Samantha Vinograd is a CNN national security analyst. She is a senior adviser at the University of Delaware’s Biden Institute, which is not affiliated with the Biden campaign. Vinograd served on President Barack Obama’s National Security Council from 2009 to 2013 and at the Treasury Department under President George W. Bush. Follow her @sam_vinograd. The views expressed in this commentary are her own. View more opinion articles on CNN. (CNN)Donald Trump’s coronavirus test came back negative after his exposure to an infected Brazilian official. But that doesn’t guarantee a clean Covid-19 bill of health going forward. Because of the President’s ongoing contact with countless numbers of people — including White House staff — he should be regularly screened and tested as appropriate. Hopefully, he will now start following US Centers for Disease Control and Prevention guidelines to avoid turning the White House into a hot spot for infection. The White House indeed showed some signs of added caution this weekend.On Sunday, a doctor took the temperatures of the coronavirus task force members before they met and on Saturday journalists had to be checked for fever minutes before entering the briefing room for Trump’s press conference. It’s unclear if this new


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