Health

As schools, universities and businesses struggle to reopen without the coronavirus testing they need to curb outbreaks, the Trump administration’s testing czar testified to Congress Friday that it was currently impossible to get all tests back within three days.

The testing czar, Adm. Brett P. Giroir, told lawmakers that getting all coronavirus tests back between 48 and 72 hours, which many health officials have said is critical, “is not a possible benchmark we can achieve today, given the demand and the supply.”

ROME — When the coronavirus erupted in the West, Italy was the nightmarish epicenter, a place to avoid at all costs and a shorthand in the United States and much of Europe for uncontrolled contagion.