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Scientists investigating the virus have said that antibodies last up to ten months based on SARS-CoV-2 infection. This period comes as longer than other studies that estimate six to eight months once infected.
United States President Joe Biden's administration announced new policies that would implement tighter restrictions on travelers to the U.S. The new rules require proof of full vaccination or otherwise a negative test result within three days of travel for foreign visitors and one day for Americans and permanent residents.