuesday. Currently, vaccinated international air travelers can present a negative test result obtained within three days from their point of departure. Nearly all foreign nationals must be vaccinated to enter the United States. Unvaccinated travelers currently must get a negative COVID-19 tes…

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