Buildings are getting tested for coronavirus, too. Research teams in Oregon are conducting real-time coronavirus tests on ventilation systems in buildings that could be essential for returning to the office or school.

• Plus, small businesses are facing an existential threat.
• And, in a rare move, the Trump administration rescinds a recent guideline that would have sent hundreds of thousands of international students packing.

Guests: Axios’ Joann Muller, Dion Rabouin, and Mike Allen.

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