NewYork-Presbyterian performed more than 500 tests for the novel coronavirus Saturday, and 50% came out positive.

"That's very high," Chief Operating Officer Dr. Laura L. Forese said in a leadership briefing Sunday.

Forese said the hospitals had 558 Covid-19 inpatients, and about 1 in 5 are receiving ICU care.

That number "is a snapshot. It's changing probably as I'm speaking to you today," she said. "We have many more who have been sent home, either Covid-positive tested, or presumed to have that."

Some context: Like other health care systems around the country, NewYork-Presbyterian is not able to test every patient for Covid-19, citing a shortage of swab kits.

Of nearly 30,000 cases in the United States, more than 15,000 are in New York state, including more than 9,000 in New York City.