Travellers from European countries who have been immunized against COVID-19 with vaccines authorized by the World Health Organization will be allowed to enter the United States

"Travellers from European countries who have been immunized against COVID-19 with vaccines authorized by the World Health Organization will be allowed to enter the United States". [schengenvisainfo] It's all positive. https://www.schengenvisainfo.com/news/us-will-permit-entry-for-european-travellers-inoculated-with-who-approved-vaccines/