Among those testing positive: ABC News correspondent Jonathan Karl, ABC News President Kim Godwin and Secretary of State Antony Blinken. The State Department said Blinken, who is vaccinated, is experiencing mild symptoms and quarantining at home.

During the event, Karl sat next to reality-show starlet Kim Kardashian and her boyfriend, “Saturday Night Live” cast member Pete Davidson. Karl also shook hands with Biden, who limited his time in the subterranean ballroom to about an hour.

Employees of CNN, NBC News, CBS News, Politico, Voice of America, Puck News and The Washington Post also tested positive, according to social media posts, texts, emails and news accounts.