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A handful of companies, including tech giant Facebook and credit card firm Discover, have publicly said that they will not require vaccines for employees -- though they will strongly encourage them.

Delta’s announcement comes months after United Airlines’ CEO Scott Kirby told employees at a town hall in January that he wants to make vaccines mandatory but worried about the logistics of implementing a requirement.

\"I don’t think United will get away with and can realistically be the only company that requires vaccines and makes them mandatory,\" Kirby told employees at the time. \"We need some others to show leadership.\"

As of Monday, United told ABC News that it has no news on a new vaccination policy for workers.

Nearly 50% of the U.S. population has received at least one dose of a coronavirus vaccine, and 37% are fully vaccinated as of Monday, according to data from the Centers for Disease Control and Prevention.

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